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 添加對(duì)象
  List<User> userList = new ArrayList<User>();
  User user1 = new User("張三", "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 {
   //帳號(hào)密碼如果匹配則把list 返回給界面
   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();
 }
}

Html代碼：

<body>
 帳號(hào) jquery 密碼 ajax
 <form id="mainform">
  <ul>
   <li>
    帳號(hào)
    <input type="text" name="userName" />
   </li>
   <li>
    密碼
    <input type="password" name="password" />
   </li>
   <li>
    <input onclick="login()" type="button" value="登錄" />
   </li>
  </ul>
 </form>
 查詢到的數(shù)據(jù)
 <div id="diva">
 </div>
 <script type="text/javascript">
   function login(){
   //獲取form的參數(shù)
   var args =$("#mainform").serialize();
   //調(diào)用 jquery 的json獲取方法
   //三個(gè)參數(shù)分別為 ：請(qǐng)求路徑 ，請(qǐng)求參數(shù)，返回?cái)?shù)據(jù)的回調(diào)函數(shù)
   $.getJSON("servlet/UserServlet",args,function (data){
   if(data!=null){
   // 界面返回的是一個(gè)json格式字符串 調(diào)用JSON.parse()把數(shù)據(jù)轉(zhuǎn)化為json
   // 格式的對(duì)象
   var jsondata =JSON.parse(data);
   parseData(jsondata);
   }else{
   alert("帳號(hào)密碼輸入有誤");
   }
   })
   }
   function parseData(data){
   var str="";
   //遍歷json格式數(shù)據(jù)
   for (var key in data){
   strstr =str+" 用戶"+data[key].userName+" 年齡"+data[key].age+"<br/>"
   alert(str);
   }
   //把數(shù)據(jù)添加到div中
   $("#diva").html(str);
   }
  </script>
</body>

UserServlet 記得要導(dǎo)入工具類 JSONStringObject JSONUtil

jsp 要導(dǎo)入 jquery.js和 json.js

希望本文所述對(duì)大家jQuery程序設(shè)計(jì)有所幫助。

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