Service method of the Example
public void service (ServletRequest req, ServletResponse res)
throws ServletException, IOException
{ res.setContentType ( text/html );
PrintWriter out = res.getWriter ( );
out.println ( <title> A Sample Servlet </title>);
out.println ( </head>);
out.println ( <h1> A Sample Servlet </h1>);
out.println ( </body>);
out.println ( </html>);