JsonParseException: Unrecognized token ‘username‘: was expecting表单提交登陆数据报错

客官°小女子只卖身不卖艺 2021-09-02 05:43 480阅读 0赞

## 1.问题追溯 ##

很长一段时间都在做前后端分离的vue案例，今天突然使用Thymeleaf提交表单登录到security登陆验证时一直报错  
JsonParseException: Unrecognized token ‘username’: was expecting  
但是使用Postman提交json数据时却没有问题，那我就可以确定是表单数据不能正确解析的问题

/** * 1.获取用户名和密码 */
        @Override
        public Authentication attemptAuthentication(HttpServletRequest req, HttpServletResponse res)
                throws AuthenticationException { 
            try { 
                User user = new ObjectMapper().readValue(req.getInputStream(), User.class);
                System.out.println("1.获取用户名和密码=="+user);
                return authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(user.getUsername(), user.getPassword(), new ArrayList<>()));
            } catch (IOException e) { 
                throw new RuntimeException(e);
            }
    
        }

报错位置：  
**User user = new ObjectMapper().readValue(req.getInputStream(), User.class);**

## 2.解决办法 ##

**JSON.stringify(formData)打包json数据**

$("button[type='button']").click(function () {
                var formData = {
                    username: $("#username").val(),
                    password: $("#password").val()
                };
                $.post("[[@{/}]]admin/login", JSON.stringify(formData),
                    function (data) {
                        alert("Data Loaded: " + data);
                    });
            });
    
        })

**我是这样就可以正常使用了，如果不行你还可以尝试：**

$.ajax({
                type: "POST",
                url: "xxxx",
                contentType:‘application/json;charset=utf-8‘,
                data:JSON.stringify(allData),
                success: function (data) {
                    alert(data);
                }
            });