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[网页设计]servlet方式通过Cookie记住登录时的用户名和密码


1.建立web工程

2.创建存放servlet的包

 

3右键包,新建servlet,路径将前面的servlet去掉,只需要doPost和doGet方法

编写servlet

CookieServlet.java代码如下:

package test1029;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CookieServlet extends HttpServlet {  public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {    this.doPost(request, response);  }  public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {    response.setContentType("text/html");        String uname=request.getParameter("uname");    String password=request.getParameter("password");    String ck=request.getParameter("ck");        //被选中的状态是on 没有被选中的状态下是null    if("on".equals(ck)){    //构造Cookie对象    //添加到Cookie中    Cookie c=new Cookie("users", uname+"-"+password);        //设置过期时间    c.setMaxAge(600);        //存储    response.addCookie(c);  }  }}

 

配置文件web.

<??><web-app ="http://www.w3.org/2001/ ="http://java.sun.com/ xsi:schemaLocation="http://java.sun.com/ id="WebApp_ID" version="2.5"> <display-name>test1029</display-name> <servlet>  <description>This is the description of my J2EE component</description>  <display-name>This is the display name of my J2EE component</display-name>  <servlet-name>CookieServlet</servlet-name>  <servlet-class>test1029.CookieServlet</servlet-class> </servlet> <servlet-mapping>  <servlet-name>CookieServlet</servlet-name>  <url-pattern>/CookieServlet</url-pattern> </servlet-mapping> <welcome-file-list>  <welcome-file>index.html</welcome-file>  <welcome-file>index.htm</welcome-file>  <welcome-file>index.jsp</welcome-file>  <welcome-file>default.html</welcome-file>  <welcome-file>default.htm</welcome-file>  <welcome-file>default.jsp</welcome-file> </welcome-file-list></web-app>

index.jsp代码:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%//el表达式String names="";String pwd="";//取出CookieCookie [] c=request.getCookies();for(int i=0;i<c.length;i++){  if(c[i].getName().equals("users")){    //存着数据(用户名+密码)    names=c[i].getValue().split("-")[0];    pwd=c[i].getValue().split("-")[1];        //再一次的存起来(备用)    request.setAttribute("xingming",names);    request.setAttribute("mima", pwd);  }} %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head>  <base href="<%=basePath%>">    <title>My JSP 'index.jsp' starting page</title>  <meta http-equiv="pragma" content="no-cache">  <meta http-equiv="cache-control" content="no-cache">  <meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  <meta http-equiv="description" content="This is my page">  <!--  <link rel="stylesheet" type="text/css" href="styles.css">  --> </head>  <body>  <form action="CookieServlet" method="post">    用户名:<input type="text" name="uname" id="uname" value="${xingming}"/><br>    密码:<input type="password" name="password" id="password" value="${mima }"/><br>    <input type="checkbox" name="ck">记住用户名和密码<br>    <input type="submit" value="登录">  </form> </body></html>

效果图:

1、项目运行之后,先进入登录界面,填写用户名和密码,效果如下图

 

2.登录后:

 

 

3.重新访问登录页面,效果如下: