<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<!--
| This is the configuration file for Maven. It can be specified at two levels:
|
| 1. User Level. This settings.xml file provides configuration for a single user,
| and is normally provided in ${user.home}/.m2/settings.xml.
|
| NOTE: This location can be overridden with the CLI option:
|
| -s /path/to/user/settings.xml
|
| 2. Global Level. This settings.xml file provides configuration for all Maven
| users on a machine (assuming they're all using the same Maven
| installation). It's normally provided in
| ${maven.conf}/settings.xml.
|
| NOTE: This location can be overridden with the CLI option:
|
| -gs /path/to/global/settings.xml
|
| The sections in this sample file are intended to give you a running start at
| getting the most out of your Maven installation. Where appropriate, the default
| values (values used when the setting is not specified) are provided.
|
|-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
<!-- localRepository
| The path to the local repository maven will use to store artifacts.
|
| Default: ${user.home}/.m2/repository
<localRepository>/path/to/local/repo</localRepository>
-->
<!-- Create your own download jar package address
<localRepository>D:\mavens\LocalWarehouse</localRepository>-->
<!-- The default address for downloading jar packages-->
<localRepository>F:\Maven\repository</localRepository>
<!-- interactiveMode
| This will determine whether maven prompts you when it needs input. If set to false,
| maven will use a sensible default value, perhaps based on some other setting, for
| the parameter in question.
|
| Default: true
<interactiveMode>true</interactiveMode>
-->
<!-- offline
| Determines whether maven should attempt to connect to the network when executing a build.
| This will have an effect on artifact downloads, artifact deployment, and others.
|
| Default: false
<offline>false</offline>
-->
<!-- pluginGroups
| This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.
| when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers
| "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.
|-->
<pluginGroups>
<!-- pluginGroup
| Specifies a further group identifier to use for plugin lookup.
<pluginGroup>com.your.plugins</pluginGroup>
-->
</pluginGroups>
<!-- proxies
| This is a list of proxies which can be used on this machine to connect to the network.
| Unless otherwise specified (by system property or command-line switch), the first proxy
| specification in this list marked as active will be used.
|-->
<proxies>
<!-- proxy
| Specification for one proxy, to be used in connecting to the network.
|
<proxy>
<id>optional</id>
<active>true</active>
<protocol>http</protocol>
<username>proxyuser</username>
<password>proxypass</password>
<host>proxy.host.net</host>
<port>80</port>
<nonProxyHosts>local.net|some.host.com</nonProxyHosts>
</proxy>
-->
</proxies>
<!-- servers
| This is a list of authentication profiles, keyed by the server-id used within the system.
| Authentication profiles can be used whenever maven must make a connection to a remote server.
|-->
<servers>
<!-- server
| Specifies the authentication information to use when connecting to a particular server, identified by
| a unique name within the system (referred to by the 'id' attribute below).
|
| NOTE: You should either specify username/password OR privateKey/passphrase, since these pairings are
| used together.
|
<server>
<id>deploymentRepo</id>
<username>repouser</username>
<password>repopwd</password>
</server>
-->
<!-- Another sample, using keys to authenticate.
<server>
<id>siteServer</id>
<privateKey>/path/to/private/key</privateKey>
<passphrase>optional; leave empty if not used.</passphrase>
</server>
-->
</servers>
<!-- mirrors
| This is a list of mirrors to be used in downloading artifacts from remote repositories.
|
| It works like this: a POM may declare a repository to use in resolving certain artifacts.
| However, this repository may have problems with heavy traffic at times, so people have mirrored
| it to several places.
|
| That repository definition will have a unique id, so we can create a mirror reference for that
| repository, to be used as an alternate download site. The mirror site will be the preferred
| server for that repository.
|-->
<mirrors>
<!-- maven official mirror -->
<!--
<mirror>
<id>mirrorId</id>
<mirrorOf>central</mirrorOf>
<name>Human Readable Name </name>
<url>http://repo1.maven.org/maven2/</url>
</mirror><-->
<!-- another mirror -->
<!--
<mirror>
<id>alimaven</id>
<name>aliyun maven</name>
<url>http://central.maven.org/maven2</url>
<mirrorOf>central</mirrorOf>
</mirror>
<mirror>
<id>Central</id>
<url>http://repo1.maven.org/maven2</url>
<mirrorOf>central</mirrorOf>
</mirror>
<mirror>
<id>junit</id>
<name>junit Address</name>
<url>http://jcenter.bintray.com/</url>
<mirrorOf>central</mirrorOf>
</mirror>
-->
<mirror>
<id>alimaven</id>
<name>aliyun maven</name>
<url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
<mirrorOf>central</mirrorOf>
</mirror>
</mirrors>
<!-- profiles
| This is a list of profiles which can be activated in a variety of ways, and which can modify
| the build process. Profiles provided in the settings.xml are intended to provide local machine-
| specific paths and repository locations which allow the build to work in the local environment.
|
| For example, if you have an integration testing plugin - like cactus - that needs to know where
| your Tomcat instance is installed, you can provide a variable here such that the variable is
| dereferenced during the build process to configure the cactus plugin.
|
| As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles
| section of this document (settings.xml) - will be discussed later. Another way essentially
| relies on the detection of a system property, either matching a particular value for the property,
| or merely testing its existence. Profiles can also be activated by JDK version prefix, where a
| value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.
| Finally, the list of active profiles can be specified directly from the command line.
|
| NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact
| repositories, plugin repositories, and free-form properties to be used as configuration
| variables for plugins in the POM.
|
|-->
<profiles>
<!-- profile
| Specifies a set of introductions to the build process, to be activated using one or more of the
| mechanisms described above. For inheritance purposes, and to activate profiles via <activatedProfiles/>
| or the command line, profiles have to have an ID that is unique.
|
| An encouraged best practice for profile identification is to use a consistent naming convention
| for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.
| This will make it more intuitive to understand what the set of introduced profiles is attempting
| to accomplish, particularly when you only have a list of profile id's for debug.
|
| This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.
