統計頁面瀏覽次數：使用的是servlet實現統計次數傳遞給JSP頁面
說明：我做的都比較接地氣，意思就是比較簡單！
效果圖如下：
上代碼
counter.java(它真的好簡單，啥事不干，只是定義一個訪問次數的基值)：
1 package util; 2 3 public class Counter { 4 public static int COUNT_ONLINE=1; 5 }
Count.java(servlet):它負責處理業務邏輯，獲取訪問次數並傳遞給JSP頁面
特別注意：
ServletContext servletContext =this.getServletContext();
Object count = servletContext.getAttribute("count");
1 package servlet; 2 import java.io.IOException; 3 import javax.servlet.ServletContext; 4 import javax.servlet.ServletException; 5 import javax.servlet.http.HttpServlet; 6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpServletResponse; 8 import util.Counter; 9 public class Count extends HttpServlet{ 10 @Override 11 protected void doGet(HttpServletRequest req, HttpServletResponse resp) 12 throws ServletException, IOException { 13 // 一般servlet容器啟動時便會初始化一個ServleContext 他是被所有servlet共享的., 14 //二ServletConfig是當前Servlet的"配置類:,但是ServletConfig中會維護這ServletContex 15 //這里它的作用相當於JSP頁面的application 16 ServletContext servletContext =this.getServletContext(); 17 Object count = servletContext.getAttribute("count"); 18 if(count ==null){ 19 servletContext.setAttribute("count", Counter.COUNT_ONLINE); 20 }else{ 21 servletContext.setAttribute("count", Counter.COUNT_ONLINE++); 22 } 23 req.getRequestDispatcher("/count.jsp").forward(req, resp); 24 } 25 26 @Override 27 protected void doPost(HttpServletRequest req, HttpServletResponse resp) 28 throws ServletException, IOException { 29 // TODO Auto-generated method stub 30 doGet(req, resp); 31 } 32 @Override 33 protected void service(HttpServletRequest req, HttpServletResponse resp) 34 throws ServletException, IOException { 35 // TODO Auto-generated method stub 36 super.service(req, resp); 37 } 38 39 }
web.xml
<servlet> <servlet-name>count</servlet-name> <servlet-class>servlet.Count</servlet-class> </servlet> <servlet-mapping> <servlet-name>count</servlet-name> <url-pattern>/servlet/count</url-pattern> </servlet-mapping>
count.jsp:很簡單，就只是EL表達式獲取下servlet傳過來的count變量值
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <% 11 Object message = session.getAttribute("sucess"); 12 13 if(message!=null && !"".equals(message)){ 14 15 %> 16 <script type="text/javascript"> 17 alert("<%=message%>"); 18 </script> 19 <%} %> 20 21 <% 22 Object username = session.getAttribute("username"); 23 if(username!=null && !"".equals(username)){ 24 25 %> 26 <%=username.toString() %>,歡迎你！<%} %> 27 hello word! 28 29 30 頁面被訪問：${count } 31 </body> 32 </html>