Author Archives: Robins

Mex compiler error handling in MATLAB and GCC installation in Ubuntu

I, MATLAB use mex error and GCC installation of a variety of problems to solve.

when I run my program, I notice that the “model” in the image below has not defne. (undefined)

access to a number of data, walk a lot of detours, only to find that the original is tex-mex file not compile.
then, compile tex-mex file, enter: tex-mex – setup
found an error again: “No supported compiler or the SDK was found.”

open baidu began to browse a variety of, dazzling methods… In fact, you only need to download the supported compiler or SDK.

is here, and since I’m ubuntu’s matlab for Linux, all I need to do is install GCC.

the steps are as follows:

sudo apt-get build-dep GCC

sudo apt-get  build-dep  gcc  

after the above method is used, the following situation occurs:

Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

enter the command:

sudo rm /var/lib/dpkg/lock
sudo dpkg --configure -a

when you run the initial command, the following situation occurs:

Unable to locate package
execute:

sudo apt-get update

start installation… Error:

, possibly due to network or other conflicts

ubuntu apt-get (You must put some ‘source’ URIs in your sources. List)
E: You must put some ‘source’ URIs in your sources. List

solution:

sudo vi /etc/apt/sources.list

open an editor and type:
copy code

deb-src http://archive.ubuntu.com/ubuntu trusty main restricted #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-updates restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #Added by software-properties
deb-src http://security.ubuntu.com/ubuntu trusty-security restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-proposed restricted main universe multiverse #Added by software-properties

copy code
press Esc, enter: wq, then enter the command:

sudo apt-get update

: “E45: ‘readonly’ option is set (add! To override)

this is authority, set file into read-only permissions, as is known to all, read-only files need to be performed prior to such modification sudo, but have changed, how to enforce save?Geeks tell you! Just save and execute the following command:

:wq! The above command is to force save exit, and then you can!

try again to run sudo apt-get build-dep GCC, again failed.

method 2: enter the command: sudo apt-get install build-essential

sudo apt-get  install  build-essential

start installation, successful.

Windows of matlab in tex-mex compilation fails, go to https://ww2.mathworks.cn/support/requirements/supported-compilers.html directly download the corresponding matlab version of MinGW C/C + + 6.3.

Finally, enter MTALAB and enter met-setup


choose first.
raises a problem to be solved: train a decision tree, use the random forest classifier to extract the features of the input image, and output the frequency image??

docker: error pulling image configuration:timeout

docker: error pulling image configuration:timeout

error:

docker: error pulling image configuration:

dial TCP 104.18.121.25:443: I /o timeout.

resolved:

vim/etc/docker/daemon. Json
{
“registry – mirrors” : [” https://registry.docker-cn.com “, “https://nrbewqda.mirror.aliyuncs.com”, “https://dmmxhzvq.mirror.aliyuncs.com”]
}

systemctl restart docker

and then pull mirror to

Linux (error 1819 (HY000): your password does not satisfy the current policy requirements)

problem ERROR 1819 (HY000): Your password does not satisfy the current policy requirements. To enhance security, MySQL5.7 randomly generated a password for root user. In the error log, regarding the location of the error log, if the RPM package is installed, the default is /var/log/mysqld.log.

can generally be set by log_error

obtain temporary password of MySQL by # grep "password" /var/log/mysqld.log command
2016-01-19T05:16:36.218234Z 1 [Note] A temporary password is generated for root@localhost: WaQ,qR%be2(5

mysql> select user();
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

If

is simply changed to a simple password, the following error is reported:

mysql> ALTER USER USER() IDENTIFIED BY '12345678';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

The

is actually related to the value of validate_password_policy.

validate_password_policy has the following values:

default is 1, which is MEDIUM, so the password you set at the beginning must be length, and must contain Numbers, lowercase or uppercase letters, and special characters.

sometimes, just for testing purposes, I don’t want to make the password that complicated. For example, I just want to set root’s password to 123456.

must modify two global parameters:

First, change the value of the validate_password_policy parameter

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

thus, the criteria for judging a password are based on the length of the password. This is determined by the validate_password_length parameter.

