Question

我有一些application.yml文件：

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

    data:
      prop1: 1
      prop2: 0

和课程：

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注入数据？

Answer 1

我解决了这样的问题：

我在abscractPropertyHolder类中添加了弹簧注释@Autowired，并在Data类中添加了弹簧注释@ConfigurationProperties("main-prop.sub-prop.data")。

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);
    }
}

Answer 2

像这样格式化yml：

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

      data:
        prop1: 1
        prop2: 0

Answer 3

@Data使用@RequiredArgsConstructor。尝试通过覆盖其创建的构造函数的可见性来定义@Data注释的行为：

@RequiredArgsConstructor(access = AccessLevel.PUBLIC)

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

要么这样做，要么尝试定义@NoArgsConstructor。

如何从application.yml文件注入属性？

3 个答案: