javaEE Cookie

SendCookieServlet（设置Cookie）：

package com.xxx.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;

public class SendCookieServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		
		//创建cookie对象
		Cookie cookie = new Cookie("name","zhangsan"); // 只能存字符串,且不能是中文
		
		//设置过期时间(持久化); 不设置过期时间,默认是会话级别的,关闭浏览器就失效
		cookie.setMaxAge(10*60); //单位秒(10分钟);设置为0表示删除
		
		//设置cookie的有效路径; 默认有效路径是产生该cookie的web资源所在的路径
		//cookie.setPath("/MyWeb/xxx");  //访问xxx资源时才携带该cookie
		cookie.setPath("/MyWeb");  //访问MyWeb下的任何资源时都携带这个cookie
		
		//通过响应头通知客户端保存cookie
		response.addCookie(cookie);
				
	}

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

GetCookieServlet.java（获取Cookie）：

package com.xxx.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;

public class GetCookieServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		//获取客户端所有cookie对象
		Cookie[] cookies = request.getCookies();

		//通过cookie名称获得想要的cookie
		if(cookies!=null){
			for(Cookie cookie : cookies){
				//获得cookie的名称
				String cookieName = cookie.getName();  // 获取cookie对象中的名称
				if(cookieName.equals("name")){
					String cookieValue = cookie.getValue(); // 获取cookie对象中名称对应的值
					System.out.println(cookieValue);
				}
			}
		}
		
	}

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

RemoveCookieServlet.java（删除Cookie）：

package com.xxx.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;

public class RemoveCookieServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		
		//删除客户端保存 name=zhangsan的cookie信息
		Cookie cookie = new Cookie("name","");  // (同名同路径的cookie进行覆盖)
		//将path设置成与要删除cookie的path一致
		cookie.setPath("/MyWeb");
		//设置过期时间为0
		cookie.setMaxAge(0);
		
		response.addCookie(cookie);
		
	}

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

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