Servlet initialisation parameters

package com.ack.web.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * initialisation parameters inside the web.xml file

 <servlet>

 <servlet-name>initialisation</servlet-name>

 <servlet-class>com.ack.web.servlet.ServletInitialisationParameters</servlet-class>

 <init-param>

 <param-name>jdbcurl</param-name>

 <param-value>someurl</param-value>

 </init-param>

 <init-param>

 <param-name>password</param-name>

 <param-value>bah</param-value>

 </init-param>

 <init-param>

 <param-name>username</param-name>

 <param-value>foo</param-value>

 </init-param>

 </servlet>

 */

public class ServletInitialisationParameters extends HttpServlet {

  public void init() throws ServletException {

    String jdbcURL = getInitParameter( "jdbcurl" );

    String username = getInitParameter( "username" );

    String password = getInitParameter( "password" );

    try {

      if( jdbcURL == null || username == null || password == null ) {

        StringBuffer buf = new StringBuffer( "you must specify the " );

        buf.append( " 'jdbcurl', 'username', 'password' init params to -> " );

        buf.append( getClass().getName() + " within you web.xml file" );

        String msg = buf.toString();

        System.out.println( buf );

//        log( msg );

//        throw new ServletException( msg );

      }

      else {

        // possible get connection to database

      }

    }

    catch( Exception ex ) {

      log( ex.toString() );

      throw new ServletException( ex.toString() );

    }

    finally {

      // do any clean-up if you need to

    }

    log( "Completed Initialisation ->" + getClass().getName() );

  }

  public void doGet( HttpServletRequest req, HttpServletResponse res )

      throws ServletException, IOException {

    res.setContentType( "text/html" );

    PrintWriter pw = res.getWriter();

    pw.println( "<h3>Servlet Initialisation Parameters</h3>" );

    pw.println( "<p><hr noshade><p>" );

    Enumeration e = getInitParameterNames();

    while( e.hasMoreElements() ) {

      String paramName = (String) e.nextElement();

      pw.println( "Initialisation Parameter: [ " );

      pw.println( paramName + " = " + getInitParameter( paramName ) );

      pw.println( " ]<br>" );

    }

  }

}