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Cookie Learning / * * Servlet in the server determines whether there is a cookie 1 named lastTime. Yes: it's not the first time to visit. Response data: welcome back. Your last visit was at 11:50:20 on June 10, 2018. Write back to Cookie:lastTime= 11:50:01 on June 10, 2018. No: this is my first visit. Response data: Hello, welcome to visit 2. Writing back to Cookie:lastTime= at 11:50:01 on June 10, 2018 to learn about URLEncoder encoding and URLDecoder decoding, you need to use a variable to receive * / @ WebServlet ("/ cookieDemo") public class CookieDemo extends HttpServlet {protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / set the data format of the response message body and encode response.setContentType ("text/html;charset=utf-8"); boolean flag=false Cookie [] cookies = request.getCookies (); if (cookes.length > 0) {for (Cookie cookie: cookies) {String name = cookie.getName (); if ("lastTime" .equals (name)) {/ / visit Date date = new Date () again SimpleDateFormat sdf = new SimpleDateFormat ("yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy Value = URLDecoder.decode (value, "utf-8"); response.getWriter (). Write ("come again, the last time you logged in was:" + value+ "); cookie.setValue (str_date); cookie.setMaxAge (60,60,24,30) Response.addCookie (cookie); break;} if (cookies==null | | cookies.length==0 | | flag==false) {/ / first time Date date = new Date (); SimpleDateFormat sdf = new SimpleDateFormat ("yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy System.out.println ("before coding:" + str_date); str_date = URLEncoder.encode (str_date, "utf-8"); System.out.println ("after coding:" + str_date "); Cookie cookie = new Cookie (" lastTime ", str_date); cookie.setMaxAge (60,60,24,30); response.addCookie (cookie) Str_date = URLDecoder.decode (str_date, "utf-8"); response.getWriter (). Write ("Hello, welcome to log in for the first time:" + str_date+ ");}} protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost (request, response) }} the above is about the content of the article "Analysis of the Application of cookie examples". I believe everyone has a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please follow the industry information channel.

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