亲测SpringBoot参数传递及@RequestBody注解---踩过的坑及解决

//点击查询, 执行下面这个函数
$("#searchByCriteria").click(function () {
     //var paramdata = $("#bck_qry_criteria_form").serializeJson();//serializeJson()是自定义的form 格式化为json函数
     var paramdata = {
         type:$("#bck_type").val(),
         title:$("#bck_title").val(),
         start:$("#bck_start").val(),
         end:$("#bck_end").val()
     };
     paramdata = JSON.stringify(paramdata);
     $.ajax({
         type: "post",
         data: paramdata,
         url: "/getNews",
         cache:false,
         headers : {"Content-Type" : "application/json;charset=utf-8"},
         success: function (data) {
             var code = data.code;
             var t = data.t;
             if (code == 200){alert(JSON.stringify("提交成功! 我们会尽快联系您!"));}
             if (code == 500){alert(JSON.stringify(t));}
             //$("#input_phone").val("");//清空输入框
         }
     })
 });

@PostMapping(value = "/getNews",  consumes = "application/json")
@ResponseBody
public PageInfo<NewsList> getNewsList(@RequestBody NewsParamsMap map){
    System.out.println("这是正确的用法");
    return null;
}

public class NewsParamsMap {
    private Integer type;
    private String title;
    private Date start;
    private Date end;
   ...
   set get 方法
   ...
}

@RequestMapping("doThis")  
public String doThis(HttpServletRequest request,  
        @RequestParam("id") Long id, // 用户ID  
        @RequestParam("back_url") String back_url, // 回调地址           
        @RequestBody TestEntity json_data // json数据，对于java实体类  
){//...  

String add_url = "http://127.0.0.1:8080/test/doThis";  
   URL url = new URL(add_url);  
   HttpURLConnection connection = (HttpURLConnection)url.openConnection();  
   connection.setDoInput(true);  
   connection.setDoOutput(true);  
   connection.setRequestMethod("POST");  
   connection.setUseCaches(false);  
   connection.setInstanceFollowRedirects(true);  
   connection.setRequestProperty("Content-Type","application/json");  
   connection.connect();  
   DataOutputStream out = new DataOutputStream(connection.getOutputStream());  
   JSONObject obj = new JSONObject();  
      
   obj.put("code", -1002);       
   obj.put("message", "msg");  
   out.writeBytes(obj.toString());  
   out.flush();  
   out.close();