Cookie的用法

来源：互联网发布：怎么查看电脑ip端口编辑：程序博客网时间：2024/06/11 04:02

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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