<profile>
<id>jdk-1.4</id>
<activation>
<jdk>1.4</jdk>
</activation>
<repositories>
<repository>
<id>jdk14</id>
<name>Repository for JDK 1.4 builds</name>
<url>http://www.myhost.com/maven/jdk14</url>
<layout>default</layout>
<snapshotPolicy>always</snapshotPolicy>
</repository>
</repositories>
</profile>
-->
<!--
| Here is another profile, activated by the system property 'target-env' with a value of 'dev',
| which provides a specific path to the Tomcat instance. To use this, your plugin configuration
| might hypothetically look like:
|
| ...
| <plugin>
| <groupId>org.myco.myplugins</groupId>
| <artifactId>myplugin</artifactId>
|
| <configuration>
| <tomcatLocation>${tomcatPath}</tomcatLocation>
| </configuration>
| </plugin>
| ...
|
| NOTE: If you just wanted to inject this configuration whenever someone set 'target-env' to
| anything, you could just leave off the <value/> inside the activation-property.
|
<profile>
<id>env-dev</id>
<activation>
<property>
<name>target-env</name>
<value>dev</value>
</property>
</activation>
<properties>
<tomcatPath>/path/to/tomcat/instance</tomcatPath>
</properties>
</profile>
-->
</profiles>
<!-- activeProfiles
| List of profiles that are active for all builds.
|
<activeProfiles>
<activeProfile>alwaysActiveProfile</activeProfile>
<activeProfile>anotherAlwaysActiveProfile</activeProfile>
</activeProfiles>
-->
</settings>
Category Archives: JAVA
Spring MVC uses Ajax to submit requests asynchronously to complete login
Submit the form asynchronously with Ajax, log in and return the JSON data.
1、 Effect
2、 Configuration
springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.it.springmvc" />
<mvc:annotation-driven></mvc:annotation-driven>
<bean id="jspViewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<mvc:default-servlet-handler/>
</beans>web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"
version="3.0">
<display-name>springMVC</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>example</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>WEB-INF/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>example</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>Controller
PersonController.java
package com.it.springmvc.controller;
import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.it.springmvc.entity.Person;
@Controller
public class PersonController {
@RequestMapping(value="/toLogin",method=RequestMethod.GET)
public String toLogin(){
return "login";
}
@RequestMapping(value="/login",method=RequestMethod.POST)
public String login(Person person){
if(10025==person.getPid()&&"123".equals(person.getPwd())){
return "redirect:queryAll";
}else{
return "login";
}
}
@RequestMapping(value="/queryAll",method=RequestMethod.GET)
public ModelAndView queryAll(){
ModelAndView mav=new ModelAndView("show");
List<Person> list=new ArrayList<Person>();
list.add(new Person(10025, "tom", "123"));
list.add(new Person(10026, "jakson", "123"));
list.add(new Person(10027, "nikly", "123"));
mav.addObject("list", list);
return mav;
}
@RequestMapping("/ajax")
@ResponseBody
public Object ajax(Person person){
System.out.println(person.getPid()+person.getPwd());
if(10025==person.getPid()&&"123".equals(person.getPwd())){
return "{\"flag\":true}";
}else{
return "{\"flag\":false}";
}
}
}
1.2.2.
Index.jsp
<body>
<%
response.sendRedirect("toLogin");
%>
</body>login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<script type="text/javascript" src="js/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
$(function(){
$("#sub").click(function(){
$.post("ajax",$("form").serialize(),function(data){
//alert(data.flag);
if(data.flag){
alert("Login success");
location.href="queryAll";
}else{
alert("please recheck your usename and password");
}
},'json');
})
})
</script>
<body>
<form method="post">
<table border="1" width="300px">
<tr>
<td>usename</td>
<td><input type="text" name="pid"/></td>
</tr>
<tr>
<td>password</td>
<td><input type="password" name="pwd"/></td>
</tr>
<tr>
<!-- <td colspan="2"><input type="submit" value="submit"/></td> -->
<td colspan="2"><input type="button" value="submit" id="sub"/></td>
</tr>
</table>
</form>
</body>
</html>show.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<a href="toAdd">Add</a>
<table border="1" width="400px">
<tr>
<th>NUM</th>
<th>name</th>
<th>password</th>
<th>Act</th>
</tr>
<c:forEach var="person" items="${list}">
<tr>
<td>${person.pid }</td>
<td>${person.pname }</td>
<td>${person.pwd }</td>
<td><a href="">Update</a></td>
<td><a href="">DEL</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>[Solved] Java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory
Leave a reply
1. The startup project reported this error, and the corresponding package was not found, so you need to download the package from the remote warehouse to the local warehouse.