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|             8 |
+----------------------------+
1 row in set (0.00 sec)

The

validate_password_length parameter defaults to 8 and has a minimum value of

validate_password_number_count
+ validate_password_special_char_count
+ (2 * validate_password_mixed_case_count)

where validate_password_number_count specifies the length of the data in the password, validate_password_special_char_count specifies the length of the special characters in the password, and validate_password_mixed_case_count specifies the length of the size letters in the password.

these parameters have a default value of 1, so validate_password_length has a minimum value of 4. If you explicitly specify validate_password_length to be less than 4, it will not error, but validate_password_length will be 4. As follows:

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|             8 |
+----------------------------+
1 row in set (0.00 sec)
 
mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)
 
mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|             4 |
+----------------------------+
1 row in set (0.00 sec)

if you change validate_password_number_count, validate_password_special_char_count, and validate_password_mixed_case_count any value, then validate_password_length will be dynamically changed.

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|             4 |
+----------------------------+
1 row in set (0.00 sec)
 
mysql> select @@validate_password_mixed_case_count;
+--------------------------------------+
| @@validate_password_mixed_case_count |
+--------------------------------------+
|                  1 |
+--------------------------------------+
1 row in set (0.00 sec)
 
mysql> set global validate_password_mixed_case_count=2;
Query OK, 0 rows affected (0.00 sec)
 
mysql> select @@validate_password_mixed_case_count;
+--------------------------------------+
| @@validate_password_mixed_case_count |
+--------------------------------------+
|                  2 |
+--------------------------------------+
1 row in set (0.00 sec)
 
mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|             6 |
+----------------------------+
1 row in set (0.00 sec)

verify whether the validate_password plug-in is installed?You can view the following parameters, if not installed, the output will be empty.

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name            | Value |
+--------------------------------------+-------+
| validate_password_dictionary_file  |    |
| validate_password_length       | 6   |
| validate_password_mixed_case_count  | 2   |
| validate_password_number_count    | 1   |
| validate_password_policy       | LOW  |
| validate_password_special_char_count | 1   |
+--------------------------------------+-------+

Node.js Using port 80 to report errors in Linux

node. js USES port 80 in Linux to report an error

Because the server USES CentOS8, the local environment is changed to Linux to facilitate development and deployment.

FATAL listen EACCES: Permission denied 0.0.0.0:80
the at Server setupListenHandle [as _listen2] (net. Js: 1296:21)
the at listenInCluster (net. Js: 1361:12)
the at doListen (net. Js: 1498:7)
the at processTicksAndRejections (internal/process/task_queues. Js: 85:21)
✖ Nuxt Fatal Error
Error: listen EACCES: permission denied 0.0.0.0:80
NPM ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! xxx dev: nuxt
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the xxx.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/xxx/.npm/_logs/xxx-debug.log

solution

initially suspected that port 80 was occupied, but when I checked the port information, I found that port 80 was not occupied, so I should have no permission to use port 80. The simple solution is to add sudo.

Replace NPM run devsudo NPM run dev

How to Fix GIT Push Error

problem 1:

after creating a new local branch, push the local branch to the remote library, and report an error

when using git pull or git push

gitThere is no tracking information for the current branch.

Please specify which branch you want to merge with.

See git-pull(1) for details

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=origin/<branch> merged0.9.6

because there is no connection between the local branch and the remote branch (you can see the association between the local branch and the remote branch using git branch-vv). At the command line prompt, simply execute the following command to

git branch --set-upstream-to=origin/ upstream/local branch name

View all branches of local and remote repositories
git branch -a
view branches of remote repositories
git branch -r


problem 2
git push again,

 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'https://gitee.com/caizelin111/securitydemo'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

Solutions:

1, the git pull origin master – allow – unrelated – nothing// the remote warehouse and local synchronization, eliminate the differences between </ p>

2, readd and commit corresponding files

3, git push origin master

4, at this point can upload successfully

Idea2020.2 encountered pom.xml The problem of file error report in Maven plug-in tomcat7

before baidu to find the answer, is dependent on specified in the servlets API – add provided

find their dependence has been added, did not find a solution.
red error, ali cloud warehouse can’t download the file. An error is as follows:

find file location, delete maven local repository file

solution: Specify the version information 2.2

Springboot integration redis reports non null key required (solved)

SpringBoot integrated Redis reports non null key required(resolved)

notice if the key value given or passed is empty, if it is empty it will report this error

1. Create the SpringBoot project, create the necessary package
; 2. Create application.yml for relevant configuration

server:
  port: 8080
  servlet:
    context-path: /redis
    #mybatis配置
mybatis-plus:
  configuration:
    map-underscore-to-camel-case: true
  type-aliases-package: com.today.springboot.dao
  mapper-locations: classpath*:mapper/*.xml
spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/mysql_begin?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&allowPublicKeyRetrieval=true&useSSL=false
    type: com.alibaba.druid.pool.DruidDataSource
  redis:
    host: 127.0.0.1
    port: 6379

