Cookie 获取cookie

 Demo02:

package com.test.cookie;

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

/**
 * Servlet implementation class Demo02
 * 获取Cookie
 */
public class Demo02 extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//cookie的简单使用
		
		//cookie 发送给客户端,并且保存在客户端的一份小数据
		
		response.setContentType("text/html;charset=utf-8");
		
		/**
		 * 方法参数要什么就给什么. 对象
		 * 
		 * 创建对象的几种手法
		 * 
		 * 1.直接new
		 * 
		 * 2.单例模式  | 提供静态方法
		 * 
		 * 3.工厂模式构建  stu
		 * StuFactory StuBuilder
		 */
		
		//发送cookie给客户端
		//new Cookie(name, value);
		Cookie cookie = new Cookie("aa", "bb");
		//给响应,添加一个cookie
		response.addCookie(cookie);
		response.getWriter().write("请求......成功了么");
		
		//获取客户端带过来的cookie
		Cookie[] cookies = request.getCookies();
		if(cookies != null){
			for (Cookie cookie2 : cookies) {
				String cookieName = cookie2.getName();
				String cookieValue = cookie2.getValue();
				System.out.println(cookieName+"=cookieName---"+cookieValue+"=cookieValue");
			}
		}
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	
		doGet(request, response);
	}

}

web.xml:
 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>CookieDemo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>Demo01</display-name>
    <servlet-name>Demo01</servlet-name>
    <servlet-class>com.test.cookie.Demo01</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Demo01</servlet-name>
    <url-pattern>/Demo01</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>Demo02</display-name>
    <servlet-name>Demo02</servlet-name>
    <servlet-class>com.test.cookie.Demo02</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Demo02</servlet-name>
    <url-pattern>/Demo02</url-pattern>
  </servlet-mapping>
</web-app>

访问:

http://localhost:8081/CookieDemo/Demo02