Spring Boot教程九：捕获全局异常（二）

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1、在执行@RequestMapping时，进入逻辑处理阶段前。譬如传的参数类型错误

@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler{
   
    /**
     * 在controller里面内容执行之前，校验一些参数不匹配啊，Get post方法不对啊之类的
     */
    @Override
    protected ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
        return new ResponseEntity<Object>(new ApiResult(ResultCode.METHOD_NOT_ALLOWED.getCode(),ResultMessage.METHOD_NOT_ALLOWED.getMessage()), status);

    }

}

2、在进入Controller之前，譬如请求一个不存在的地址，404错误。

@RestController
public class FinalExceptionHandler implements ErrorController {

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

   @RequestMapping(value = "/error")
   @ResponseBody
   public ApiResult error(HttpServletResponse resp, HttpServletRequest req) {
      // 错误处理逻辑
      return new ApiResult(ResultCode.NO_URL.getCode(),ResultMessage.NO_URL.getMessage());
   }

}