报错： Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported]

 控制台报如下消息提示：

Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported]

2019-09-11 22:48:32.829  WARN 12904 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported]
2019-09-11 22:49:26.551  WARN 12904 --- [nio-8080-exec-5] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported]

说明控制器已经接收到了请求，jquery没有设置

contentType或直接设置为application/x-www-form-urlencoded;charset=UTF-8

因为传递的json格式的对象，应设置为 contentType: 'application/json;charset=UTF-8'

            $.ajax({
                url: "login",
                type: "POST",
                data: data,
                dataType: "json",
                async: false,
                contentType:'application/x-www-form-urlencoded;charset=UTF-8',//设置前
                contentType:'application/json;charset=UTF-8',  //设置后
                success: function (result) {
                    var newData = JSON.stringify(result);    //将json对象转换为字符串
                    newData = eval("(" + newData + ")");   //解析json
                    var msg = newData.msg;
                    alert(msg);
                },
                error: function () {
                    alert("提交请求失败！");
                }
            });