1 [INFO] Scanning for projects... 2 [INFO] 3 [INFO] -------------------< com.taotao:taotao-manager-web >-------------------- 4 [INFO] Building taotao-manager-web 0.0.1-SNAPSHOT 5 [INFO] --------------------------------[ war ]--------------------------------- 6 [INFO] 7 [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ taotao-manager-web --- 8 [INFO] Deleting D:\eclipse\workspace_taotao\taotao-manager-web\target 9 [INFO] 10 [INFO] >>> tomcat7-maven-plugin:2.2:run (default-cli) > process-classes @ taotao-manager-web >>> 11 [INFO] 12 [INFO] --- maven-resources-plugin:2.7:resources (default-resources) @ taotao-manager-web --- 13 [INFO] Using 'UTF-8' encoding to copy filtered resources. 14 [INFO] Copying 2 resources 15 [INFO] 16 [INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ taotao-manager-web --- 17 [INFO] Changes detected - recompiling the module! 18 [INFO] Compiling 1 source file to D:\eclipse\workspace_taotao\taotao-manager-web\target\classes 19 [INFO] 20 [INFO] <<< tomcat7-maven-plugin:2.2:run (default-cli) < process-classes @ taotao-manager-web <<< 21 [INFO] 22 [INFO] 23 [INFO] --- tomcat7-maven-plugin:2.2:run (default-cli) @ taotao-manager-web --- 24 [INFO] Running war on http://localhost:8081/ 25 [INFO] Creating Tomcat server configuration at D:\eclipse\workspace_taotao\taotao - manager - web\target\tomcat 26 [ INFO ] create webapp with contextPath : 27 August 03 , 2019 9 : 06 : 47 AM org . apache . coyote . AbstractProtocol init 28 Information : Initializing ProtocolHandler [ " Bio-8081-HTTP " ] 29 Bayue 03 , 2019 9 : 06 : 47Morning ORG . The Apache . Catalina . Core . StandardService startInternal 30 Information : Starting Tomcat Service 31 Bayue 03 , 2019 9 : 06 : 47 am ORG . The Apache . Catalina . Core . StandardEngine startInternal 32 Information : Starting Servlet Engine : the Apache Tomcat / 7.0 . 47 33 August 03 , 2019 9:06:57 AM org.apache.catalina.core.ApplicationContext log 34 Message: No Spring WebApplicationInitializer types detected on classpath 35 log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.StandardServletEnvironment). 36 log4j:WARN Please initialize the log4j system properly. 37 log4j : WARN See http : / / logging . Apache . Org / log4j / 1.2 / faq . Html#noconfig for more info . 38 August 03 , 2019 9 : 06 : 58 AM org . apache . Catalina . Core . ApplicationContext log 39 information : Initializing Spring FrameworkServlet'taotao -manager-web' 40 August 03 , 2019 9 : 09 : 33 am org . apache . Catalina . Core . ApplicationContext log 41 serious : StandardWrapper . Throwable 42 java . Lang . NoClassDefFoundError : org / apache / commons / fileupload / FileItemFactory 43 at java . Lang . Class .getDeclaredMethods0(Native Method) 44 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 45 at java.lang.Class.getDeclaredMethods(Class.java:1975) 46 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 47 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 48 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 49 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 50 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 51 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 52 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 53 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 54 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 55 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 56 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 57 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 58 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 59 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 60 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 61 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 62 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 63 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 64 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 65 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 66 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 67 at javax.servlet.GenericServlet.init(GenericServlet.java:160) 68 at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) 69 at org.apache.catalina.core.StandardWrapper.loadServlet ( StandardWrapper . java : 1193 ) 70 at org . apache . catalina . core . StandardWrapper . load ( StandardWrapper . java : 1088 ) 71 at org . apache . catalina . core . StandardContext . loadOnStartup ( StandardContext . java : 5176 ) 72 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460) 73 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 74 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 75 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 76 at java.util.concurrent.FutureTask.run(FutureTask.java:266) 77 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 78 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 79 at java.lang.Thread.run(Thread.java:748) 80 Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 81 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 82 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 83 ... 37 more 84 85 Agu 03, 2019 9:09:33 AM org.apache.catalina.core.StandardContext loadOnStartup 86 Warning: Servlet threw load() exception 87 java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 88 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 89 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 90 at java.lang.Class.getDeclaredMethods0(Native Method) 91 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 92 at java.lang.Class.getDeclaredMethods(Class.java:1975) 93 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 94 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 95 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 96 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 97 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 98 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 99 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 100 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 101 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 102 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 103 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 104 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 105 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 106 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 107 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 108 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 109 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 110 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 111 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 112 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 113 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136 ) 114 at javax . servlet . GenericServlet . init ( GenericServlet . java : 160 ) 115 at org . apache . catalina . core . StandardWrapper . initServlet ( StandardWrapper . java : 1280 ) 116 at org . apache . catalina . core . StandardWrapper . loadServlet(StandardWrapper.java:1193) 117 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) 118 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176) 119 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460) 120 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 121 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 122 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 123 at java.util.concurrent.FutureTask.run(FutureTask.java:266) 124 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 125 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 126 at java.lang.Thread.run(Thread.java:748) 127 128 Agu 03, 2019 9:09: 33 am org . Apache . Coyote . AbstractProtocol start 129 Information : Starting ProtocolHandler [ "http-bio-8081" ] 130 August 03 , 2019 9 : 11 : 26 am org . apache . Catalina . Core . ApplicationContext log 131 information : Initializing Spring FrameworkServlet'taotao -manager-web' 132 August 03 , 2019 9:11:26 AM org.apache.catalina.core.ApplicationContext log 133 Warning: StandardWrapper.Throwable 134 java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory 135 at java.lang.Class.getDeclaredMethods0(Native Method) 136 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 137 at java.lang.Class.getDeclaredMethods(Class.java:1975) 138 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 139 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 140 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 141 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 142 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 143 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 144 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 145 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 146 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 147 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 148 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 149 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 150 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 151 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 152 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 153 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 154 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 155 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 156 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 157 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 158 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 159 at javax . servlet . GenericServlet . init ( GenericServlet . java : 160 ) 160 at org . apache . catalina . core . StandardWrapper . initServlet ( StandardWrapper . java : 1280 ) 161 at org . apache . catalina . core . StandardWrapper . loadServlet (StandardWrapper.java:1193) 162 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865) 163 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136) 164 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 165 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 166 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 167 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 168 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 169 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 170 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 171 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) 172 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) 173 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 174 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 175 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 176 at java.lang.Thread.run(Thread.java:748) 177 Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 178 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 179 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 180 ... 