本文實例為大家分享了jsp實現簡單用戶7天內免登錄的具體代碼，供大家參考，具體內容如下
（1）登陸頁面：login.jsp
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
!DOCTYPE html>
html>
head>
meta charset="utf-8">
title>Insert title here/title>
/head>
body>
form action="LoginServlet" method="post">
用戶名：input type="text" name="username" value="${cookie.cook_name.value }"/>br/>
input type="checkbox" name="chkCookie" value="7"/>記住我，7天內免登錄br/>
input type="submit" value="登錄"/>br/>
a href="sessionUser.jsp" rel="external nofollow" >驗證session/a>
a href="cookieUser.jsp" rel="external nofollow" >驗證cookie/a>
/form>
/body>
/html>
（2）跳轉頁面：cookieUser.jsp
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
!DOCTYPE html>
html>
head>
meta charset="utf-8">
title>Insert title here/title>
/head>
body>
%
//從瀏覽器獲取cookie
Cookie[] cookies = request.getCookies();
String uname = null;
//判斷語句條件小技巧
if(null != cookies){
for(Cookie cookie:cookies){
//遍歷本地瀏覽器中的所有cookie
if(cookie.getName().equals("cook_name")){
//把cookie中的用戶名取出
uname = cookie.getValue();
}
//out.print("p>name: " + cookie.getName()+"/p>");
//out.print("p>value: " + cookie.getValue()+"/p>");
}
}
//判斷cookie有沒有失效
if(null != uname){
out.print("p>用戶名："+uname +"/p>");
}
else{
response.sendRedirect("login.jsp");
}
%>
/body>
/html>
（3）Servlet文件：LoginServlet類
package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//獲取用戶登錄名
String username = request.getParameter("username");
//獲取7天內是否免登錄
String day7 = request.getParameter("chkCookie");
int cookie_day = 1;
if(null != day7 day7.equals("")){
cookie_day = Integer.valueOf(day7);
}
//創建cookie
Cookie cookie = new Cookie("cook_name",username);
//設置Cookie有限期
//cookie.setMaxAge(6);//有效期6秒
cookie.setMaxAge(3600 * 24 * cookie_day);//設置7天免登錄
//寫入cookie到瀏覽器
response.addCookie(cookie);
response.sendRedirect("cookieUser.jsp");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
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