サーブレットの簡単なクッキーの例

package com.mkyong;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletDemo extends HttpServlet{

    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws IOException{

        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();

        Cookie cookie = new Cookie("url","mkyong dot com");
        cookie.setMaxAge(60** 60);//1 hour
        response.addCookie(cookie);

        pw.println("Cookies created");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp__ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app__2__4.xsd">

    <display-name>servletdemo</display-name>

    <servlet>
        <servlet-name>ServletName</servlet-name>
        <servlet-class>com.mkyong.ServletDemo</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>ServletName</servlet-name>
        <url-pattern>/Demo</url-pattern>
    </servlet-mapping>

</web-app>