ajaxSubmit返回JSON格式

baijinswpu 2020-06-28

开发时遇到根据不同情况返回错误提示信息的需求,用到了ajax中返回json格式数据的。

前台请求代码:

   <script type="text/javascript">
        function login() {
            $.ajax({
            //几个参数需要注意一下
                type: "POST",//方法类型
                dataType: "json",//预期服务器返回的数据类型
                url: "login.action" ,//url
                data: $(‘#form1‘).serialize(),
                success: function (data) {
                    console.log(data);//打印服务端返回的数据(调试用)
                    if (ata.code ==200) {
                        alert("登录成功!");
                    }else{
                        alert("登陆失败!"+data.Msg);
                    }
                    ;
                }
            });
        }
    </script>

后台接收代码:

//验证登录
    @RequestMapping(value="/login",method=RequestMethod.POST,produces = "text/html;charset=UTF-8")
    @ResponseBody
    public void login(User user,HttpServletResponse response) throws IOException{
        JSONObject json=new JSONObject();
        if (user.getUpassword().equals("123")) {
            json.put("code", 200);
            json.put("Msg", "验证成功!");
        }else {
            json.put("code", 400);
            json.put("Msg", "密码错误");
        }
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");//防止乱码
        response.getWriter().print(json.toJSONString());
    }
后台controller中的方法使用时是返回的JSONObject类型,未使用注解,修改为

方法名: public JSONObjectlogin(User user,HttpServletResponse response)       返回值:return json

注:用到JSONObject()方法需引入6个jar包,不然会报java.lang.NoClassDefFoundError错误。

  1. <span>json<span>-<span>lib<span>-<span>2.4<span>-<span>jdk15<span>.<span>jar</span></span></span></span></span></span></span></span></span>
  2. <span>commons<span>-<span>beanutils<span>-<span>1.8<span>.<span>0.jar</span></span></span></span></span></span></span>
  3. <span>commons<span>-<span>logging<span>-<span>1.1<span>.<span>1.jar</span></span></span></span></span></span></span>
  4. <span>commons<span>-<span>collections<span>-<span>3.2<span>.<span>1.jar</span></span></span></span></span></span></span>
  5. <span>commons<span>-<span>lang<span>-<span>2.5<span>.<span>jar</span></span></span></span></span></span></span>
  6. <span>ezmorph<span>-<span>1.0<span>.<span>6.jar</span></span></span></span></span>


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原文链接:https://blog.csdn.net/weixin_42304232/java/article/details/89713452

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