怎么在struts2中加入ajax验证

红酒&电影 2010-08-14 02:49:07

不知道怎么就是不能成功验证

login.jsp



<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>登录</title>

    <script type="text/javascript">

    	var xmlHttp;

    	function createXMLHttpRequest(){

    		if(window.ActiveXObject){

    			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

    		}else if(window.XMLHttpRequest){

    			xmlHttp = new XMLHttpRequest();

    		}

    	}

    

    	function check(){

    		var userName = document.getElementById('userName').value;

    		var password = document.getElementById('password').value;

    		

    		if(userName==""){

    			alert('用户名不能为空!');

    		}else if(password==""){

    			alert('密码不能为空!');

    		}else{

    			createXMLHttpRequest();

	    		xmlHttp.onreadystatechange = processor;

	    		xmlHttp.open("post", "loginAction.action");

	    		xmlHttp.send(null);

    		}

    	}

    	

    	function processor(){

    		var backNews;

    		if(xmlHttp.readyState==4){

    			if(xmlHttp.status==200){

    				backNews = xmlHttp.responseText;

    				alert(backNews.indexOf("false"));

    				if(backNews.indexOf("false")!=-1){

    					alert('用户名不存在！');

    				}else if(backNews.indexOf("true")!=-1){

    					alert('密码不正确！');

    				}

    			}

    		}

    	}

    </script>

  </head>

  

  <body style="text-align: center">

    <form action="loginAction.action" method="post" name="loginForm">

    	<table>

    		<tr>

    			<th align="right">用户名：</th>

    			<td><input name="users.userName" id="userName" type="text"/></td>

    		</tr>

    		<tr>

    			<th align="right">密码：</th>

    			<td><input name="users.password" id="password" type="text"/></td>

    		</tr>

    		<tr>

    			<td colspan="3" align="center">

    				<input type="button" value="登录" onclick="check()" >

    			</td>

    		</tr>

    	</table>

    </form>

  </body>

</html>

loginAction.java



public class LoginAction extends ActionSupport {

	private IBean ibean;

	private String backNews;

	private Users users;

	

	public String execute(){

		backNews = ibean.loginBean(users);

		return "success";

	}



	public IBean getIbean() {

		return ibean;

	}



	public void setIbean(IBean ibean) {

		this.ibean = ibean;

	}



	public String getBackNews() {

		return backNews;

	}



	public void setBackNews(String backNews) {

		this.backNews = backNews;

	}



	public Users getUsers() {

		return users;

	}



	public void setUsers(Users users) {

		this.users = users;

	}

}

daos.java



public String loginDao(Users users) {

		List list = getHibernateTemplate().find("from Users u where u.userName=?", users.getUserName());

		String password = null;

		String backNews = null;

		boolean b = false;

		if(list.size()>0){

			for(int i=0;i<list.size();i++){

				password = ((Users)list.get(i)).getPassword();

				if(password.equals(users.getPassword())){

					b = true;

					break;

				}

			}

			if(!b){

				backNews = "true";

			}

		}else{

			backNews = "false";

		}

		return backNews;

	}