42 more 181 182 Agu 03, 2019 9:11:26 AM org.apache.catalina.core.StandardWrapperValve invoke 183 WANING: Allocate exception for servlet taotao-manager-web 184 java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 185 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 186 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 187 at java.lang.Class.getDeclaredMethods0(Native Method) 188 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 189 at java.lang.Class.getDeclaredMethods(Class.java:1975) 190 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 191 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 192 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 193 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 194 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 195 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 196 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 197 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 198 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 199 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 200 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 201 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 202 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 203 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 204 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 205 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 206 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 207 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 208 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 209 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 210 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 211 at javax.servlet.GenericServlet.init(GenericServlet.java:160) 212 at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) 213 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) 214 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865) 215 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136) 216 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 217 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 218 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 219 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 220 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 221 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 222 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 223 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) 224 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) 225 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 226 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 227 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 228 at java.lang.Thread.run(Thread.java: 748 ) 229 230 August 03 , 2019 9 : 11 : 27 AM org . apache . Catalina . Core . ApplicationContext log 231 Information : Initializing Spring FrameworkServlet'taotao -manager-web' 232 August 03 , 2019 9 : 11 : 27 AM org . Apache . Catalina . Core . ApplicationContext log 233 WANING: StandardWrapper.Throwable 234 java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory 235 at java.lang.Class.getDeclaredMethods0(Native Method) 236 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 237 at java.lang.Class.getDeclaredMethods(Class.java:1975) 238 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 239 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 240 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 241 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 242 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 243 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 244 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 245 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 246 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 247 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 248 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 249 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 250 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 251 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 252 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 253 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 254 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 255 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 256 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 257 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 258 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 259 at javax.servlet.GenericServlet.init(GenericServlet.java:160) 260 at org . apache . catalina . core . StandardWrapper . initServlet ( StandardWrapper . java : 1280 ) 261 at org . apache . catalina . core . StandardWrapper . loadServlet ( StandardWrapper . java : 1193 ) 262 at org . apache . catalina . core . StandardWrapper.allocate(StandardWrapper.java:865) 263 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136) 264 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 265 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 266 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 267 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 268 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 269 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 270 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 271 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) 272 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) 273 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 274 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 275 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 276 at java.lang.Thread.run(Thread.java:748) 277 Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 278 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 279 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 280 ... 42 more 281 282 Agu 03, 2019 9:11:27 AM org.apache.catalina.core.StandardWrapperValve invoke 283 WANING: Allocate exception for servlet taotao-manager-web 284 java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory 285 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 286 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 287 at java.lang.Class.getDeclaredMethods0(Native Method) 288 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 289 at java.lang.Class.getDeclaredMethods(Class.java:1975) 290 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:609) 291 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:521) 292 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:507) 293 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:241) 294 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1069) 295 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 296 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 297 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 298 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 299 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 300 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 301 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 302 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 303 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 304 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 305 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) 306 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) 307 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) 308 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) 309 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) 310 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 311 at javax.servlet . GenericServlet . init ( GenericServlet . java : 160 ) 312 at org . apache . catalina . core . StandardWrapper . initServlet ( StandardWrapper . java : 1280 ) 313 at org . apache . catalina . core . StandardWrapper . loadServlet ( StandardWrapper . java :1193) 314 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865) 315 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136) 316 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 317 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 318 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 319 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 320 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 321 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 322 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 323 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) 324 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) 325 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 326 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 327 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 328 at java.lang.Thread.run(Thread.java:748)
Just add dependencies.
1 <dependencies> 2 <!-- File upload component --> 3 <dependency> 4 <groupId>commons-fileupload</groupId> 5 <artifactId>commons-fileupload</artifactId> 6 </dependency> 7 </dependencies>
[Solved] error:could not open…….error a fatal exception……..
Modify the eclipse.ini , modify the location of the virtual machine, and change all the text similar to the following to “- VM”
C:/Program Files/Java/jdk1.8.0_ 51/bin/ javaw.exe “For – VM
C:/Program Files/Java/jdk1.8.0_ 51/bin
Eclipse Error: There are no resources that can be added or removed from the server.
How to Solve Error: There are no resources that can be added or removed from the server.
Solution. Select the project right click-->properties-->Project Facets--> Check Dynamic Web Project and java, etc. will be fine.
Java Error: No enclosing instance of type Main is accessible. Must qualify the allocation with an encl
The following error occurred today while compiling a Java program.
No enclosing instance of type Main is accessible. Must qualify the allocation with an enclosing instance of type Main (e.g. x.new A() where x is an instance of Main).
The source code I originally wrote looked like this
public class Main
{
class Dog
{
private String name;
private int weight;
public Dog(String name, int weight)
{
this.setName(name);
this.weight = weight;
}
public int getWeight()
{
return weight;
}
public void setWeight(int weight)
{this.weight = weight;}
public void setName(String name)
{this.name = name;}
public String getName()
{return name;}
}
public static void main(String[] args)
{
Dog d1 = new Dog("dog1",1);
}
}When this error occurred, I didn’t quite understand it.
After learning from other people’s explanation, I suddenly realized.
In the code, my dog class is an internal class defined in main. The dog inner class is dynamic, while my main method is static.
Just as static methods cannot call dynamic methods.
