如何从 ControllerAdvice 类中的 ControllerAdvice 选择器中检索属性

问题描述

我可以定义一个 Spring ControllerAdvice，它由使用自定义注解的控制器子集有选择地使用:

I can define a Spring ControllerAdvice that is selectively used by a subset of controllers using a custom annotation:

@RestController
@UseAdviceA
@RequestMapping("/myapi")
class ApiController {
 ...
}

@ControllerAdvice(annotations = UseAdviceA.class)
class AdviceA {

 ...
}

但是是否可以通过自定义注释传入一个属性，建议类可以从注释中获取?例如:

But is it possible to pass in an attribute via the custom annotation where the advice class can pick up from the annotation? For e.g.:

@RestController
@UseAdviceA("my.value")
@RequestMapping("/myapi")
class ApiController {
 ...
}

@ControllerAdvice(annotations = UseAdviceA.class)
class AdviceA {
 // Some way to get the string "myvalue" from the instance of UseAdviceA
 ...
}

实现相同结果的任何其他方式，即能够在 Controller 方法中定义自定义配置，该配置可以传递给 ControllerAdvice 也将不胜感激.

Any other way to achieve the same outcome, which is to be able to define a custom configuration at the Controller method which can be passed to the ControllerAdvice would be much appreciated too.

推荐答案

这里有一个解决方案.
给定

Here is a solution.
Given

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface UseAdviceA {
  public String myValue();
}  

控制器

@RestController
@UseAdviceA(myValue = "ApiController")
@RequestMapping("/myapi")
class ApiController {
 ...
}

你的控制器建议应该像

@ControllerAdvice(annotations = {UseAdviceA.class})
class AdviceA {

  @ExceptionHandler({SomeException.class})
  public ResponseEntity<String> handleSomeException(SomeException pe, HandlerMethod handlerMethod) {
    String value = handlerMethod.getMethod().getDeclaringClass().getAnnotation(UseAdviceA.class).myValue();
     //value will be ApiController
    return new ResponseEntity<>("SomeString", HttpStatus.BAD_REQUEST);
  }

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