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這篇文章主要介紹如何使用servlet實(shí)現(xiàn)統(tǒng)計(jì)網(wǎng)頁訪問次數(shù),文中介紹的非常詳細(xì),具有一定的參考價值,感興趣的小伙伴們一定要看完!
(1)ServletContext和ServletConfig的區(qū)別
ServletContext作為整個web應(yīng)用的共享數(shù)據(jù)
ServletConfig只是作為當(dāng)前servlet的數(shù)據(jù)共享,下一個servlet訪問時,是訪問不到的
將顯示的統(tǒng)計(jì)次數(shù)顯示在HTML頁面上:
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(shè)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(shù)據(jù) ServletContext servletContext = this.getServletContext(); //獲取計(jì)數(shù)器count Integer count = (Integer) servletContext.getAttribute("count"); //如果獲取的計(jì)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(jì)數(shù)器進(jìn)行加1的數(shù)據(jù)更新 servletContext.setAttribute("count", count+1); } //將登陸的次數(shù)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(wǎng)頁次數(shù)統(tǒng)計(jì)</title>\r\n" + "</head>\r\n" + "<body>"); out.print("<h2>"); out.print("您是第 "+ servletContext.getAttribute("count")+"位訪客"); out.print("<h2>"); 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); } }
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