There are two solutions:
Method 1
Define the inner class dog as a static class.
Method 2
Define the inner class dog outside the main class.
Mongodb java version 3.X, prompt “XXX (an encryption algorithm) is not available” when there is a user name and password
First of all, describe the project environment: Maven + mongodb-java-driver-3.2.2
The original project was written with Mongo 2. X driver, and then upgraded to 3. X. The first big change is user name and password verification.
This is the way to get mongoclient.
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
/**
* MongoDBUtils
* @author administration
*
*/
public class DBUtil {
/**
* Connect to mongoDB with username password (MongoCredential method)
* @param mongodbAddr
* @param databaseName
* @return
*/
public static MongoClient getMongoClientByCredent(String mongodbAddr, String databaseName){
MongoClient mongoClient;
Properties p = TDTFile.getProperAddr("db.properties");
String user = p.getProperty("username");
String pswd = p.getProperty("password");
List<ServerAddress> serverAddrList = new ArrayList<ServerAddress>();
ServerAddress serverAddress = new ServerAddress(mongodbAddr);
serverAddrList.add(serverAddress);
List<MongoCredential> credentialList = new ArrayList<MongoCredential>();
MongoCredential credential = MongoCredential.createCredential(user, databaseName, pswd.toCharArray());
credentialList.add(credential);
mongoClient = new MongoClient(serverAddrList, credentialList);
return mongoClient;
}
/**
* Connect to mongoDB with username password (URI method)
* @param mongodbAddr
* @param databaseName
* @return
*/
public static MongoClient getMongoClientByURI(String mongodbAddr, String databaseName){
MongoClient mongoClient;
Properties p = TDTFile.getProperAddr("db.properties");
String user = p.getProperty("username");
String pswd = p.getProperty("password");
//System.out.println(user + "," + pswd);
String uri = String.format("mongodb://%s:%s@%s/%s", user, pswd, mongodbAddr, databaseName);
System.out.println(uri);
MongoClientURI mongoClientURI = new MongoClientURI(uri);
mongoClient = new MongoClient(mongoClientURI);
return mongoClient;
}
}
Two ways are no problem, run well in eclipse. But!! After packaging with MVN package, it can’t be used. After a night and a day’s analysis, I locked the root cause of the error in the statement that the command line executed the command. My sentence is like this:
java -Djava.ext.dirs=../lib Other parametersThe problem lies in the – D parameter. Baidu knows that – D is equivalent to setting external environment variables. Since my main method relies on many third-party jar packages, it seems that there is nothing wrong with it. But it ignores a problem, that is
After using the – D parameter to specify other directories, Java needs to load% Java_ The jar package in the home% \ JRE/lib/ext directory is no longer loaded!! I searched the usage of – D parameter on the Internet for a long time, but no one mentioned it.. But it’s hard for me. One day is wasted here..
Solution:
Package the required external dependent packages, including some packages such as JDK’s own encryption algorithm, into lib with Maven. Problem solving. By the way, the algorithm package required by mongodb3. X is% Java_ HOME%\jre\lib\ext\sunjce_ provider.jar
Java Error | Error:java: Compilation failed: internal java compiler error
Background
Error:java: Compilation failed: internal java compiler errorAccording to previous experience, the compiling environment of the read project is reset, and the JDK version is all specified as 1.8
1. Setting – & gt; Java complier
2.Project Structure->Modules
After the above steps are set, the same error will be reported in the recompile run
Solution
After investigation, the project Pom.xml The file does not specify a compiled version, in the Pom.xml Add the following plug-ins:
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>utf-8</encoding>
</configuration>
</plugin>
</plugins>
</build>The precision of decimal calculation with double and float in Java is not accurate
The precision of decimal calculation with double and float in Java is not accurate
In most cases, using double and float to calculate the result is accurate, but in some systems with high accuracy requirements or known decimal calculation results will not be accurate, this problem is very serious.
《Effective Java “refers to a principle, that is, float and double can only be used for scientific calculation or engineering calculation, but we should use them in commercial calculation java.math.BigDecimal By using the BigDecimal class, we can solve the above problems. The designer of Java provides a very useful class BigDecimal for programmers, which can improve the problem that the float and double classes can’t calculate accurately I’m sorry.
The example code is as follows:
package ex;
import java.math.*;
public class BigDecimalDemo {
public static void main(String[] args){
System.out.println(ArithUtil.add(0.01, 0.05));
System.out.println(ArithUtil.sub(1.0, 0.42));
System.out.println(ArithUtil.mul(4.015, 100));
System.out.println(ArithUtil.div(123.3, 100));
}
}
class ArithUtil{
private static final int DEF_DIV_SCALE=10;
private ArithUtil(){}
//+
public static double add(double d1,double d2){
BigDecimal b1=new BigDecimal(Double.toString(d1));
BigDecimal b2=new BigDecimal(Double.toString(d2));
return b1.add(b2).doubleValue();
}
//-
public static double sub(double d1,double d2){
BigDecimal b1=new BigDecimal(Double.toString(d1));
BigDecimal b2=new BigDecimal(Double.toString(d2));
return b1.subtract(b2).doubleValue();
}
//*
public static double mul(double d1,double d2){
BigDecimal b1=new BigDecimal(Double.toString(d1));
BigDecimal b2=new BigDecimal(Double.toString(d2));
return b1.multiply(b2).doubleValue();
}
// /
public static double div(double d1,double d2){
return div(d1,d2,DEF_DIV_SCALE);
}
public static double div(double d1,double d2,int scale){
if(scale<0){
throw new IllegalArgumentException("The scale must be a positive integer or zero");
}
BigDecimal b1=new BigDecimal(Double.toString(d1));
BigDecimal b2=new BigDecimal(Double.toString(d2));
return b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
}Now let’s analyze in detail why floating-point operations cause precision loss?
