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Naresh

Servlet example
1 Answer(s) 5 years and 2 months ago
Posted in : Servlet Interview Questions

Servlet Example

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April 10, 2008 at 7:46 PM

Hi friend

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";
version="2.4">

<servlet>
<servlet-name>MultiInstance</servlet-name>
<servlet-class>MultipleInstances</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MultiInstance</servlet-name>
<url-pattern>/MultipleInstances</url-pattern>
</servlet-mapping>

</web-app>

MultipleInstances.java

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

public class MultipleInstances extends HttpServlet {

static int classCount = 0; // shared by all instances
int count = 0;
static Hashtable instances = new Hashtable(); // also shared

public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/plain");
PrintWriter out = res.getWriter();

count++;
out.println("Since loading, this servlet instance has been accessed " + count + " times.");
instances.put(this, this);
out.println("There are currently " + instances.size() + " instances.");
classCount++;
out.println("Across all instances, this servlet class has been " + "accessed " + classCount + " times.");
}
}

---------------------------

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