1.新建一個web項目  

這是項目的一個目錄

2.代碼的實現

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;		// 從客戶端獲得所有的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());				}			}		}		// 如果曾經訪問過，則輸出訪問的時間 和訪問的次數		if (!"".equals(LastVisitTime))			out.print("您上一次訪問的時間是：" + LastVisitTime);		out.print("您是第" + (Count + 1) + "次訪問本網站");		Cookie pLastVisitTime = new Cookie("LastVisitTime", nowtime);		Cookie pCount = new Cookie("Count", "" + (Count + 1));		// 設置最大存活時間為一年		pLastVisitTime.setMaxAge(365 * 24 * 60 * 60);		pCount.setMaxAge(365 * 24 * 60 * 60);		// 新建cookie響應到客戶端		resp.addCookie(pCount);		resp.addCookie(pLastVisitTime);	}}3.在網頁中輸入url
http://localhost:8080/CookieExample/CookieExampleServlet