1. Binary representation of decimals
First we need to clarify the following two issues.
(1) How to convert decimal integers to binary numbers
The algorithm is simple. As an example, 11 is expressed as a binary number.
11/2=5 remainder 1
5/2=2 remainder 1
2/2=1 remainder 0
1/2=0 remainder 1
End of 0 11 is represented in binary as (from bottom to top):1011
In other words, will the algorithm for converting all integers into binary numbers go on indefinitely? Absolutely not, integers can always be represented exactly in binary, but not decimals.
(2) How decimal decimals are converted into binary numbers
The algorithm is to multiply by 2 until there are no more decimals. As an example, 0.9 is expressed as a binary number
0.9*2=1.8 Take the integer part 1
0.8(fractional part of 1.8)*2=1.6 Take the integer part 1
0.6*2=1.2 Take the integer part 1
0.2*2=0.4 Take the integer part 0
0.4*2=0.8 Take integer part 0
0.8*2=1.6 Take integer part 1
0.6*2=1.2 Take integer part 0
......... 0.9 Binary representation (from top to bottom): 1100100100100 ......
Note: The above calculation process is circular, which means that *2 can never eliminate the fractional part, so that the algorithm will go on indefinitely. Obviously, the binary representation of decimals is sometimes impossible to be exact. The reason is simple: can 1/3 be represented accurately in the decimal system? This explains the loss of precision in floating-point subtraction, where "subtraction is incomplete". .
2. Storage of float type in memory
It is well known that Java's float type takes up 4 bytes in memory. float's 32 binary bits are structured as follows
float memory storage structure
4bytes 31 30 29 ----23 22 ----0
Indicates real sign bit Exponential sign bit Exponential bit Valid number of bits
Where the sign bit 1 means positive and 0 means negative. The valid bits are 24 bits, one of which is the real sign bit.
The steps to convert a float type to memory storage format are
(1) First convert the absolute value of this real number into binary format, noting that the binary methods for the integer and decimal parts of the real number have been discussed above.
(2) Shift the decimal point of this binary format real number left or right by n bits until the decimal point moves to the right of the first significant digit.
(3) Count out twenty-three digits from the first digit to the right of the decimal point into the 22nd to the 0th digit.
(4) If the real number is positive, put a "0" in the 31st place, otherwise put a "1".
(5) If n is shifted to the left, the exponent is positive and "1" is placed in the 30th place. If n is shifted to the right or n=0, then "0" is placed in the 30th position.
(6) If n is obtained by left shift, n is converted to binary by subtracting 1 and adding "0" to the left to make up the seven bits and put it into the 29th to 23rd place. If n is shifted to the right or n=0, then n is converted to binary and "0" is added to the left to make up the seven bits, and then each bit is inverted and placed in bits 29 to 23.
Example: Memory storage format of 11.9
(1) The memory storage format of 11.9 is approximately "1011. 11100110011001100110011001100..." after converting 11.9 to binary. .".
(2) Shift the decimal point three places left to the right of the first significant digit: "1. 011 11100110011001100110". Ensure that the number of significant digits is 24, with the extra intercept on the right (where the error is created ).
(3) This already has twenty-four valid digits, remove the leftmost "1" to get "011 11100110011001100110" with 23 bits. (4) Since 11.9 is a valid number, it is a valid number.
(4) Since 11.9 is a positive number, put "0" in the 31st real sign bit.
(5) Since we are shifting the decimal point to the left, we put "1" in the 30th exponent sign position.
(6) Since we are shifting the decimal point 3 places to the left, we subtract 1 from 3 to get 2, convert it to binary, and add 7 bits to get 0000010, and put it in the 29th to 23rd place.
The final representation of 11.9 is: 0 1 0000010 011 11100110011001100110
Another example: the memory storage format of 0.2356
(1) After converting 0.2356 to binary, it is approximately 0.00111100010100000100100000.
(2) Move the decimal point three places to the right to get 1.11100010100000100100000.
(3) Count out twenty-three valid digits from the right of the decimal point, i.e. 1110001010100000100100000.
into the 22nd to the 0th digit.
(4) Since 0.2356 is positive, put a "0" in the 31st place.
(5) Since we have shifted the decimal point to the right, we put a "0" in the 30th place.
(6) Because the decimal point is shifted to the right by 3 bits, so the 3 is converted to binary, and the "0" is added to the left to make up the full seven
(6) Because the decimal point is shifted to the right by 3 bits, the 3 is converted to binary, and the "0" is added to the left to make up the seven bits to get 0000011.
The final value of 0.2356 is: 0 0 1111100 11100010100000100100000
Steps to convert a memory-stored float binary format to decimal.
(1) Write out the binary number from the 22nd to the 0th digit, and add a "1" to the leftmost digit to get twenty-four valid digits. Put the decimal point to the right of the leftmost "1".
(2) Take out the value n from the 29th to the 23rd digit, and invert the n digit when the 30th digit is "0". When the 30th digit is "1", increment n by 1.
(3) Shift the decimal point left by n (when the 30th digit is "0") or right by n (when the 30th digit is "1") to obtain a real number in binary.
(4) Convert this binary real number to decimal and add a plus or minus sign depending on whether the 31st bit is a "0" or a "1". 3. Subtraction of floating point
The process of adding and subtracting floating point is more complex than the process of fixed point. The process of completing a floating point addition or subtraction operation is roughly divided into four steps.
(1) Checking of the 0 operand.
