JS+JSP method to implement static page visit count statistics through img tag call

JS+JSP method to implement static page visit count statistics through img tag call_javascript skills

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Release： 2016-05-16 15:25:45

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The example in this article describes the method of JS+JSP using the img tag to achieve statistics on the number of static page visits. Share it with everyone for your reference, the details are as follows:

Test page: test.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>test</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
 </head>
 <body>
 this is a test page.
<script type="text/javascript">document.write("<img src=http://127.0.0.1:8080/EasyCMS/pv.jsp border=0 width=0 height=0>");</script>
 </body>
</html>

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Statistical program: pv.jsp：

Assume the deployment location is http://127.0.0.1:8080/EasyCMS/pv.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<%
String path="/opt/test.txt";
writeNumber(String.valueOf(readNumber(path)+1),path);
%>
<%=readNumber(path) %>
<%!
  /**
   * 写入数字内容
   *
   * @param number
   * @param filename
   * @return
   */
  public boolean writeNumber(String number, String filename) {
    try {
      FileOutputStream fos = new FileOutputStream(filename);
      OutputStreamWriter writer = new OutputStreamWriter(fos);
      writer.write(number);
      writer.close();
      fos.close();
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }
  /**
   * 读取数字内容
   * 
   * @param filename
   * @return
   */
  public int readNumber(String filename) {
    int number = 0;
    try {
      File file = new File(filename);
      if (file.exists()) {
        FileReader fr = new FileReader(file);
        BufferedReader br = new BufferedReader(fr);
        String contents = br.readLine();
        if (contents != null && contents.length() > 0) {
          contents = contents.replaceAll("[^0-9]", "");
          number = Integer.valueOf(contents);
        }
        br.close();
        fr.close();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return number;
  }
%>

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Basic idea:

When accessing a static page, specify src as the address of access statistics through the img tag, and the img tag sends a request to the statistics program to implement statistics.
The statistical sample code uses files to record the number of visits, and actual projects can record the database.

Key code:

Copy code The code is as follows:

I hope this article will be helpful to everyone in JavaScript programming.