如何从 application.yml 文件注入属性？

Question

我有一些 application.yml 文件：

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

    data:
      prop1: 1
      prop2: 0

和class是：

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);
    }
}

我有这个例外：

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 classes 地方都在一个包中。我不想让我的数据 class public。如何从 application.yml 注入数据？

Answer 1

像这样格式化yml：

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

      data:
        prop1: 1
        prop2: 0

Answer 2

@Data 利用了 @RequiredArgsConstructor。尝试通过覆盖它创建的构造函数的可见性来定义 @Data 注释的行为：

@RequiredArgsConstructor(access = AccessLevel.PUBLIC)

具有 @Data 和 @RequiredArgsConstructor，Lombok 将使用您定义的访问级别。

要么这样，要么尝试定义一个 @NoArgsConstructor。

Answer 3

我是这样解决问题的：

我添加了 spring 注释 @Autowired 到 abscractPropertyHolder class 并添加了 spring 注释 @ConfigurationProperties("main-prop.sub-prop.data") 到数据 class。

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);
    }
}

如何从 application.yml 文件注入属性？

How to inject properties from application.yml file?

java

spring

lombok

spring-boot