Cookie的实现例子

1.新建一个web项目  

这是项目的一个目录

2.代码的实现

package cookie;import java.io.IOException;import java.io.PRintWriter;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("/CookieExampleServlet")public class CookieExampleServlet extends HttpServlet {	private static final long serialVersionUID = 1L;	public CookieExampleServlet() {		super();	}	@Override	protected void doGet(HttpServletRequest req, HttpServletResponse resp)			throws ServletException, IOException {		resp.setContentType("text/html;charset=UTF-8");		PrintWriter out = resp.getWriter();		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		String nowtime = sdf.format(new Date());		String LastVisitTime = "";		int Count = 0;		// 从客户端获得所有的cookies		Cookie[] cookies = req.getCookies();		if (cookies != null) {			for (Cookie cookie : cookies) {				if ("LastVisitTime".equals(cookie.getName())) {					LastVisitTime = cookie.getValue();				}				if ("Count".equals(cookie.getName())) {					Count = Integer.valueOf(cookie.getValue());				}			}		}		// 如果曾经访问过，则输出访问的时间 和访问的次数		if (!"".equals(LastVisitTime))			out.print("您上一次访问的时间是：" + LastVisitTime);		out.print("您是第" + (Count + 1) + "次访问本网站");		Cookie pLastVisitTime = new Cookie("LastVisitTime", nowtime);		Cookie pCount = new Cookie("Count", "" + (Count + 1));		// 设置最大存活时间为一年		pLastVisitTime.setMaxAge(365 * 24 * 60 * 60);		pCount.setMaxAge(365 * 24 * 60 * 60);		// 新建cookie响应到客户端		resp.addCookie(pCount);		resp.addCookie(pLastVisitTime);	}}3.在网页中输入url
http://localhost:8080/CookieExample/CookieExampleServlet