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);

}

}