servlet之cookied深入浅出

package com.mucfc; import java.io.IOException; import java.io.PrintWriter; 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; /** * cookied测试 * @author 林炳文Evankaka（博客：http://blog.csdn.net/evankaka） * @since 2015.6.24 */ public class CookiedServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置浏览器以UTF-8编码进行接收,解决中文乱码问题 response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); //获取浏览器访问访问服务器时传递过来的cookie数组 Cookie[] cookies = request.getCookies(); //如果用户是第一次访问，那么得到的cookies将是null if (cookies!=null) { out.write("您上次访问的时间是："); for (int i = 0; i < cookies.length; i++) { Cookie cookie = cookies[i]; if (cookie.getName().equals("lastAccessTime")) { Long lastAccessTime =Long.parseLong(cookie.getValue()); Date date = new Date(lastAccessTime); out.write(date.toLocaleString()); } } }else { out.write("这是您第一次访问本站！"); } //用户访问过之后重新设置用户的访问时间，存储到cookie中，然后发送到客户端浏览器 Cookie cookie = new Cookie("lastAccessTime", System.currentTimeMillis()+"");//创建一个cookie，cookie的名字是lastAccessTime //设置Cookie的有效期为1天 cookie.setMaxAge(24*60*60); //将cookie对象添加到response对象中，这样服务器在输出response对象中的内容时就会把cookie也输出到客户端浏览器 response.addCookie(cookie); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } }