正文
JSP+Servlet+JavaBean统计页面在线访问次数
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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)：
package util; public class Counter {
public static int COUNT_ONLINE=1;
}
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");
package servlet;
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;
import util.Counter;
public class Count extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// 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.,
//二ServletConfig是当前Servlet的"配置类:,但是ServletConfig中会维护这ServletContex
//这里它的作用相当于JSP页面的application
ServletContext servletContext =this.getServletContext();
Object count = servletContext.getAttribute("count");
if(count ==null){
servletContext.setAttribute("count", Counter.COUNT_ONLINE);
}else{
servletContext.setAttribute("count", Counter.COUNT_ONLINE++);
}
req.getRequestDispatcher("/count.jsp").forward(req, resp);
} @Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(req, resp);
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
super.service(req, resp);
} }
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
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Object message = session.getAttribute("sucess"); if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=message%>");
</script>
<%} %> <%
Object username = session.getAttribute("username");
if(username!=null && !"".equals(username)){ %>
<%=username.toString() %>,欢迎你！<%} %>
hello word! 页面被访问：${count }
</body>
</html>
