微信小程序使用post提交java后台

wx.request({
                url : "http://mall.vstob.com/public/checkWXMobileAndUserName",
                method: "POST",
                data: {
                 username:this.user,
                 mobile:this.phoneNum
                },
                header: {
                  "Content-Type": "application/x-www-form-urlencoded"
                },
                success: function (res) {
                  console.log(res.data);

                },
              })