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JSP中实现网页访问统计的方法
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JSP中实现网页访问统计的方法
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JSP中實現網頁訪問統計的方法最近學習Jave EE 中的jsp網頁開發，需要實現網頁訪問量的統計，剛開始不知道如何實現，后來問了一下老師，老師是這樣回答我的：要實現網頁訪問的統計，你可以利用application對象來實現，不能用seesion對象，因為session是屬于同一個會話的，關掉瀏覽器數據就沒有了，而application是在同一瀏覽器下的，只要是同一個瀏覽器，將數據保存在applicaiton對象中，這樣就可以保證數據的不變性。其實這些我都懂，我只是不知道如何在jsp用代碼實現。后來我只能上網看看有沒有具體的解決方案，搜了很久，沒有我想要的答案，我想要實現的只是簡單的統計，沒有實現更加復雜的功能。后來還是在CSDN這里找到了答案，在這里簡單總結一下實現網頁訪問統計的幾種方法：www.2cto.com1. 利用application對象進行統計，得到的效果是每進入一次該網頁就統計一次。但效果不怎么好，因為一般統計網頁訪問量，刷新是不算進統計里的，這里就是這種缺點。具體實現是：[html]
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html> <head> <title>java 計數器程序</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>這是第<%=count.intValue()%>個訪問者</center> </body> </html> <%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html><head><title>java 計數器程序</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>這是第<%=count.intValue()%>個訪問者</center></body></html>2.為了解決上面的問題，有了另一種方法，就是同時利用application對象和session對象來統計，這種方法的原理是從打開瀏覽器到關閉瀏覽器算是訪問一次，刷新、返回等操作不算做一次訪問。但還是有缺陷，當jsp服務器從新啟動時，數據也被清零了。下面還是具體實現：[html]
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html> <head> <title>java 計數器程序</title> </head> <body> <% int n = 0; String counter = (String)application.getAttribute("counter"); if(counter != null){ n = Integer.parseInt(counter); } if(session.isNew()) ++n; %> <center>這是第<%out.print(n);%>個訪問者</center> <% counter = String.valueOf(n); application.setAttribute("counter", counter); %> </body> </html> <%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html><head><title>java 計數器程序</title></head><body><%int n = 0; String counter = (String)application.getAttribute("counter");if(counter != null){n = Integer.parseInt(counter);}if(session.isNew())++n;%><center>這是第<%out.print(n);%>個訪問者</center><%counter = String.valueOf(n);application.setAttribute("counter", counter);%></body></html>
3. 第三種方法是將統計數據存儲在本地的文件當中，比如存儲在一個txt文件當中。這是為了解決重啟服務器之后數據不用擔心會丟失。創建一個類：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 { //寫入文件的方法 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(); } } //讀文件的方法 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 {//寫入文件的方法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 exceptione.printStackTrace();}}//讀文件的方法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 blocke.printStackTrace();}write2File(filename, 0);}try{BufferedReader in = new BufferedReader(new FileReader(file));try{count = Long.parseLong(in.readLine());}catch (NumberFormatException e) {// TODO: handle exceptione.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO: handle exceptione.printStackTrace();}return count;}
}在WebRoot目錄下建jsp文件：count.jsp[plain]
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%@ page import="org.wwj.count.JSPCount" %>
<html> <head> <title>java 計數器程序</title> </head> <body> <% JSPCount CountFileHandler = new JSPCount(); //讀取文件 long count = CountFileHandler.readFromFile(request.getRealPath("/") + "count.txt"); count = count + 1; //修改記錄 +1 out.print(count); //顯示數據 //更新文件內容。 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 計數器程序</title></head><body><%JSPCount CountFileHandler = new JSPCount();//讀取文件long count = CountFileHandler.readFromFile(request.getRealPath("/") + "count.txt");count = count + 1; //修改記錄 +1out.print(count); //顯示數據//更新文件內容。CountFileHandler.write2File(request.getRealPath("/") + "count.txt", count);%></body></html>
程序運行之后會在tomcat下的webapps目錄下的對應的web項目生成一個count.txt文本文件4.第三種方法，只是保存了訪問的統計數據罷了，但沒有保證刷新頁面的時候不會自增，這樣還是不好。當然總會有解決的辦法的，一般的解決方案就是結合各種方案的優點。下面是由session對象+application對象+txt文本來實現網站的訪問統計。[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{ //寫入文件的方法 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(); } } //讀文件的方法 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{//寫入文件的方法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 exceptione.printStackTrace();}}//讀文件的方法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 blocke.printStackTrace();}write2File(filename, 0);}try{BufferedReader in = new BufferedReader(new FileReader(file));try{count = Long.parseLong(in.readLine());}catch (NumberFormatException e) {// TODO: handle exceptione.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO: handle exceptione.printStackTrace();}return count;}
}jsp文件代碼：[plain]
<%@page import="org.servlet.count.Counter"%>
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html> <head> <title>java 計數器程序</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); //更新文件目錄 CountFileHandler.write2File(request.getRealPath("/") + "count.txt",count); } %> 訪問人數：<%=count %> </body>
</html> <%@page import="org.servlet.count.Counter"%>
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<html><head><title>java 計數器程序</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);//更新文件目錄CountFileHandler.write2File(request.getRealPath("/") + "count.txt",count);}%>訪問人數：<%=count %></body>
</html>
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