1 Cookie的创建和发送

//1、创建cookie对象 Cookie cookie = new Cookie("name","zhangsan");//2、将cookie中存储的信息发送到客户端---头 response.addCookie(cookie);

2 Cookie的持久化

//1.1 为cookie设置持久化时间 ---- cookie信息在硬盘上保存的时间 cookie.setMaxAge(10*60);//10分钟 ---- 时间设置为0代表删除该cookie

3 什么时候携带Cookie？

//1.2 为cookie设置携带的路径 //cookie.setPath("/WEB16/sendCookie");//访问sendCookie资源时才携带这个cookie cookie.setPath("/WEB16");//访问WEB16下的任何资源时都携带这个cookie //cookie.setPath("/");//访问服务器下的所有的资源都携带这个cookie

4 Cookie的删除

使用同名同路径的cookie，设置时间为0，进行覆盖即可。

//删除客户端保存 name=zhangsan的cookie信息 Cookie cookie = new Cookie("name",""); //将path设置成与要删除cookie的path一致 cookie.setPath("/WEB16"); //设置时间是0 cookie.setMaxAge(0); response.addCookie(cookie);

5  服务端如何获取客户端携带的 Cookie

package 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 {//获得客户端携带的cookie的数据Cookie[] cookies = request.getCookies();//Cookie cookie = new Cookie("name","zhangsan");//通过cookie名称获得想要的cookieif(cookies!=null){for(Cookie cookie : cookies){//获得cookie的名称String cookieName = cookie.getName();if(cookieName.equals("name")){//name设置时候的名字 name //获得该cookie的值String cookieValue = cookie.getValue();System.out.println(cookieValue);}}}}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);} }

6 案例-显示用户的上次访问时间

1 案例分析

2 代码实现

package lastaccesstime;import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date;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 LastAccessTimeServlet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//获得当前时间Date date = new Date();SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");String currentTime = format.format(date);//1、创建Cookie 记录当前的最新的访问时间Cookie cookie = new Cookie("lastAccessTime",currentTime);cookie.setMaxAge(60*10*500);response.addCookie(cookie);//2、获得客户端携带cookie ---- lastAccessTimeString lastAccessTime = null;Cookie[] cookies = request.getCookies();if(cookies!=null){for(Cookie coo : cookies){if("lastAccessTime".equals(coo.getName())){lastAccessTime = coo.getValue();}}}response.setContentType("text/html;charset=UTF-8");if(lastAccessTime==null){response.getWriter().write("您是第一次访问");}else{response.getWriter().write("您上次的访问的时间是："+lastAccessTime);}}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);} }

7 Cookie_XMind总结

转载于:https://www.cnblogs.com/jepson6669/p/8330486.html

总结

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