3. Write redisconfig. Java configuration class

@Configuration
@EnableCaching
public class RedisConfig {

    //编写我们自己的redisTemplate
    //这是写好的一个固定模板,在企业中可以直接使用
    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory){
        //我们为了自己开发方便,一般直接使用<String, Object>
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);

        //json序列化配置
        Jackson2JsonRedisSerializer<Object> j2rs = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper om=new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        j2rs.setObjectMapper(om);
        //String的序列化
        StringRedisSerializer srs = new StringRedisSerializer();

        //key采用String序列化方式
        template.setKeySerializer(srs);
        //hash的key采用String的序列化方式
        template.setHashKeySerializer(srs);
        //value序列化方式采用jackson
        template.setValueSerializer(j2rs);
        //hash的value序列化方式采用jackson
        template.setHashValueSerializer(j2rs);
        template.afterPropertiesSet();

        return template;
    }

    /**
     * 对hash类型的数据操作
     *
     * @param redisTemplate
     * @return
     */
    @Bean
    public HashOperations<String, String, Object> hashOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForHash();
    }

    /**
     * 对redis字符串类型数据操作
     *
     * @param redisTemplate
     * @return
     */
    @Bean
    public ValueOperations<String, Object> valueOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForValue();
    }

    /**
     * 对链表类型的数据操作
     *
     * @param redisTemplate
     * @return
     */
    @Bean
    public ListOperations<String, Object> listOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForList();
    }

    /**
     * 对无序集合类型的数据操作
     *
     * @param redisTemplate
     * @return
     */
    @Bean
    public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForSet();
    }

    /**
     * 对有序集合类型的数据操作
     *
     * @param redisTemplate
     * @return
     */
    @Bean
    public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForZSet();
    }
}

4, write redisutil.java helper class. To encapsulate Redis operations, of course, write the appropriate helper class

for your own coding

@Component
public class RedisUtil {


    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    //=================common==================

    /**
     * 指定缓存失败时间
     *
     * @param key  键
     * @param time 时间(秒)
     * @return
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 根据key 获取过期时间
     *
     * @param key 键 不能为null
     * @return 时间(秒) 返回0代表为永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }


    /**
     * 判断key是否存在
     *
     * @param key 键
     * @return true存在  false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 删除缓存
     *
     * @param key 可以传一个或多个值
     */
    @SuppressWarnings(value = "unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }

    // ================String==================

    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 普通缓存放入
     *
     * @param key   键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 普通缓存放入并设置时间
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限制
     * @return true成功 false失败
     */
    public boolean set(String key, String value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 递增
     *
     * @param key   键
     * @param delta 要减少几个
     * @return
     */
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, delta);
    }

    /**
     * 递减
     *
     * @param key   键
     * @param delta 要减少几个
     * @return
     */
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }

    // =================Map===================

    /**
     * HashGet
     *
     * @param key  键 不能为null
     * @param item 项 不能为null
     * @return
     */
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }

    /**
     * 获取hashKey对应的所有键值
     *
     * @param key 键
     * @return map 对应多个键值
     */
    public Map<Object, Object> hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * HashSet
     *
     * @param key 键
     * @return map 对应多个键值
     */
    public boolean hmset(String key, Map<String, Object> map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * HashSet并设置时间
     *
     * @param key  键
     * @param map  对应多个键值
     * @param time 时间(秒)
     * @return true成功 false失败
     */
    public boolean hmset(String key, Map<String, Object> map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 向一张hash表中放入数据,如果不存在将创建
     *
     * @param key   键
     * @param item  项
     * @param value 值
     * @return true成功 false失败
     */
    public boolean hset(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 向一张hash表中放入数据,如果不存在将创建
     *
     * @param key   键
     * @param item  项
     * @param value 值
     * @param time  时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间
     * @return true成功 false失败
     */
    public boolean hset(String key, String item, Object value, long time) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 删除hash表中的值
     *
     * @param key  键 不能为null
     * @param item 项 可以有多个 不能为null
     */
    public void hdel(String key, Object... item) {
        redisTemplate.opsForHash().delete(key, item);
    }

    /**
     * 判断hash表中是否有该项的值
     *
     * @param key  键 不能为null
     * @param item 项 不能为null
     * @return true存在 false不存在
     */
    public boolean hHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }

