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A Holistic counter in Servlet

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In this program we are going to make a such a servlet which will count the number it has been accessed and the number of threads created by the server.

A Holistic counter in Servlet

     

In this program we are going to make a such a servlet which will count the number it has been accessed and the number of threads created by the server.

In this example firstly we are going to create one class named as HolisticCounterInServlet. Now declare a variable counter of int with initial value 0, the value of this counter will be different for each servlet and create a Hashtable object. This object will be shared by all the threads in the container. Inside the doGet() method use the method getWriter() method of the response object which will return the PrintWriter object. 

The code of the program is given below:

import java.io.*;
import java.io.IOException;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HolisticCounter extends HttpServlet{
int counter = 0//separate For Each Servlet
static Hashtable hashTable = new Hashtable()//Shared by all the threads 

public void doGet(HttpServletRequest request, HttpServletResponse response)
     
throws ServletException, IOException {
  response.setContentType("text/html");
  PrintWriter pw = response.getWriter();
  counter++;
  pw.println("This servlet has been accessed" + counter + "times<br>");
  hashTable.put(this,this);
  pw.println("There are currently" + hashTable.size() "threads<br>");
  }
}

The output of the program is given below:

Download this example:

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Posted on: March 12, 2008

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Comments:3
amar
December 7, 2011
A Holistic counter in Servlet

How to increase host counter that is increase number of threads
Arun
April 27, 2012
threads formed for servlets

if the servlet is called from different browsers, will it form different threads? Is that how hastable count and counter vary each other?
Shakti
October 1, 2012
A Holistic counter in Servlet

First of all, it does not count the number of threads created by container, it merely count the number of servlet instances that has been created and accessed!
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