import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
?* Servlet implementation class countServlet1
?*/
@WebServlet("/countServlet1")
public class countServlet1 extends HttpServlet {
?? ?private static final long serialVersionUID = 1L;
? ? ? ?
? ? /**
? ? ?* @see HttpServlet#HttpServlet()
? ? ?*/
? ? public countServlet1() {
? ? ? ? super();
? ? ? ? // TODO Auto-generated constructor stub
? ? }

?? ?/**
?? ? * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
?? ? */
?? ?protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
?? ??? ?//設置字符編碼
?? ??? ?request.setCharacterEncoding("utf-8");
?? ??? ?response.setCharacterEncoding("utf-8");
?? ??? ?response.setContentType("text/html; charset=utf-8");
?? ??? ?
?? ??? ?//獲取全局的共享數據
?? ??? ?ServletContext servletContext = this.getServletContext();
?? ??? ?
?? ??? ?//獲取計數器count
?? ??? ?Integer count = (Integer) servletContext.getAttribute("count");
?? ??? ?
?? ??? ?//如果獲取的計算器對象為空 ，說明是第一次訪問，并將count，放入servletCount
?? ??? ?if( servletContext.getAttribute("count") == null) {
?? ??? ??? ?count = 1;
?? ??? ??? ?servletContext.setAttribute("count", count);
?? ??? ?}else {
?? ??? ??? ?//否則就不是第一次訪問，將登陸的計數器進行加1的數據更新
?? ??? ??? ?servletContext.setAttribute("count", count+1);
?? ??? ?}
?? ??? ?
?? ??? ?//將登陸的次數顯示在頁面上
?? ??? ?PrintWriter out =response.getWriter();
?? ??? ?out.print("<!DOCTYPE html>\r\n" +?
?? ??? ??? ??? ? ?"<html>\r\n" +?
?? ??? ??? ??? ? ?"<head>\r\n" +?
?? ??? ??? ??? ? ?"<meta charset=\"UTF-8\">\r\n" +?
?? ??? ??? ??? ? ?"<title>登陸網頁次數統(tǒng)計</title>\r\n" +?
?? ??? ??? ??? ? ?"</head>\r\n" +?
?? ??? ??? ??? ? ?"<body>");
?? ??? ?out.print("<h1>");
?? ??? ?out.print("您是第 "+ servletContext.getAttribute("count")+"位訪客");
?? ??? ?out.print("<h1>");
?? ??? ?out.print("</body>\r\n" +?
?? ??? ??? ??? ? ?"</html>

}

?? ?/**
?? ? * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
?? ? */
?? ?protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?doGet(request, response);
?? ?}

}