If one of the two floating-point numbers to be added or subtracted is 0, the result of the operation is known without the need to perform some sequential operations.
(2) Comparing the magnitude of the ordinal (exponent bits) and completing the pair order.
To add or subtract two floating-point numbers, we must first see whether the exponent bits of the two numbers are the same, i.e., whether the decimal point positions are aligned. If the two numbers have the same exponent, it means the decimal points are aligned, and the addition and subtraction of the last number can be performed. On the contrary, if the two numbers have different ordinates, it means that the decimal points are not aligned, so we must make the ordinates of the two numbers the same, and this process is called pairing.
How to pair order (assuming two floating point numbers with exponent bits Ex and Ey ).
By shifting the mantissa to change Ex or Ey so that they are equal. Since floating point numbers are mostly speciated, shifting the trailing left number will cause the loss of the highest significant bit, resulting in a large error; while shifting the trailing right number will cause the loss of the lowest significant bit, but the error caused is smaller, therefore, the pairwise order operation requires that the trailing right number be shifted, and after the trailing right number is shifted, the order code is increased accordingly, while its value remains unchanged. Obviously, if one of the increased ordinals is equal to the other, the increased ordinal must be a small one. Therefore, in the order pairing, always make the small order to the large order, that is, the end of the small order shift to the right (equivalent to the decimal point left shift), each right shift one, its order code plus 1, until the two numbers of the order code equal, the number of right shift is equal to the order difference △ E.
(3) The mantissa (valid digits) is added or subtracted.
(4) The result is normalized and rounded.Twitter’s distributed self increasing ID algorithm snowflake (Java version)
summary
In distributed systems, there are some scenarios where a globally unique ID is needed. In this case, in order to prevent ID conflicts, a 36 bit UUID can be used. However, UUID has some disadvantages. First, it is relatively long. In addition, UUID is generally unordered.
Sometimes we want to use a simpler ID, and we want the ID to be generated in time order.
Twitter’s snowflake solved this problem. At first, twitter migrated the storage system from Mysql to Cassandra. Because Cassandra had no sequential ID generation mechanism, it developed such a global unique ID generation service.
structure
The structure of each part is as follows:
0 – 0000000000 0000000000 0000000000 0000000000 0 – 00000 – 00000 – 000000000000
The first bit is unused, the next 41 bits are milliseconds (the length of 41 bits can be used for 69 years), then 5-bit datacenterid and 5-bit workerid (the length of 10 bits can support deployment of 1024 nodes at most), and the last 12 bits are counts within milliseconds (the 12 bit counting sequence number supports 4096 ID serial numbers per millisecond for each node)
A total of 64 bits, a long type. (length of converted string is 18)
The IDs generated by snowflake are sorted according to the time increment, and there is no ID collision (distinguished by datacenter and workerid) in the whole distributed system, and the efficiency is high. It is said that snowflake can generate 260000 IDS per second.
Source code
(Java version of the source)
/**
* Twitter_Snowflake<br>
* The structure of SnowFlake is as follows (each part is separated by -):<br>
* 0 - 0000000000 0000000000 0000000000 0000000000 0 - 00000 - 00000 - 000000000000 <br>
* 1-bit identifier, as the long basic type is signed in Java, the highest bit is the sign bit, positive numbers are 0, negative numbers are 1, so the id is generally positive, the highest bit is 0 <br>
* 41-bit time intercept (milliseconds), note that the 41-bit time intercept is not a time intercept to store the current time, but the difference between the time intercept (current time intercept - start time intercept)
* the value obtained), where the start time intercept, generally our id generator to start using the time specified by our program (the following program IdWorker class startTime property). 41-bit time intercept, you can use 69 years, year T = (1L << 41)/(1000L * 60 * 60 * 24 * 365) = 69<br>
* 10-bit data machine bits that can be deployed in 1024 nodes, including 5-bit datacenterId and 5-bit workerId<br>
* 12-bit sequential, millisecond counting, 12-bit counting sequence number supports 4096 ID sequential numbers per node per millisecond (same machine, same time cutoff)<br>
* Add up to exactly 64 bits for a Long type. <br>
* The advantage of SnowFlake is that the overall self-increasing sorting by time and no ID collision within the whole distributed system (distinguished by data center ID and machine ID), and high efficiency, tested, SnowFlake can generate about 260,000 IDs per second.
*/
public class SnowflakeIdWorker {
// ==============================Fields===========================================
/** Start time cutoff (2015-01-01) */
private final long twepoch = 1420041600000L;
/* The number of bits occupied by the machine id */
private final long workerIdBits = 5L;
/* The number of bits occupied by the data identifier id */
private final long datacenterIdBits = 5L;
/* The maximum machine id supported, resulting in 31 (this shift algorithm can quickly calculate the maximum number of decimal digits that can be represented by a few binary digits) */
private final long maxWorkerId = -1L ^ (-1L << workerIdBits);
/* The maximum supported data identifier id, resulting in 31 */
private final long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);
/** The number of bits in the id that the sequence occupies */.
private final long sequenceBits = 12L;
/** The machine ID is shifted 12 bits to the left */.
private final long workerIdShift = sequenceBits;
/** The data identifier id is shifted to the left by 17 bits (12+5)*/.
