JSP中实现网页访问统计的方法

来源:岁月联盟 编辑:exp 时间:2012-09-21

JSP中实现网页访问统计的方法

最近学习Jave EE 中的jsp网页开发,需要实现网页访问量的统计,刚开始不知道如何实现,后来问了一下老师,老师是这样回答我的:要实现网页访问的统计,你可以利用application对象来实现,不能用seesion对象,因为session是属于同一个会话的,关掉浏览器数据就没有了,而application是在同一浏览器下的,只要是同一个浏览器,将数据保存在applicaiton对象中,这样就可以保证数据的不变性。其实这些我都懂,我只是不知道如何在jsp用代码实现。后来我只能上网看看有没有具体的解决方案,搜了很久,没有我想要的答案,我想要实现的只是简单的统计,没有实现更加复杂的功能。后来还是在CSDN这里找到了答案,在这里简单总结一下实现网页访问统计的几种方法:www.2cto.com

1. 利用application对象进行统计,得到的效果是每进入一次该网页就统计一次。但效果不怎么好,因为一般统计网页访问量,刷新是不算进统计里的,这里就是这种缺点。

具体实现是:

[html] 
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%> 
<html> 
  <head> 
    <title>java 计数器程序</title> 
  </head> 
  <body> 
  <% 
    if (application.getAttribute("count") == null) { 
        application.setAttribute("count", new Integer(0)); 
    } 
    Integer count = (Integer) application.getAttribute("count"); 
    application 
            .setAttribute("count", new Integer(count.intValue() + 1)); 
    count = (Integer) application.getAttribute("count"); 
  %> 
     <center>这是第<%=count.intValue()%>个访问者</center> 
  </body> 
  </html> 

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html>
  <head>
    <title>java 计数器程序</title>
  </head>
  <body>
  <%
   if (application.getAttribute("count") == null) {
    application.setAttribute("count", new Integer(0));
   }
   Integer count = (Integer) application.getAttribute("count");
   application
     .setAttribute("count", new Integer(count.intValue() + 1));
   count = (Integer) application.getAttribute("count");
  %>
    <center>这是第<%=count.intValue()%>个访问者</center>
  </body>
  </html>
 

2.为了解决上面的问题,有了另一种方法,就是同时利用application对象和session对象来统计,这种方法的原理是从打开浏览器到关闭浏览器算是访问一次,刷新、返回等操作不算做一次访问。但还是有缺陷,当jsp服务器从新启动时,数据也被清零了。

下面还是具体实现:

[html] 
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%> 
<html> 
  <head> 
    <title>java 计数器程序</title> 
  </head> 
  <body> 
  <% 
    int n = 0; String counter = (String)application.getAttribute("counter"); 
    if(counter != null){ 
        n = Integer.parseInt(counter); 
    } 
    if(session.isNew()) 
        ++n; 
  %> 
     <center>这是第<%out.print(n);%>个访问者</center> 
     <% 
     counter = String.valueOf(n); 
     application.setAttribute("counter", counter); 
         %> 
  </body> 
  </html> 

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html>
  <head>
    <title>java 计数器程序</title>
  </head>
  <body>
  <%
   int n = 0; String counter = (String)application.getAttribute("counter");
   if(counter != null){
    n = Integer.parseInt(counter);
   }
   if(session.isNew())
    ++n;
  %>
    <center>这是第<%out.print(n);%>个访问者</center>
    <%
    counter = String.valueOf(n);
    application.setAttribute("counter", counter);
      %>
  </body>
  </html>
3. 第三种方法是将统计数据存储在本地的文件当中,比如存储在一个txt文件当中。

这是为了解决重启服务器之后数据不用担心会丢失。

创建一个类:JSPCount

 

[java] 
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; 
 
 
public class JSPCount { 
    //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) { 
                // TODO Auto-generated catch block  
                e.printStackTrace(); 
            } 
            write2File(filename, 0); 
        } 
        try{ 
            BufferedReader in = new BufferedReader(new FileReader(file)); 
            try{ 
                count = Long.parseLong(in.readLine()); 
            } 
            catch (NumberFormatException e) { 
                // TODO: handle exception  
                e.printStackTrace(); 
            } catch (IOException e) { 
                // TODO Auto-generated catch block  
                e.printStackTrace(); 
            } 
        } catch (FileNotFoundException e) { 
            // TODO: handle exception  
            e.printStackTrace(); 
        } 
        return count; 
    } 

