JSP程式設計實現簡單使用者7天內免登入及示例程式碼

佚名發表於2020-06-03
JS程式設計

文章主要詳細介紹了jsp實現簡單使用者7天內免登入，文中示例程式碼介紹的非常詳細，感興趣的小夥伴們可以參考一下。

本文例項為大家分享了jsp實現簡單使用者7天內免登入的具體程式碼，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">
  使用者名稱：<input type="text" name="username" value="${cookie.cook_name.value }"/><br/>
  <input type="checkbox" name="chkCookie" value="7"/>記住我，7天內免登入<br/>
  <input type="submit" value="登入"/><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中的使用者名稱取出
    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>使用者名稱："+uname +"</p>");
   }
   else{
   response.sendRedirect("login.jsp");
   }
%>
</body>
</html>

（3）Servlet檔案：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
 //獲取使用者登入名
 String username = request.getParameter("username");
  
 //獲取7天內是否免登入
 String day7 = request.getParameter("chkCookie");
 int cookie_day = 1;
 if(null != day7 && day7.equals("")){
   
  cookie_day = Integer.valueOf(day7);
 }
  
 //建立cookie
 Cookie cookie = new Cookie("cook_name",username);
  
 //設定Cookie有限期
 //cookie.setMaxAge(6);//有效期6秒
 cookie.setMaxAge(3600 * 24 * cookie_day);//設定7天免登入
  
 //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JSP程式設計實現簡單使用者7天內免登入及示例程式碼的全部內容，希望對大家的學習有所幫助。

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