使用jQuery ajax + Struts 一个登陆的例子.
下面是一个Jsp页面的代码:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><script type="text/javascript" src="/jQuery/jQuery/jquery-1.2.6.pack.js"></script><%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> <script type="text/javascript"> /*** jQuery(function(){$("#user_name").blur(function(){var name= $.trim($("#user_name").val());$.ajax({url:"/jQuery/myServlet",data:{username:name},cache:false,success:function(data){if(data=="true"){alert("姓名可以使用!");}else{alert("姓名不能使用!");}}})})});***///提交;function checkSubmit(){var bol = true;var username = $.trim($("#user_name").val());var password = $.trim($("#password").val());if(username==null || username==""){$("#userDivId").show();$("#userDivId").html("用户名不能为空!");$("#msgDIVID").hide();$("#user_name").focus();bol= false;}else{$("#userDivId").hide();}if(password==null || password==""){$("#passDivId").show();$("#passDivId").html("密码不能为空!");$("#msgDIVID").hide();$("#password").focus();bol=false;}else{$("#passDivId").hide();}if(bol!=false){$.ajax({url:"/jQuery/login.do?p=loginCheck",data:{uname:username,upass:password},success:function(data){if(data=="1"){$("#msgDIVID").show();$("#msgDIVID").html("恭喜您,登录成功!");}else if(data=="2"){$("#msgDIVID").show();$("#msgDIVID").html("抱歉,由于你的账号或密码登录失败!");}}});}} </script> </head> <body > <form name="myform"> <table> <tr> <td>UserName:</td> <td><input type="text" id="user_name"></td> <td><div id="userDivId" style="border: 0px solid red;width:200px;height:10px;color: red"></div></td> </tr> <tr> <td>PassWord:</td> <td><input type="password" id="password" size="22" name="password" /></td> <td><div id="passDivId" style="border: 0px solid red;width:200px;height:10px;color: red;"></div></td> </tr> <tr> <Td><input type="reset"/ value="重置"></Td> <Td><button name="btnSubmit" onclick="checkSubmit()">提交</button></Td> </tr> </table> <Br> <!-- 显示登陆信息的div层. --> <div id="msgDIVID" style="border:0px solid blue;color: blue;width:400px;height:30;font-weight: bold;font-size: 20px"></div> </form> </body></html>?
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下面一个是Struts Action里面的代码:
/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */package pack.java.demo.struts.action;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import org.apache.struts.actions.DispatchAction;/** * MyEclipse Struts * Creation date: 11-04-2010 * * XDoclet definition: * @struts.action parameter="p" validate="true" */public class LoginAction extends DispatchAction {/** * 分发Action;验证登陆方法; * @param mapping * @param form * @param request * @param response * @return */public ActionForward loginCheck(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {//根据用户名请求;String username=request.getParameter("uname");//根据密码请求;String password=request.getParameter("upass");//因为没有连接数据库,就直接用用户名和密码;if(username.equals("zhouhaitao") && password.equals("123456")){try {response.getWriter().print("1");} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else{try {response.getWriter().print("2");} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}return null;}}?