Private final long datacenterIdShift = sequenceBits + workerIdBits。
/** The time truncation is shifted to the left by 22 bits (5+5+12) */.
private final long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits。
/** Generate the mask for the sequence, here 4095. (0b111111111111=0xfff=4095) */
private final long sequenceMask = -1L ^ (-1L << sequenceBits);
/** Work machine ID(0~31) */
private long workerId;
/** Work machine ID(0~31) */
private long datacenterId;
/** Intra-millisecond sequence (0~4095) */
private long sequence = 0L;
/** Time cutoff of the last generated ID */
private long lastTimestamp = -1L;
//==============================Constructors=====================================
/**
* Constructor
* @param workerId Job ID (0~31)
* @param datacenterId datacenterId (0~31)
*/
public SnowflakeIdWorker(long workerId, long datacenterId) {
if (workerId > maxWorkerId || workerId < 0) {
throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxWorkerId));
}
if (datacenterId > maxDatacenterId || datacenterId < 0) {
throw new IllegalArgumentException(String.format("datacenter Id can't be greater than %d or less than 0", maxDatacenterId));
}
this.workerId = workerId;
this.datacenterId = datacenterId;
}
// ==============================Methods==========================================
/**
* Get the next ID (this method is thread-safe)
* @return SnowflakeId
*/
public synchronized long nextId() {
long timestamp = timeGen();
//If the current time is less than the timestamp of the last ID generation, it means that the system clock is backed off and an exception should be thrown at this time
if (timestamp < lastTimestamp) {
throw new RuntimeException(
String.format("Clock moved backwards. Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
}
//If it was generated at the same time, then perform a sequence within milliseconds
if (lastTimestamp == timestamp) {
sequence = (sequence + 1) & sequenceMask;
// sequence overflow in milliseconds
if (sequence == 0) {
//Block until the next millisecond, get the new timestamp
timestamp = tilNextMillis(lastTimestamp);
}
}
//Timestamp change, sequence reset in milliseconds
else {
sequence = 0L;
}
//Time cutoff of the last generated ID
lastTimestamp = timestamp;
//Shifted and put together by orthogonal operations to form a 64-bit ID
return ((timestamp - twepoch) << timestampLeftShift) //
| (datacenterId << datacenterIdShift) //
| (workerId << workerIdShift) //
| sequence;
}
/**
* Block to the next millisecond until the new timestamp is obtained
* @param lastTimestamp Time cutoff of the last generated ID
* @return currentTimestamp
*/
protected long tilNextMillis(long lastTimestamp) {
long timestamp = timeGen();
while (timestamp <= lastTimestamp) {
timestamp = timeGen();
}
return timestamp;
}
/**
* Returns the current time in milliseconds
* @return current time in milliseconds
*/
protected long timeGen() {
return System.currentTimeMillis();
}
//==============================Test=============================================
/** TEST */
public static void main(String[] args) {
SnowflakeIdWorker idWorker = new SnowflakeIdWorker(0, 0);
for (int i = 0; i < 1000; i++) {
long id = idWorker.nextId();
System.out.println(Long.toBinaryString(id));
System.out.println(id);
}
}
}
“21442;” 32771;
Java uses single thread pool to realize multi thread sequential execution (non alternating, non synchronous)
1. Principle and mechanism
Use one-way pool to ensure orderly submission and execution.
explain:
1) Alternate execution between threads is not supported.
2) Multithreading is not synchronous, only to ensure the order of execution, multithreading is concurrent execution.
2. Code examples
package com.thread;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class TasksWithoutLockTest extends Thread {
private static int num = 0;
private int id;
public TasksWithoutLockTest(int id) {
this.id = id;
}
@Override
public void run() {
System.out.println("Thread" + id + "output num:" + num++);
try {
Thread.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
//ExecutorService exec = Executors.newFixedThreadPool(1);
ExecutorService exec = Executors.newSingleThreadScheduledExecutor();
for (int i = 0; i < 12; i++) {
exec.submit(new TasksWithoutLockTest(i));
}
exec.shutdown();
}
}3. Output results
Asynchronous processing of HTTP request by Java_ Method 2: through deferredresult
1.DeferredResult
Spring supports HTTP asynchronous return
2. Asynchronous processing
Start a new thread, process the data and return the value.
3. Code examples
1）controller
package com.liuxd.controller;
import com.liuxd.entity.Responses;
import com.liuxd.service.TaskService2;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;
@Slf4j
@RestController
public class AsyncCtr2 {
@Autowired
private TaskService2 taskService2;
@GetMapping(value = "/getResult")
public DeferredResult<Responses<String>> getResult() {
log.info("HTTP request received...");
long startTime = System.currentTimeMillis();
DeferredResult<Responses<String>> deferredResult = new DeferredResult<Responses<String>>();
new Thread(new Runnable() {
@Override
public void run() {
taskService2.getData(deferredResult);
}
}).start();
log.info("The task of the receiving HTTP request thread has been completed, exit!");
long endTime = System.currentTimeMillis();
log.info("http Total request time. " + (endTime - startTime) + "ms");
return deferredResult;
}
}
2）service
package com.liuxd.service;
import com.liuxd.entity.Responses;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.context.request.async.DeferredResult;
@Slf4j
@Service
public class TaskService2 {
public void getData(DeferredResult<Responses<String>> deferredResult) {
log.info("Call service asynchronous with return method, start execution...");
long startTime = System.currentTimeMillis();
try {
Thread.sleep(2500L);
} catch (InterruptedException e) {
e.printStackTrace();
}
log.info("Call service asynchronous has return method, the end of execution!!!") ;
long endTime = System.currentTimeMillis();
log.info("Total time taken to call service asynchronous return method. " + (endTime - startTime) + "ms");
deferredResult.setResult(new Responses<>(0, "Done", "SUCCESS"));
}
}
3）Responses
package com.liuxd.entity;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class Responses<T> {
private Integer code;
private String msg;
private T data;
}
4) Print results
5) Result analysis
1) The HTTP main thread accepts the request and ends after processing the request
2) After the asynchronous thread ends, returns the