cookie应用 显示客户上次的登陆时间和删除上次访问时间
package cn.cast.cookie; 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; //代表网站首页 public class CookieDemo1 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("utf-8");//第一句，设置服务器端编码 response.setContentType("text/html;charset=utf-8");//第二句，设置浏览器端解码 PrintWriter writer = response.getWriter(); writer.print("<a href='/web2/servlet/DeleteCookie'>清除上次访问时间</a><br>"); writer.print("您上次的访问时间是:"); //获得用户的时间cookie Cookie cookies[] = request.getCookies(); for (int i=0;cookies !=null&&i<cookies.length;i++){ if(cookies[i].getName().equals("lastacesstime")){ long cookietime = Long.parseLong(cookies[i].getValue());//得到用户的访问时间 Date date = new Date(cookietime); writer.print(date.toLocaleString()); } } //给用户返回 服务器创建cookie给客户端 Cookie cookie = new Cookie("lastacesstime", System.currentTimeMillis()+""); cookie.setMaxAge(1*30*24*3600); cookie.setPath("/web2"); response.addCookie(cookie); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } package cn.cast.cookie; import java.io.IOException; import java.io.PrintWriter; 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 DeleteCookie extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //需要设置同名cookie并且必要的参数要相同 cookie.setPath Cookie cookie = new Cookie("lastacesstime",System.currentTimeMillis()+""); cookie.setMaxAge(0); cookie.setPath("/web2"); response.addCookie(cookie); response.sendRedirect("/web2/servlet/CookieDemo1"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
