Hello World Program in Servlet

Create ./helloworld directory for "Hello World" program in ../Apache Software Foundation/Tomcat 7.0/webapps and create following directory and file structure.

helloworld
├── WEB-INF
     ├── classes
     ├    └── HelloWorld.java
     └── web.xml

Write java code in HelloWorld.java file

// Import java libraries
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

// Define Class and Extend HttpServlet class
public class HelloWorld extends HttpServlet {

  public void init() throws ServletException
  {
  }

  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
            throws ServletException, IOException
  {
      // Set response content type
      response.setContentType("text/html");
      PrintWriter out = response.getWriter();
    // Print Hello World
      out.println("<h1>Hello World</h1>");
  }
}

Write Config code in web.xml file

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

 OutPut 

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