//保存用户上一次访问的时间public class CookieDeom01 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //服务器，告诉你，你来的时间，把这个时间封装成一个信件，你下次来，我就你知道你来了 //解决中文乱码 req.setCharacterEncoding("gbk"); resp.setCharacterEncoding("gbk"); PrintWriter out = resp.getWriter(); //cookie,服务器从客户端获取 Cookie[] cookies = req.getCookies();//这里返回数组，说明cookie可能存在多个 //判断cookie是否存在 if(cookies!=null){ out.write("上一次你访问的时间是："); //两种for循环遍历// for (Cookie cookie:cookies) {//// } for (int i = 0; i <cookies.length; i++) { Cookie cookie = cookies[i]; //获取cookie的名字 if(cookie.getName().equals("lastLoginTime")){// cookie.getValue();//获取cookie的值 long lastLoginTime = Long.parseLong(cookie.getValue());//将字符串变成时间戳 Date date = new Date(lastLoginTime); out.write(date.toLocaleString()); } } }else { out.write("这是您第一次访问本站"); } //服务器给客户端响应一个cookie Cookie cookie = new Cookie("lastLoginTime",System.currentTimeMillis()+""); cookie.setMaxAge(24*60*60);//设置cookie有效期 秒为单位 resp.addCookie(cookie); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}
//删除cookiepublic class CookieDeom02 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Cookie cookie = new Cookie("lastLoginTime",System.currentTimeMillis()+""); cookie.setMaxAge(0); resp.addCookie(cookie); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}//解决cookie乱码
public class CookieDeom03 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("gbk"); resp.setCharacterEncoding("gbk"); PrintWriter out = resp.getWriter(); Cookie[] cookies = req.getCookies(); if(cookies!=null){ out.write("上一次你访问的时间是："); for (int i = 0; i <cookies.length; i++) { Cookie cookie = cookies[i]; if(cookie.getName().equals("name")){ out.write(URLDecoder.decode(cookie.getValue(),"utf-8"));//解决cookie中文乱码 } } }else { out.write("这是您第一次访问本站"); } Cookie cookie = new Cookie("name", URLEncoder.encode("胡浩","utf-8"));//解决cookie中文乱码 resp.addCookie(cookie); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}
