package web;
import java.io.IOException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/cookieText")
public class cookieText extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
Cookie[] cookies=request.getCookies(); //获取cookie对象
boolean flag=false;
if(cookies!=null&&cookies.length>0)
{
for (Cookie cookie : cookies) {
String name=cookie.getName();
if(name.equals("lastTime")) //访问过
{
flag=true;
Date date =new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
String sdate=sdf.format(date);
sdate=URLEncoder.encode(sdate,"utf-8"); //将时间转化为url编码
cookie.setValue(sdate);
cookie.setMaxAge(60*60*24*7); //设置存活时间为一星期
response.addCookie(cookie); //发送cookie对象
String value = cookie.getValue();
value=URLDecoder.decode(value,"utf-8");
response.getWriter().write("欢迎回来,您上次的访问时间为:"+value);
break;
}
}
}
if(cookies==null||cookies.length==0||flag==false)
{
Date date=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
String sdate=sdf.format(date);
sdate=URLEncoder.encode(sdate,"utf-8");
Cookie cookie=new Cookie("lastTime", sdate);
cookie.setMaxAge(60 * 60 * 24 * 7);
response.addCookie(cookie);
response.getWriter().write("您好,欢迎您首次访问");
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}