struts2+ajax实现异步刷新

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <%
 3     String path = request.getContextPath();
 4     String basePath = request.getScheme() + "://"
 5             + request.getServerName() + ":" + request.getServerPort()
 6             + path + "/";
 7 %>
 8 
 9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
10 <html>
11     <head>
12         <base href="<%=basePath%>">
13 
14         <title>My JSP 'login.jsp' starting page</title>
15 
16         <meta http-equiv="pragma" content="no-cache">
17         <meta http-equiv="cache-control" content="no-cache">
18         <meta http-equiv="expires" content="0">
19         <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
20         <meta http-equiv="description" content="This is my page">
21         <!--
22     <link rel="stylesheet" type="text/css" href="styles.css">
23     -->
24 
25         <script type="text/javascript" src="js/jquery-1.8.3.js">
26 </script>
27     </head>
28     <script type="text/javascript">
29 function chkName() {
30     var name = $("#username").val();       
31     $.ajax( {
32         url : "chkName.action",
33         data : "name=" + name, //发送数据
34         dataType : "text", //响应数据类型  
35         type : "get", //请求发方式
36         success : function(value) { //成功之后        
37         $("#msg").html(value);
38     }
39     });
40     }    
41     </script>
42     <body>
43         <div id="show"></div>
44         <form action="login.action" method="post">
45             <div>
46                 用户名：
47                 <input name="username" type="text" value="" id="username"
48                     onblur="chkName()" />
49                 <span id="msg"></span>
50             </div>
51 
52             <input type="submit" value="提交" />
53         </form>
54     </body>
55 </html>

struts.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5     
 6 <struts>
 7   <package name="default"  extends="struts-default" namespace="/">
 8     <action name="chkName" class="com.yh.myajax.LoginAction" method="chkName">
 9       <result type="stream">
10         <param name="contentType">text/html;charset=utf-8</param>
11         <param name="inputName">is</param>
12       </result>
13     </action>
14   </package>
15  </struts>

LoginAction.java

 1 package com.yh.myajax;
 2 
 3 import java.io.ByteArrayInputStream;
 4 import java.io.InputStream;
 5 import java.io.UnsupportedEncodingException;
 6 
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class LoginAction extends ActionSupport {
10     private String name;
11     private InputStream is;   
12     public String chkName(){
13         String text;
14         if("sa".equals(name)){
15             text="用户已存在！";
16         }else{
17             text="此用户可用！";
18         }
19         try {
20             this.is=new ByteArrayInputStream(text.getBytes("utf-8"));
21         } catch (UnsupportedEncodingException e) {
22             // TODO Auto-generated catch block
23             e.printStackTrace();
24         }
25         return SUCCESS;       
26     }   
27     public String getName() {
28         return name;
29     }
30     public void setName(String name) {
31         this.name = name;
32     }
33     public InputStream getIs() {
34         return is;
35     }
36     public void setIs(InputStream is) {
37         this.is = is;
38     }   
39 }

web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 4  <filter>
 5   <filter-name>struts2</filter-name>
 6   <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 7  </filter>
 8  <filter-mapping>
 9   <filter-name>struts2</filter-name>
10   <url-pattern>/*</url-pattern>
11  </filter-mapping>
12  <welcome-file-list>
13   <welcome-file>index.jsp</welcome-file>
14  </welcome-file-list>
15  <login-config>
16   <auth-method>BASIC</auth-method>
17  </login-config>
18 </web-app>

需要加载的包

运行效果