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JSP的Cookie在登录中的使用_JSP编程_
2023-05-25
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简介 JSP的Cookie在登录中的使用_JSP编程_
JSP的Cookie在登录中的使用
一 功能需求
实现记忆用户名和密码功能。
二 代码
1、login.jsp
<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>My JSP 'index.jsp' starting page 用户登录
<% request.setCharacterEncoding("utf-8"); String username=""; String password = ""; Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")) { username = URLDecoder.decode(c.getValue(),"utf-8"); } if(c.getName().equals("password")) { password = URLDecoder.decode(c.getValue(),"utf-8"); } } } %>
2、dologin.jsp
<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>My JSP 'dologin.jsp' starting page 登录成功
<% request.setCharacterEncoding("utf-8"); //首先判断用户是否选择了记住登录状态 String[] isUseCookies = request.getParameterValues("isUseCookie"); if(isUseCookies!=null&&isUseCookies.length>0) { //把用户名和密码保存在Cookie对象里面 String username = URLEncoder.encode(request.getParameter("username"),"utf-8"); //使用URLEncoder解决无法在Cookie当中保存中文字符串问题 String password = URLEncoder.encode(request.getParameter("password"),"utf-8"); Cookie usernameCookie = new Cookie("username",username); Cookie passwordCookie = new Cookie("password",password); usernameCookie.setMaxAge(864000); passwordCookie.setMaxAge(864000);//设置最大生存期限为10天 response.addCookie(usernameCookie); response.addCookie(passwordCookie); } else { Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")||c.getName().equals("password")) { c.setMaxAge(0); //设置Cookie失效 response.addCookie(c); //重新保存。 } } } } %>查看用户信息
3、users.jsp
<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>My JSP 'users.jsp' starting page 用户信息
<% request.setCharacterEncoding("utf-8"); String username=""; String password = ""; Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")) { username = URLDecoder.decode(c.getValue(),"utf-8"); } if(c.getName().equals("password")) { password = URLDecoder.decode(c.getValue(),"utf-8"); } } } %>
用户名：<%=username %>
密码：<%=password %>
三 测试
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