Servlet 利用Cookie实现一周内不重复登录

import java.io.IOException;
import java.io.PrintWriter;

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;
/*
* 利用Cookie实现一周内不重复登录
*/
/**
* Servlet implementation class CookieLoginServlet
*/
@WebServlet("/CookieLoginServlet.do")
public class CookieLoginServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public CookieLoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       doPost(request, response);
   }

/**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       response.setContentType("text/html;charset=utf-8");

       //获取Cookie

       Cookie[] allCookies = request.getCookies();

       if (allCookies!=null) {
           String userName = null;
           String password= null;
           //获取Cookie中保存的用户名和密码
           for (int i = 0; i < allCookies.length; i++) {
               if (allCookies[i].getName().equals("userName")) {
                   userName = allCookies[i].getValue();
               }
               if (allCookies[i].getName().equals("password")) {
                   password = allCookies[i].getValue();
               }
           }
           if (userName!=null&&password!=null) {
               PrintWriter out = response.getWriter();

               out.println("<html>");
               out.println("<head>");
               out.println("<meta charset=\"UTF-8\">");
               out.println("<TITLE>登录成功</TITLE>");
               out.println("</head>");
               out.println("<body>");
               out.println("<H1>用户登陆成功</H1>");
               out.println("<H1>用户登录名:"+userName+"</H1>");
               out.println("</body>");
               out.println("</html>");
               out.close();
           }
           return;
       }

       String userName = request.getParameter("userName");
       String password = request.getParameter("password");

       if (userName==null||password==null) {
           PrintWriter out = response.getWriter();

           out.println("<html>");
           out.println("<head>");
           out.println("<meta charset=\"UTF-8\">");
           out.println("<TITLE>登录成功</TITLE>");
           out.println("</head>");
           out.println("<body>");
           out.println("<H1>用户登陆成功</H1>");
           out.println("<form action='CookieLoginServlet.do' method='post'>");
           out.println("用户名：<input type=text name=userName><br><br>");
           out.println("密码：<input type=password name=password><br><br>");
           out.println("<input type=checkbox name=keep value = 2>保存登录信息<br><br>");
           out.println("<input type=submit value=登录><br><br>");
           out.println("</body>");
           out.println("</html>");
           out.close();
       }else {
           //判断复选框是否被选中

           String keep = request.getParameter("keep");

           if (keep!=null) {
               //实例化Cookie对象
               Cookie userNameCookie = new Cookie("userName", userName);
               Cookie passwordCookie = new Cookie("password", password);
               //设置cookie一周后失效
               userNameCookie.setMaxAge(7*24*3600);
               passwordCookie.setMaxAge(7*24*3600);
               //将cookie信息返回给客户端浏览器
               response.addCookie(userNameCookie);
               response.addCookie(passwordCookie);
           }
           response.sendRedirect("success.html");
       }


   }

}

//success.html页面信息

</html>

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Servlet 利用Cookie实现一周内不重复登录

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