继承变量上的@ConfigurationProperties [英] @ConfigurationProperties on inherited variable

问题描述

我有一个看起来像这样的超类

I have a superclass that looks like this

public class MyProvider {
    private Integer id;
    private ProviderAccount account;
}

扩展类

@Component
@ConfigurationProperties(prefix = "provider.custom")
public class CustomProvider extends MyProvider {
//this should have CustomProviderAccount
}

provider.custom 的配置

provider.custom.account.index=1
provider.custom.account.enabled=false
provider.custom.account.description=New Live

帐户类别

public class ProviderAccount {
    private Integer index;
}

public class CustomProviderAccount extends ProviderAccount {
    private boolean enabled;
    private String description;
}

当我尝试将 CustomProvider.getAccount() 从 ProviderAccount 强制转换为 CustomProviderAccount 时，我收到一个无法强制转换的异常.

When I try to cast CustomProvider.getAccount() from ProviderAccount to CustomProviderAccount I get an exception that I cannot cast.

引起:java.lang.ClassCastException:com.example.bean.hrs.ProviderAccount 不能转换为com.triphop.bean.hrs.CustomProviderAccount 在com.triphop.service.HRSServiceImpl.test(HRSServiceImpl.java:205) 在sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)在 java.lang.reflect.Method.invoke(Method.java:498)

Caused by: java.lang.ClassCastException: com.example.bean.hrs.ProviderAccount cannot be cast to com.triphop.bean.hrs.CustomProviderAccount at com.triphop.service.HRSServiceImpl.test(HRSServiceImpl.java:205) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498)

知道如何在 Spring 中实现这一目标吗?

Any idea how can I achieve this in Spring?

推荐答案

@ConfigurationProperties 注释不是 @Inherited.您需要在您的子类中定义它以实现您想要做的事情.

The @ConfigurationProperties annotation isn't @Inherited. You would need to define it on your child class to achieve what you are looking to do.

https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/context/properties/ConfigurationProperties.html

https://docs.oracle.com/javase/7/docs/api/java/lang/annotation/Inherited.html

您可以为值创建一个通用包装器，并为每种类型的 provider 创建一个 Map，而不是使用扩展.

Rather than using extension you could just create a generic wrapper for the values and create a Map for each type of provider.

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