servlet方式通过Cookie记住登录时的用户名和密码_html/css

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servlet方式通过Cookie记住登录时的用户名和密码_html/css_WEB-ITnose

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Jun 24, 2016 am 11:34 AM

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);    }    }}

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配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 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>

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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>

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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：

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