前言
在请求到达了 DispatcherServlet 的处理流程，进入 doDispatch( ) 以及后续流程处理业务的过程中出现异常，会进入到 processDispatchResult( ) 处理异常，此时，如果定义了@ControllerAdvice、@RestControllerAdvice 对应的方法能够处理该异常，则进入对应的方法进行异常处理。
一、示例
1、返回值结构：
@Data
@ToString(callSuper = true)
@Accessors(chain = true)
@AllArgsConstructor
public class ResponseEntity<T> implements Serializable {
/**
* 状态码
*/
protected Integer status;
/**
* 提示信息
*/
protected String msg;
/**
* 错误描述
*/
protected String desc;
/**
* 返回数据
*/
protected T data;
public ResponseEntity() {
this.message = "操作成功";
this.status = 200;
}
}
2、全局异常处理
定义一些处理异常的方法，可以添加项目中自定义的一些异常
@RestControllerAdvice
@Component
@Slf4j
public class CustomExceptionAdivsor {
@ExceptionHandler(value = MethodArgumentNotValidException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
public ResponseEntity to400(MethodArgumentNotValidException e) {
ResponseEntity responseEntity = new ResponseEntity()
.setStatus(HttpStatus.BAD_REQUEST.value())
.setDesc(e.getMessage());
return responseEntity;
}
@ExceptionHandler(value = AuthorizationException.class)
@ResponseStatus(HttpStatus.FORBIDDEN)
public ResponseEntity to403(AuthorizationException e) {
ResponseEntity responseEntity = new ResponseEntity()
.setStatus(HttpStatus.FORBIDDEN.value())
.setDesc(e.getMessage());
return responseEntity;
}
@ExceptionHandler(RuntimeException.class)
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public ResponseEntity to500(RuntimeException e) {
ResponseEntity responseEntity = new ResponseEntity()
.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value())
.setDesc(e.getMessage());
return responseEntity;
}
@ExceptionHandler(value = Throwable.class)
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public ResponseEntity to500(Throwable throwable) {
ResponseEntity responseEntity = new ResponseEntity()
.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value())
.setDesc(throwable.getMessage());
return responseEntity;
}
}
3、@RestControllerAdvice
@RestControllerAdvice 包含了 @ControllerAdvice 和 @ResponseBody
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@ControllerAdvice
@ResponseBody
public @interface RestControllerAdvice {
二、原理
在上一篇文章中分析过了
