求ajax与struts结合的实例。
想运用ajax技术，直接访问struts的action，在action中怎样返回？ 问题点数：20、回复次数：1Top
1 楼dearsn（）回复于 2006-07-05 16:47:31 得分 20
我也被这个问题困扰过，看看下面的这个例子你就明白了。
用ajax+struts实现用户名验证功能。
页面端：
<%@ page contentType="text/html; charset=gb2312" %>
<% request.setCharacterEncoding("gb2312"); %>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ taglib uri="/WEB-INF/jUtil.tld" prefix="jutil"%>
<%@ taglib uri="/WEB-INF/app.tld" prefix="app" %>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="javascript">
var xmlhttp ;
function chkUser()
{
window.status = '';
document.getElementById("load").style.display='';
if(window.ActiveXObject){
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}else if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
var url = "http://localhost/fiip/webapp/home.do?action=verdictuserName";
xmlhttp.onreadystatechange =getReady;
var name = document.getElementById("username").value;
url=url+"&userName="+name;
xmlhttp.open("GET",url);
xmlhttp.send(null);
}
function getReady()
{
if(xmlhttp.readyState == 4)// 完成
{
if(xmlhttp.status == 200)//ok 404not found
{
var xmlReturn = xmlhttp.responseText;//服务器的响应，表示一个串
//alert("sdfsdf");
document.getElementById("load").innerText=xmlReturn;//表现一组开始标记和结束标记之间的内容
//var responsediv=document.getElementById("load");
//var responsetext=document.createTextNode(xmlReturn);
//responsediv.appendChild(responsetext);
}
xmlhttp = null;
}
}
</script>
</head>
<body>
<form action="" method="post" name="form1">
<table width="564" border="0">
<tr>
<td width="89">用户名:</td>
<td width="465"><input name="username" type="text" id="username" onBlur="chkUser()"> <div id=load style="display:none; position:absolute;right:0px;top:0px;background:#FF5B5B;border:1px solid">正在验证用户名,请稍后……</div></td>
</tr>
<tr>
<td>密码:</td>
<td><input name="password" type="text" id="password"></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" name="Submit" value="提交">
<input type="reset" name="Submit2" value="重置"></td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td height="15"> </td>
<td> </td>
</tr>
</table>
</form>
</body>
</html>
struts-congfig.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<form-beans >
<form-bean name="homeForm" type="com.trsoft.home.HomeForm"/>
</form-beans>
<global-forwards>
</global-forwards>
<action-mappings>
<action path="/webapp/home"
type="com.trsoft.home.HomeAction"
name="homeForm"
scope="request"
validate="false">
<forward name="home" path="/webapp/homepage/homepage.jsp"/>
</action>
</action-mappings>
</struts-config>
程序实现:
import java.io.UnsupportedEncodingException;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
public class HomeAction extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws UnsupportedEncodingException{
request.setCharacterEncoding("gb2312");
String action=(String)request.getParameter("action");
String forward="";
/**
* @功能：判断用户是否已注册
*
* @参数：
* String username用户名
*
*
* @流程:
*
*/
else if("verdictuserName".equals(action)){
String msgStr="";
try{
response.setContentType("text/html;charset=GB2312");
String userName=(String)request.getParameter("userName");
System.out.println("userName = "+userName);
if("gong".equals(userName)){ //找查数据库中有无该用户名
msgStr ="对不起,此用户名已经存在,请更换用户名注册!";
}else{
msgStr ="用户未被注册,可以使用";
}
response.getWriter().write(msgStr);
}catch(Exception ex){
}
}
/**
* @功能：用户注册
*
* @参数：
* String username用户名
* String password 密码
*
* @流程:
*
*/
else if("register".equals(action)){
}
return mapping.findForward(forward);
}
}
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