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In JAVA assume you are designing a website, your boss asks you to design a program...

In JAVA

assume you are designing a website, your boss asks you to design a program name HitCounter that can count how many hits received in the past minute. you may assume that each hit come with a time stamp, hits are recieved in a chronological order. An example is monotonically increasing, earliest stamp starts at 1,and no hits arrive at the same time.

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Answer #1

Hi, As for web applications, you need to code your requirement in a servlet class.

Explanation of code:

Here, I have written a simple servlet which increments the count by 1 each time when the website user hit that website. I am displaying the hits in last minute. after the minute pass by again the count starts from 1.

I have initialized the counter and the current tiime in the init() method and the rest of the code follows in the doGet() method.

CODE:

PageHitCounter.java

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
import java.io.*;
import java.sql.Date;
import java.sql.Timestamp;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class PageHitCounter extends HttpServlet {

private int hitCount;
private int currentMinute;

public void init() {
//getting current minute
Calendar calendar = Calendar.getInstance();
currentMinute = calendar.get(Calendar.MINUTE);
  
// Reset hit counter.
hitCount = 0;
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

// Set response content type
response.setContentType("text/html");

// This method executes whenever the servlet is hit
// increment hitCount
hitCount++;
PrintWriter out = response.getWriter();
String title = "Total Number of Hits";
String docType = "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
Calendar calendar = Calendar.getInstance();

int newMinute = calendar.get(Calendar.MINUTE);
  
if (newMinute != currentMinute)
{
System.out.println("in if");
hitCount=1;
currentMinute=newMinute;
  
}
out.println(docType +
"<html>\n" +
"<head><title>" + title + "</title></head>\n" +
"<body bgcolor = \"#f0f0f0\">\n" +
"<h1 align = \"center\">" + title + "</h1>\n" +
"<h2 align = \"center\">" + hitCount + "</h2>\n" +
"</body>"+
"</html>"
);
}

public void destroy() {
// This is optional step but if you like you
// can write hitCount value in your database.
}
}

Web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<servlet>
<servlet-name>PageHitCounter</servlet-name>
<servlet-class>PageHitCounter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PageHitCounter</servlet-name>
<url-pattern>/PageHitCounter</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>

OUTPUT:

Total Number of Hits

Please do comment in case of queries. Thanks!!!!!

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