package com.shanrengo;import java.io.IOException;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 用戶訪問countServlet，訪問次數+1 * 1.在countServlet初始化的時候，向ServletContext中保存一個訪問次數0 * @author Administrator * */public class CountServlet extends HttpServlet {	@Override	public void init() throws ServletException {		// TODO Auto-generated method stub		//向ServletContext保存訪問次數0		//ServletContext 中setAttribute方法		//1.獲得servletContext對象		ServletContext context = getServletContext();		//2.保存數據		context.setAttribute("visitTimes", 0);			}		public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		//每次訪問都會執行doGet		//1.從servletContext中獲得visitTimes		ServletContext context = getServletContext();		int times = (Integer) context.getAttribute("visitTimes");		//2.將visitTimes++		times++;		//3.更新		context.setAttribute("visitTimes", times);		System.out.println("網站被訪問了一次！");	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doGet(request, response);	}}

package com.shanrengo;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CountShowServlet extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		ServletContext context = getServletContext();		int times = (Integer) context.getAttribute("visitTimes");				response.getWriter().println(times);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doGet(request, response);	}}