服务器端创建Cookie：
Win7默认Cookie位置
C:UsersAdministratorAppDataRoamingMicrosoftWindowsCookies
CookieTest1.java
//CookieTest1
package com.tsinghua;
import javax.servlet.http.*;
import java.io.*;
public class CookieTest1 extends HttpServlet{
public void doGet(HttpServletRequest req, HttpServletResponse res)
{
try{
//解决中文乱码
res.setCharacterEncoding("gbk");
PrintWriter pw = res.getWriter();
pw.println("<html>");
//当用户访问该Servlet时，就将信息创建到该用户的cookie中
//1.现在服务器端创建一个cookie
Cookie myCookie = new Cookie("color1","red");
//2.该cookie的存在时间
myCookie.setMaxAge(30);
//如果你不设置存在时间，那么该cookie将不会保存
//3.将该cookie写回到客户端
res.addCookie(myCookie);
pw.println("已经创建了cookie");
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
//处理get请求
//req用于获得客户端(浏览器)的信息
//res用于向 客户端(浏览器)返回信息
public void doPost(HttpServletRequest req, HttpServletResponse res)
{
this.doGet(req,res);
}
}
客户端读取Cookie
//如何读取Cookie案例 package com.tsinghua; import javax.servlet.http.*; import java.io.*; public class CookieTest2 extends HttpServlet{ public void doGet(HttpServletRequest req, HttpServletResponse res) { try{ //解决中文乱码 res.setCharacterEncoding("gbk"); PrintWriter pw = res.getWriter(); //客户端得到所有cookie信息 Cookie[] allCookies = req.getCookies(); int i = 0; //如果allCookie不为空 if(allCookies != null) { //从中取出cookie for (i = 0; i<allCookies.length; i++) { //依次取出 Cookie temp = allCookies[i]; if(temp.getName().equals("color1")) { //得到cookie的值 String val = temp.getValue(); pw.println("color1="+val); break; } } if(allCookies.length == i) { pw.println("cookie过期"); } }else { pw.println("不存在color1这个cookie/或者是过期"); } } catch(Exception ex) { ex.printStackTrace(); } } //处理get请求 //req用于获得客户端(浏览器)的信息 //res用于向 客户端(浏览器)返回信息 public void doPost(HttpServletRequest req, HttpServletResponse res) { this.doGet(req,res); } }