Servlet课程0426（十）Servlet如何删除cookie

//如何删除Cookie案例
package com.tsinghua;

import javax.servlet.http.*;
import java.io.*;

public class CookieTest3 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"))
                {
                    //将该cookie删除，设置等于0这个cookie就被删除了
                    temp.setMaxAge(0);
                    pw.println("删除了color这个cookie");
                    break;
                }
            }
        }


        }
        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);

    }


}