项目中用到的一个简单的流量统计例子-java流量统计

两个步骤搞定

1：工具类

import java.io.BufferedReader;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.http.HttpServlet;

public class Counter extends HttpServlet {

// 写入文件的方法

public static void write2File(String filename, long count) {

try {

PrintWriter out = new PrintWriter(new FileWriter(filename));

out.println(count);

out.close();

} catch (IOException e) {

// TODO: handle exception

e.printStackTrace();

}

}

// 读文件的方法

public static long readFromFile(String filename) {

File file = new File(filename);

long count = 0;

if (!file.exists()) {

try {

file.createNewFile();

} catch (IOException e) {

e.printStackTrace();

}

write2File(filename, 0);

}

try {

BufferedReader in = new BufferedReader(new FileReader(file));

try {

count = Long.parseLong(in.readLine());

} catch (NumberFormatException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

} catch (FileNotFoundException e) {

e.printStackTrace();

}

return count;

}

}

2：jsp页面

<%@page contentType="text/html;charset=UTF-8"%>

<%@page pageEncoding="UTF-8"%>

<%@page import="com.dsg.cccs.utils.Counter"%>

<%@page language="java" import="java.util.*"%>

<div class="foot">

<div class="foot_cont">

<!-- 网站访问量统计采用application+session+txt文件保存方式实现，防止刷新页面记录， -->

<%

Counter CountFileHandler = new Counter();

long count = 0;

if(application.getAttribute("count") == null){

count = CountFileHandler.readFromFile(session.getServletContext().getRealPath("count.txt"));

application.setAttribute("count", new Long(count));

}

count = (Long)application.getAttribute("count");

if(session.isNew()){

count++;

application.setAttribute("count", count);

//更新文件目录

CountFileHandler.write2File(session.getServletContext().getRealPath("count.txt"),count);

}

%>

访问量：<%=count %>

</div>

</div>