BindingResult

BindingResult是用於接收前一個參數校驗(validate或valid)錯誤信息, 前端將不再顯示錯誤信息
statusCode == 200, 后端也不會拋出異常

如果想要跳轉到錯誤頁面, 使用@ResponseStatus指定code和reason, 或是拋出一個異常

    @ResponseStatus(value = HttpStatus.BAD_REQUEST, reason = "參數請求錯誤")
    @ResponseBody
    @RequestMapping("/test2")
    public String test2(@Validated User user, BindingResult result) {
        //判斷是否有error
        if (result.hasErrors()) {
            int errorCount = result.getErrorCount();
            log.info("異常個數=" + errorCount);
            //獲取全局與屬性的錯誤
            //result.getAllErrors();
            //只獲取屬性校驗的錯誤
            for (FieldError fieldError : result.getFieldErrors()) {
                log.info("message:" + fieldError.getDefaultMessage());
            }
        }
        System.out.println(user);
        return "test2";
    }

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將校驗的錯誤信息返回到前端

    @ResponseBody
    @RequestMapping("/test4")
    public Map<String, Object> test5(@Validated User user, BindingResult result) {
        Map<String, Object> model = null;
        if (result.hasErrors()) {
            model = result.getModel();
        }
        System.out.println(user);
        return model;
    }