JavaWebCookie的应用
package com.xzit.erpmodel.users.controller; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.xzit.erpmodel.users.domain.SysUsers; import com.xzit.erpmodel.users.service.UsersService; import com.xzit.erpmodel.users.service.UsersServiceImp; /** * Servlet implementation class UsersServlet */ @WebServlet("/UsersServlet") public class UsersServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response) */ protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* 获取用户提交的登录信息 */ String name = request.getParameter("username"); String pwd = request.getParameter("password"); String savepwd = request.getParameter("savepwd"); SysUsers user = new SysUsers(); user.setName(name); user.setPassword(pwd); UsersService service = new UsersServiceImp(); SysUsers current = service.validateLogin(user); if(current !=null) {//用户登录成功 Cookie[] cookies = request.getCookies();//获取用户未过期的所有Cookie if(cookies != null && cookies.length !=0) {//有Cookie int count = 0; //计数器 for(int i=0;i<cookies.length;i++) {//遍历数组查找目标Cookie if(cookies[i].getName().equals("logininfo") || cookies[i].getName().equals("logininfo2")) {//如果找到了目标有效的Cookie if(savepwd == null) { cookies[i].setMaxAge(0);//不保存Cookie response.addCookie(cookies[i]); } count++; } } if(count == 0) {//没有找到Cookie if(savepwd != null && savepwd.equals("on")) {//用户欲保存密码及用户信息 Cookie newCookie = new Cookie("logininfo",name); Cookie newCookie2 = new Cookie("logininfo2",pwd); newCookie.setMaxAge(3600*24*7);//设置Cookie的生命周期为7天 newCookie2.setMaxAge(3600*24*7);//设置Cookie的生命周期为7天 response.addCookie(newCookie); response.addCookie(newCookie2); } } }else { if(savepwd != null && savepwd.equals("on")) {//用户欲保存密码及用户信息 Cookie newCookie = new Cookie("logininfo",name); Cookie newCookie2 = new Cookie("logininfo2",pwd); newCookie.setMaxAge(3600*24*7);//设置Cookie的生命周期为7天 newCookie2.setMaxAge(3600*24*7);//设置Cookie的生命周期为7天 response.addCookie(newCookie); response.addCookie(newCookie2); } } //将用户对象存储到会话域中 HttpSession sess = request.getSession();//如果有Session直接返回，没有则创建新的Session对象 sess.setAttribute("currentUser", current); response.sendRedirect("worker.jsp"); }else { response.sendRedirect("login.jsp?loginfaild=error");//登录失败跳转到登录页面 } } }
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" session="false"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="UsersServlet" method="post"> <%! String uname = ""; String upwd = ""; %> <% Cookie []cookies = request.getCookies(); if(cookies !=null && cookies.length>0){ for(int i=0;i<cookies.length;i++){ if(cookies[i].getName().equals("logininfo")){ uname = cookies[i].getValue();//提取用户名 }else if(cookies[i].getName().equals("logininfo2")){ upwd = cookies[i].getValue();//提取密码 } } } %> 用户名称：<input name="username" value="<%=uname%>"><br> 登录密码：<input name="password" type="password" value="<%=upwd%>"> <input type="checkbox" name="savepwd" />保存密码 <br> <input name="login" value="登录" type="submit"> </form> <% String mess = request.getParameter("loginfaild"); if(mess != null && mess.equals("error")){ %> <label style="color:red">系统提示：用户名不存在或密码错误，登录失败</label> <% } %> </body> </html>
