java - 如何从 application.yml 文件注入(inject)属性？

Question

我有一些 application.yml 文件:

main-prop:
  sub-prop:
    name: test
    password: test1

    data:
      prop1: 1
      prop2: 0

和类:

abstract class abscractPropertyHolder {
    private String namePattern;
    private String categoryPattern;
    private String departmentPattern;
    private Data data;
}

@Component
@ConfigurationProperties("main-prop")
class ReconfigurationEventFilterConfig extends abscractPropertyHolder {
}

@Data
@Accessors(chain = true)
class Data {   // if my class is public - my app run successfully, otherwise fail to start (exception).
    private int prop1;
    private int prop2;

    static DatanewInstanceWithDefaultParameters() {
        return new Data().setProp1(1).setProp2(0);
    }
}

我有一个异常(exception):

Could not instantiate property type [com.test.Data] to auto-grow nested property path; 
nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [com.test.Data]: Is the constructor accessible?;
nested exception is java.lang.IllegalAccessException: 
Class org.springframework.beans.BeanUtils can not access a member of class 
com.test.Data with modifiers "public"

所有类都放在一个包中。我不想公开我的数据类。如何从 application.yml 注入(inject)数据？

Answer 1

我这样解决了这个问题:

我将spring注释@Autowired添加到abscratPropertyHolder类，并将spring注释@ConfigurationProperties("main-prop.sub-prop.data")添加到Data类。

abstract class abscractPropertyHolder {
    private String namePattern;
    private String categoryPattern;
    private String departmentPattern;
    @Autowired
    private Data data;
}

@Data
@Accessors(chain = true)
@ConfigurationProperties("main-prop.sub-prop.data")
class Data {   // if my class is public - my app run successfully, otherwise fail to 
start (exception).
    private int prop1;
    private int prop2;

    static DatanewInstanceWithDefaultParameters() {
        return new Data().setProp1(1).setProp2(0);
    }
}