In springboot, there are the following problems when binding the properties in the class with the configuration in the configuration file:

When using @ configurationproperties, the following prompt appears at the top of idea:

Click the prompt to jump to the official document, and then add the following configuration in POM. XML

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

The effect after adding is that when you write the configuration file (YML, properties configuration file), you will be prompted

After the above is finished, @ configurationproperties will report an error below. You can see it according to the prompt

Not registered via @ enableconfigurationproperties or marked as spring component    @ Enable configuration properties (person. Class),

After adding, the error is really gone, but in the unit test of springboot, you will see the following error: could not autowire. No beans of ‘person’ type found

  Go back to the user-defined bean person, add the annotation @ component and declare to add the component to the container so that it can be used?

“Only if this component is a component in the container can the @ configurationproperties function provided by the container be used.”