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Cookie的用法

2015-07-01 18:55 302 查看

在登录的时候总是要填写用户名和密码，这样有时觉得繁琐，想要浏览器记住我的用户名和密码，可以通过cookie的方式实现：

package com.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.servlet.ServletException;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginServlet2 extends HttpServlet {

   public void doGet(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

           doPost(request,response);

   }



   public void doPost(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

       //处理中文乱码

       request.setCharacterEncoding("utf-8");

       response.setCharacterEncoding("utf-8");

       response.setContentType("text/html");

       PrintWriter out = response.getWriter();

       out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

       out.println("<HTML>");

       out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");

       out.println(" <BODY>");

       //获得提交的数据



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

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

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



       //获得时间

       Date ti=new Date();

       //转换时间格式

       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

       String datetime=sdf.format(ti);

       //定义有效期

               int i=0;

               if(times.equals("1")){

                   i=24*60*60;

               }else if(times.equals("2")){

                   i=24*60*60*7;

               }else if(times.equals("3")){

                   i=24*60*60*30;

               }else if(times.equals("4")){

                   i=24*60*60*365;

               }else if(times.equals("5")){

                   i=Integer.MAX_VALUE;

               }else{

                   response.getWriter().print("<scipt>alert('ERROR');history.back();</scipt>");

               }

               //将name,pass.times保存到coike

               Cookie cookieName=new Cookie("name",name);

               Cookie cookiePass=new Cookie("pass",pass);

               //Cookie cookieDatetime=new Cookie("datetime",datetime);

               Cookie cookieTimes=new Cookie("times",datetime);

               cookieTimes.setMaxAge(i);

               response.addCookie(cookieName);

               response.addCookie(cookiePass);

               response.addCookie(cookieTimes);

       //获得所有的cookie

       Cookie AllCookie[]=request.getCookies();



       for(int j=0;j<AllCookie.length;j++){

           if(!"JSESSIONID".equalsIgnoreCase(AllCookie[j].getName())){

               if(name.equals("")||pass.equals("")){

                   response.getWriter().print("<script>alert('ERROE');history.back();</script>");

               }else{

                   if("name".equalsIgnoreCase(AllCookie[j].getName()))

                       out.print("登录名："+AllCookie[j].getValue());

                   if("pass".equalsIgnoreCase(AllCookie[j].getName()))

                       out.print("密码："+AllCookie[j].getValue());

                   if("times".equalsIgnoreCase(AllCookie[j].getName()))

                       out.print("登录时间："+AllCookie[j].getValue());

               }

           }

       }

       out.println(" </BODY>");

       out.println("</HTML>");

       out.flush();

       out.close();

   }

   /**

   * Initialization of the servlet. <br>

   *

   * @throws ServletException if an error occurs

   */

   public void init() throws ServletException {

       // Put your code here

   }

}

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