Spring MVC中异常处理的三种方式

public class AppHandlerExceptionResolver implements HandlerExceptionResolver {
 @Override
 public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
  ModelAndView mav = new ModelAndView();
  mav.addObject("message", ex.getMessage());
  // 可以设置视图名导向错误页面
  mav.setViewName("/error");
  // 直接返回视图
  // 如果返回 null，则会调用下一个 HandlerExceptionResolver
  return mav;
 }
}

@Bean
public AppHandlerExceptionResolver appHandlerExceptionResolver() {
 return new AppHandlerExceptionResolver();
}

// 可以配置拦截指定的类或者包等
// @RestControllerAdvice 使 @ExceptionHandler 注解的方法默认具有 @ResponseBody 注解
@RestControllerAdvice(basePackageClasses = HelloWorldController.class)
public class AppExceptionHandlerAdvice {

 // 配置拦截的错误类型
 // 这里也可以返回 ModelAndView 导向错误视图
 @ExceptionHandler(Exception.class)
 public ResponseEntity<Object> responseEntity(Exception e) {
  HttpHeaders headers = new HttpHeaders();
  headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
  Map<String, Object> map = new HashMap<>();
  map.put("status", 400);
  map.put("message", e.getMessage());
  // 直接返回结果
  return new ResponseEntity<>(map, headers, HttpStatus.BAD_REQUEST);

 }
}

@RestController
@RequestMapping("/error")
public class AppErrorController extends AbstractErrorController {

 public AppErrorController(ErrorAttributes errorAttributes) {
  super(errorAttributes);
 }

 @RequestMapping
 public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
  Map<String, Object> body = getErrorAttributes(request, false);
  HttpStatus status = getStatus(request);
  // 返回响应体
  return new ResponseEntity<>(body, status);
 }

 @Override
 public String getErrorPath() {
  return "/error";
 }
}