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;


public class JSPCount {
 //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) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   write2File(filename, 0);
  }
  try{
   BufferedReader in = new BufferedReader(new FileReader(file));
   try{
    count = Long.parseLong(in.readLine());
   }
   catch (NumberFormatException e) {
    // TODO: handle exception
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   // TODO: handle exception
   e.printStackTrace();
  }
  return count;
 }
}

 

 

 在WebRoot目录下建jsp文件:count.jsp

[plain] 
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%> 
<%@ page import="org.wwj.count.JSPCount" %> 
<html> 
  <head> 
    <title>java 计数器程序</title> 
  </head> 
  <body> 
  <% 
    JSPCount CountFileHandler = new JSPCount(); 
    //读取文件 
    long count = CountFileHandler.readFromFile(request.getRealPath("/")  + "count.txt"); 
    count = count + 1;  //修改记录 +1 
    out.print(count);   //显示数据 
    //更新文件内容。 
    CountFileHandler.write2File(request.getRealPath("/")  + "count.txt", count); 
     
   %> 
  </body> 
  </html> 

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%@ page import="org.wwj.count.JSPCount" %>
<html>
  <head>
    <title>java 计数器程序</title>
  </head>
  <body>
  <%
   JSPCount CountFileHandler = new JSPCount();
   //读取文件
   long count = CountFileHandler.readFromFile(request.getRealPath("/")  + "count.txt");
   count = count + 1; //修改记录 +1
   out.print(count); //显示数据
   //更新文件内容。
   CountFileHandler.write2File(request.getRealPath("/")  + "count.txt", count);
   
   %>
  </body>
  </html>
程序运行之后会在tomcat下的webapps目录下的对应的web项目生成一个count.txt文本文件

 

 

4.第三种方法,只是保存了访问的统计数据罢了,但没有保证刷新页面的时候不会自增,这样还是不好。当然总会有解决的办法的,一般的解决方案就是结合各种方案的优点。下面是由session对象+application对象+txt文本来实现网站的访问统计。

[java] 
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) { 
                // TODO Auto-generated catch block  
                e.printStackTrace(); 
            } 
            write2File(filename, 0); 
        } 
        try{ 
            BufferedReader in = new BufferedReader(new FileReader(file)); 
            try{ 
                count = Long.parseLong(in.readLine()); 
            } 
            catch (NumberFormatException e) { 
                // TODO: handle exception  
                e.printStackTrace(); 
            } catch (IOException e) { 
                // TODO Auto-generated catch block  
                e.printStackTrace(); 
            } 
        } catch (FileNotFoundException e) { 
            // TODO: handle exception  
            e.printStackTrace(); 
        } 
        return count; 
    } 

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) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   write2File(filename, 0);
  }
  try{
   BufferedReader in = new BufferedReader(new FileReader(file));
   try{
    count = Long.parseLong(in.readLine());
   }
   catch (NumberFormatException e) {
    // TODO: handle exception
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   // TODO: handle exception
   e.printStackTrace();
  }
  return count;
 }
}
 

 

jsp文件代码:

[plain] 
<%@page import="org.servlet.count.Counter"%> 
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%> 
<html> 
    <head> 
        <title>java 计数器程序</title> 
    </head> 
    <body> 
    <% 
    Counter CountFileHandler = new Counter(); 
    long count = 0; 
    if(application.getAttribute("count") == null){ 
        count = CountFileHandler.readFromFile(request.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(request.getRealPath("/") + "count.txt",count); 
        } 
    %> 
    访问人数:<%=count %> 
        </body> 
</html> 

<%@page import="org.servlet.count.Counter"%>
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html>
 <head>
  <title>java 计数器程序</title>
 </head>
 <body>
 <%
   Counter CountFileHandler = new Counter();
   long count = 0;
 if(application.getAttribute("count") == null){
  count = CountFileHandler.readFromFile(request.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(request.getRealPath("/") + "count.txt",count);
  }
 %>
 访问人数:<%=count %>
  </body>
</html>