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

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.xml

  test1029      This is the description of my J2EE component    This is the display name of my J2EE component    CookieServlet    test1029.CookieServlet        CookieServlet    /CookieServlet        index.html    index.htm    index.jsp    default.html    default.htm    default.jsp  

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                                            
        
        用户名:
        密码:
        记住用户名和密码
            
  

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：