Home Quickguide Tomcat Creating Web application on tomcat server

Creating Web application on tomcat server
Posted on: July 8, 2008 at 12:00 AM

In this section we will show you how to create first web application using Servlet on the tomcat server. We first make a class named as HelloWorld that extends the abstract HttpServlet class.

Create your first Tomcat Web application

In this section we will show you how to create first web application using Servlet on the tomcat server.

We first make a class named as HelloWorld that extends the abstract HttpServlet class. The code written inside the doGet() method takes two arguments, first one is the reference of HttpServletRequest interface and the second one is the HttpServletResponse interface. This method can throw ServletException. This method calls the getWriter() method of the PrintWriter class.

Set the classpath of the relevant jar files to compile the servlet i.e.Setting the classpath of the servlet-api.jar file in the variable CLASSPATH inside the environment variable by using the following steps.

Now create a java source file as described further in this tutorial and a web.xml file in a directory structure.

Compile the java source file, put the compiled file (.class file) in the classes folder of your application and deploy the directory of your application in the webapps folder inside the tomcat directory.

The code the program is given below:

Package myservlets;

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

public class HelloWorld extends HttpServlet {

public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<head>");
out.println("<title>Hello World!</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Hello World!</h1>");
out.println("</body>");
out.println("</html>");
out.close();
}
}

XML File for this program:

<?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">

<description>Examples</description>
<display-name>Examples</display-name>

<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>myservlets.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern> /hello</url-pattern>
</servlet-mapping>
</web-app>

The output of the program is given below:

Download Source Code

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