ajax发送json数据的请求

前端

$(function () {
    $("#upload").click(function () {
      const name = $(":input[name='name']").val();
      const info = $(":input[name='info']").val();
      var clazz = {};
      clazz.name = name;
      clazz.info = info;
      $.ajax({
        url: "/t/insertClass",
        type: "post",
        data: JSON.stringify(clazz),
        contentType: "application/json",
        success: function(flag){
          if (flag) {
            alert("添加成功");
          } else {
            alert("添加失败");
          }
        }
      });
    });
  })

后台

  @RequestMapping("/insertRemark")
  @ResponseBody
  public Boolean insertRemark(HttpServletRequest request,@RequestParam String content){
      HttpSession session = request.getSession();
      Student student = (Student)session.getAttribute("user");
      student.settRemark(content);
      Example example = new Example(Student.class);
      Example.Criteria criteria = example.createCriteria();
      criteria.andEqualTo("id", new Long(student.getId()));
      example.and(criteria);
      int flag = studentMapper.updateByExampleSelective(student,example);
      return flag>0?true:false;
  }

可能出现的错误

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

解决

ajax请求中没写contentType: "application/json"