Demo03 :
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 Demo03 * 设置cookie有效期及cookie常用方法 */public class Demo03 extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.发送客户端 可以给客户端返回多个cookieCookie cookie = new Cookie("name", "lisi");response.addCookie(cookie);Cookie cookie1 = new Cookie("sex", "men");response.addCookie(cookie1);//2.获取带客户端的数据Cookie[] cookies = request.getCookies();if(cookies != null){for (Cookie cookie2 : cookies) {System.out.println(cookie2.getName()+"="+cookie2.getValue());}}//3.cookie的有效期.默认情况下 7天//关闭浏览器后,cookie不存在.----->没有设置cookie的有效期/**expiry(有效) 以秒为单位* getMaxAge():返回以秒为单位的cookie的最大生存时间,默认情况下,-1表示该cookie将保留到浏览器关闭位置.* setMaxAge():以秒为单位* 正值表示cookie将在经过该值表示的秒数后过期.注意:该值是cookie过期的最大生存时间,不是cookie的当前生存时间.* 负值表示cookie不会被持久存储,将在web浏览器退出时删除.0会导致删除cookie[关闭浏览器,cookie就失效.默认值-1]*///有效期设为7天cookie.setMaxAge(60 * 60 * 24 * 7);/** * 扩展(常用的几个方法): * 赋值新的值 cookie.setValue(newValue); * 用于指定只有请求了指定的域名,才回带上该cookie.setDomain(domain); * 只有访问该域名下的 uri 这个路径才会带cookie cookie.setPath(uri); */}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> <servlet> <description></description> <display-name>Demo03</display-name> <servlet-name>Demo03</servlet-name> <servlet-class>com.test.cookie.Demo03</servlet-class> </servlet> <servlet-mapping> <servlet-name>Demo03</servlet-name> <url-pattern>/Demo03</url-pattern> </servlet-mapping></web-app>
访问:
http://localhost:8081/CookieDemo/Demo03