<%@ page language="java" contentType="text/html; charset=UTF-8" ???pageEncoding="UTF-8"%><!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 method="post" action="doLogin.jsp"><p>用户名：<input type="text" name="userName"/></p><p>密码：<input type="password" name="pwd"/></p><p><input type="submit" name="Submit"/></p></form></body></html>
<%@ page language="java" contentType="text/html; charset=UTF-8" ???pageEncoding="UTF-8"%><!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> ???<% ???String name=request.getParameter("userName"); ???Cookie newCookie=new Cookie("user",name); ???newCookie.setMaxAge(10);//有效期20秒 ???response.addCookie(newCookie); ???response.sendRedirect("welcome.jsp"); ???%></body></html><%@ page language="java" contentType="text/html; charset=UTF-8" ???pageEncoding="UTF-8"%><!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> ???<% ???Cookie[] cookies=request.getCookies(); ???String name=null; ???if(cookies!=null){ ???????for(int i=0;i<cookies.length;i++){ ???????????if(cookies[i].getName().equals("user")){ ???????????????name=cookies[i].getValue(); ???????????} ???????} ???}else{ ???????response.sendRedirect("Login.jsp"); ???} ???????if(name==null){ ???????response.sendRedirect("Login.jsp"); ???} ???out.print("您好！"+name+"欢迎您"); ???%> ???</body></html>JSP代码实现简易的登入操作并进行验证账户非活动时间的有效时长
原文地址：https://www.cnblogs.com/chongsheng456-com/p/8994685.html