统计页面浏览次数：使用的是servlet实现统计次数传递给JSP页面
说明：我做的都比较接地气，意思就是比较简单！
效果图如下：
上代码
counter.java(它真的好简单，啥事不干，只是定义一个访问次数的基值)：
1 package util; 2 3 public class Counter { 4 public static int COUNT_ONLINE=1; 5 }
Count.java(servlet):它负责处理业务逻辑，获取访问次数并传递给JSP页面
特别注意：
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容器启动时便会初始化一个ServleContext 他是被所有servlet共享的., 14 //二ServletConfig是当前Servlet的"配置类:,但是ServletConfig中会维护这ServletContex 15 //这里它的作用相当于JSP页面的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:很简单，就只是EL表达式获取下servlet传过来的count变量值
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() %>,欢迎你！<%} %> 27 hello word! 28 29 30 页面被访问：${count } 31 </body> 32 </html>