Author：zhenghuiLogin.jsp<%@page language="java"import="java.util.*"pageEncoding="utf-8"%> <%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.get ServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>struts中使用ajax技術</title><meta http-equiv="Content-Type"content="text/html; charset=utf-8"/><link rel="stylesheet"type="text/css"href="css/style.css"><script type="text/javascript">function trim(str){ //删除左右两端的空格return str.replace(/(^\s*)|(\s*$)/g, "");}</script><script type="text/javascript">function ajaxLogin(){var xmlhttp;var text;var username=document.getElementById("username").value;var password=document.getElementById("password").value;//检测是否为空可以将其交给前台处理;if(username.length==0){alert("用户名不能为空");return false;}else if(password.length==0){alert("密码不能为空");return false;}if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safarixmlhttp=new XMLHttpRequest();}else{// code for IE6, IE5xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}xmlhttp.onreadystatechange=function(){if (xmlhttp.readyState==4 && xmlhttp.status==200){text=xmlhttp.responseText;if(trim(text)=="success"){alert("登陆成功!");window.location.href="home.jsp";}else{alert("登录失败，请重新登陆");}}}xmlhttp.open("POST","UserAction_ajaxLogin.action?ername="+ username+"&user.password="+password,true);xmlhttp.send();}</script></head><body><form name="form"><input type="text"id="username"name="ername"/><input type="password"id="password"name="user.password"/><input id="submit"type="submit"value="submit"onclick="ajaxLogin()"/></form></body></html>User.javapackage blog.model;public class User {private int id;private String username;private String password;public void setId(int id) {this.id = id;}public int getId() {return id;}public void setPassword(String password) { this.password = password;}public String getPassword() {return password;}public void setUsername(String username) { ername = username;}public String getUsername() {return username;}}UserAction.javapackage blog.action;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import er;import erService;import com.opensymphony.xwork2.ActionSupport;@SuppressWarnings("serial")public class UserAction extends ActionSupport {private UserService userService = new UserService();private User user;@Overridepublic String execute() throws Exception {// TODO Auto-generated method stubreturn super.execute();}public String ajaxLogin() throws Exception {try {String responseText = null;//logincheck(User user)根据传入的user，查询是否已经存在返回boolean;if (userService.logincheck(user)) {//以下隔开的是登陆的同时将登陆者的信息放进session里面;///////////////////////////////////////////////////////////////////getUserbyName(String username),根据传入的名字查询该对象出来user = userService.getUserbyName(user.getUsername());HttpSession httpSession = ServletActionContext.getRequest()s.getSession();System.out.println(user.getUsername()+ user.getPrivilege().getId());httpSession.setAttribute("username",user.getUsername());httpSession.setAttribute("privilege_id",user.getPrivilege().getId());httpSession.setAttribute("user_id", user.getId());///////////////////////////////////////////////////////////////// responseText = "success";} else {System.out.println("fail");responseText = "fail";}// 取得当前原始的PrintWriter对象,以便于直接输出响应结果,而不用跳转到某个视图;HttpServletResponse response = ServletActionContext.getResponse();response.setCharacterEncoding("utf-8");response.setContentType("text/plain");PrintWriter out = response.getWriter();out.println(responseText);out.flush();out.close();} catch (IOException e) {e.printStackTrace();}return null;}public User getUser() {return user;}public void setUser(User user) {er = user;}}Struts.xml<?xml version="1.0"encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN""/dtds/struts-2.1.dtd"><struts><package name="action"extends="struts-default"><action name="*_*"class="blog.action.{1}"method="{2}"> <result></result></action></package></struts>仅供参考，仅供参考。