jQuery+json makes Ajax calling function (with code)

This time I will bring you jQuery json to make Ajax calling function (with code). What are the precautions for jQuery json to make Ajax calling function. The following is a practical case, let’s take a look.

Userservlet.java code:

package com.iss.servlet;
import org.json.JSONException;
import org.json.JSONObject;
import com.iss.pojo.User;
import com.iss.util.JSONUtil;
public class UserServlet extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  doPost(request, response);
 }
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  response.setContentType("text/html;charset=utf-8");
  //list 添加对象
  List<user> userList = new ArrayList<user>();
  User user1 = new User("张三", "男", "18");
  User user2 = new User("李四", "男", "19");
  User user3 = new User("王五", "男", "20");
  userList.add(user1);
  userList.add(user2);
  userList.add(user3);
  PrintWriter out = response.getWriter();
  String str = null;
  try {
   //帐号密码如果匹配则把list 返回给界面
   if (request.getParameter("userName").equals("jquery")
     && request.getParameter("password").equals("ajax")) {
    str = JSONObject.quote(JSONUtil.toJSONString(userList));
   }
   out.print(str);
  } catch (JSONException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println("str "+str);
  out.flush();
  out.close();
 }
}</user></user>

Html code:

 帐号 jquery 密码 ajax
 

  

   
•     帐号         
   
•     密码         
   
•         
  

 

 查询到的数据  

 

 <script> function login(){ //获取form的参数 var args =$("#mainform").serialize(); //调用 jquery 的json获取方法 //三个参数分别为 ：请求路径 ，请求参数，返回数据的回调函数 $.getJSON("servlet/UserServlet",args,function (data){ if(data!=null){ // 界面返回的是一个json格式字符串 调用JSON.parse()把数据转化为json // 格式的对象 var jsondata =JSON.parse(data); parseData(jsondata); }else{ alert("帐号密码输入有误"); } }) } function parseData(data){ var str=""; //遍历json格式数据 for (var key in data){ strstr =str+" 用户"+data[key].userName+" 年龄"+data[key].age+"<br/>" alert(str); } //把数据添加到p中 $("#pa").html(str); } </script>

UserServlet Remember to import the tool class JSONStringObject JSONUtil

jsp To import jquery.js and json .js

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of python reading and writing json files (with code)

Case using JSONP induction

The above is the detailed content of jQuery+json makes Ajax calling function (with code). For more information, please follow other related articles on the PHP Chinese website!