    /**
     * hash递增 如果不存在,就会创建一个 并把新增后的值返回
     *
     * @param key  键
     * @param item 项
     * @param by   要增加几(大于0)
     */
    public double hincr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }

    /**
     * hash递减
     *
     * @param key  键
     * @param item 项
     * @param by   要减少几(小于0)
     */
    public double hdecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }

    //====================set===================

    /**
     * 根据key获取set中的所有值
     *
     * @param key 键
     * @return
     */
    public Set<Object> sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 根据value从一个set中查询,是否存在
     *
     * @param key   键
     * @param value 值
     * @return true存在 false不存在
     */
    public boolean sHasKey(String key, Object value) {
        try {
            return redisTemplate.opsForSet().isMember(key, value);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将数据放入set缓存
     *
     * @param key    键
     * @param values 值 可以是多个
     * @return 成功个数
     */
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 将set数据放入缓存
     *
     * @param key    键
     * @param time   时间(秒)
     * @param values 值 可以是多个
     * @return 成功个数
     */
    public long sSetAndTime(String key, long time, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().add(key, values);
            if (time > 0) {
                expire(key, time);
            }
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 获取set缓存的长度
     *
     * @param key 键
     */
    public long sGetSetSize(String key) {
        try {
            return redisTemplate.opsForSet().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 移除值为value的
     *
     * @param key    键
     * @param values 值 可以是多个
     * @return 移除的个数
     */
    public long setRemove(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().remove(key, values);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    //=================List===================

    /**
     * 获取list缓存的内容
     *
     * @param key   键
     * @param start 开始
     * @param end   结束 0 到 -1代表所有值
     */
    public List<Object> lGet(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 获取list缓存的长度
     *
     * @param key 键
     */
    public long lGetListSize(String key) {
        try {
            return redisTemplate.opsForList().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 通过索引 获取list中的值
     *
     * @param key   键
     * @param index 索引index>=0时, 0 表头,1 第二个元素,以此类推:index<0时,-1表尾,-2倒数第二个元素,以此类推
     */
    public Object lGetIndex(String key, long index) {
        try {
            return redisTemplate.opsForList().index(key, index);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     */
    public boolean lSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     */
    public boolean lSet(String key, Object value, long time) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @return
     */
    public boolean lSet(String key, List<Object> value) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     * @return
     */
    public boolean lSet(String key, List<Object> value, long time) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 根据索引修改list中的某条数据
     *
     * @param key   键
     * @param index 索引
     * @param value 值
     * @return
     */
    public boolean lUpdateIndex(String key, long index, Object value) {
        redisTemplate.opsForList().set(key, index, value);
        try {
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 移除N个为value值
     *
     * @param key   值
     * @param count 移除多少个
     * @param value 值
     * @return 移除的个数
     */
    public long lRemove(String key, long count, Object value) {
        try {
            return redisTemplate.opsForList().remove(key, count, value);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
}

5, willful your creative mind to write the best website and system
here to write some test classes to help understand

@SpringBootTest
class RedisSpringbootApplicationTests {

    @Autowired
    @Qualifier("redisTemplate")
    private RedisTemplate redisTemplate;

    @Autowired
    private RedisUtil redisUtil;

    @Test
    public void test1(){
        redisUtil.set("name","today");
        System.out.println(redisUtil.get("name"));
    }

    @Test
    void contextLoads() {
        //redisTemplate
        //opsForValue操作字符串 类似String
        //opsForList操作List 类似List


        //获取redis的连接对象
		//RedisConnection connection = redisTemplate.getConnectionFactory().getConnection();
		//connection.flushDb();
		//connection.flushAll();

        redisTemplate.opsForValue().set("mykey","今天");
        System.out.println(redisTemplate.opsForValue().get("mykey"));
    }

    @Test
    public void test() throws JsonProcessingException {
        //真实的开发一般都使用json来传递对象
        User user = new User("today", 3);
		// String jsonUser = new ObjectMapper().writeValueAsString(user);
        redisTemplate.opsForValue().set("user",user);
        System.out.println(redisTemplate.opsForValue().get("user"));
    }

}

published in CSDN for the first time, please forgive me if there is any mistake

Eo ferror: compressed file ended before the end of stream marker was reached

One of the reasons for the

error: at the time the data was first downloaded, the downloaded resource was incomplete due to network reasons or other reasons.
solution:

  • can delete the downloaded resources, download
  • to find the relevant resources, put the complete resources into the Dataset file (if you don’t know where the Dataset folder is, then the error information is prompted, you can go to the corresponding path to find.) Usually in your system’s home directory.

?