struts2學習筆記--使用struts2插件實現ajax處理(返回json數據)

  貼一個簡單的例子,經過jquery的post調用action,定義一個對象User,有name和age屬性,實例化幾個對象,以json的格式返回到jsp,在前臺頁面顯示出來,模擬用戶列表.javascript

  •   導入相關jar包:
  1. ezmorph-1.0.6.jar
  2. json-lib-2.3-jdk15.jar
  3. struts2-json-plugin-2.3.16.1.jar
  • Action代碼:
package com.wang.action; import java.util.ArrayList; import java.util.List; import com.opensymphony.xwork2.Action; import com.wang.entity.User; import net.sf.json.JSONArray; public class JsonAction { private JSONArray root; public String execute(){ List<User> list=new ArrayList<User>(); list.add(new User("wang",20)); list.add(new User("yong",22)); list.add(new User("guo",23)); root=JSONArray.fromObject(list); System.out.println("json="+root.toString()); return Action.SUCCESS; } public JSONArray getRoot() { return root; } public void setRoot(JSONArray root) { this.root = root; } }
  •  jsp頁面:
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'ajax.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!-- <link rel="stylesheet" type="text/css" href="styles.css"> -->
    <script type="text/javascript" src="jquery/jquery.min.js"></script>
    <script type="text/javascript"> $(function(){ $('#btn1').click(function(){ $.post("json.action",function(data){ var html=""; for(var i=0;i<data.length;i++){ html+="<tr><td>"+data[i].name+"</td><td>"+data[i].age+"</td></tr>"; } $('#content').html(html); }); }); $('#btn2').click(function(){ // alert("a");
 $('#content').css("display","none"); }); }); </script>
  </head>
  
  <body>
    <input type="button" name="btn" id="btn1" value="獲取json"/><br>
    <table width="80%" align="center">
        <tr>
            <td>姓名</td>
            <td>年齡</td>
        </tr>
        <tbody id="content">
        
        </tbody>
    </table>
     <input type="button" name="btn" id="btn2" value="隱藏json信息"/><br>
  </body>
</html>
  • struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!--注意這裏繼承的json-default,間接地也繼承struts-default-->    
    <package name="default" extends="json-default" namespace="/">
        <action name="json" class="com.wang.action.JsonAction">
            <result type="json">
                <param name="root">root</param>
            </result>
        </action>
    </package>
</struts>    
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