本文实例为大家分享了servlet Cookie的使用方法，供大家参考，具体内容如下
1.cookie介绍
Cookie，指某些网站为了辨别用户身份、进行 session 跟踪而储存在用户本地终端上的数据（通常经过加密）。（可以叫做浏览器缓存）
2.cookie案例
servlet 源码
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package com.learn;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;/** * */public class CookieServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //cookie引用 Cookie cookie = null; //设置返回类型为文本类型 resp.setContentType("text/plain"); //获取输出对象 PrintWriter out = resp.getWriter(); //从请求参数中获取cookies Cookie[] cookies = req.getCookies(); if(cookies != null){ for (int i = 0; i < cookies.length ; i++) { out.println("name:"+cookies[i].getName()); out.println("value:"+cookies[i].getValue()); //如果cookie值为user，则赋值给cookie if(cookies[i].getName().equals("user")){ cookie = cookies[i]; } } } else { out.print("no cookie"); } if(cookie == null){ cookie = new Cookie("user","tom"); //设置cookie最大值为60分钟 cookie.setMaxAge(60*60); resp.addCookie(cookie); } else if(cookie.getValue().equals("tom")){ cookie.setValue("jack"); resp.addCookie(cookie); } else if(cookie.getValue().equals("jack")){ cookie.setMaxAge(0); resp.addCookie(cookie); } out.close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); }} |
web,xml 配置
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<servlet> <servlet-name>cookie</servlet-name> <servlet-class>com.learn.CookieServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>cookie</servlet-name> <url-pattern>/cookie</url-pattern></servlet-mapping> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/wwyx-xi/p/7594355.html
