samples/CompiledEJB/TransformServlet.java

/*
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 * The Apache Software License, Version 1.1
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 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 * 
 * @author Morten Jorgensen
 *
 */

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;

public class TransformServlet extends HttpServlet {

    // Error message used when the XSL transformation bean cannot be created
    private final static String createErrorMsg =
	"<h1>XSL transformation bean error</h1>"+
	"<p>An XSL transformation bean could not be created.</p>";

    // Transformer - "more than meets the eye".
    private TransformHome transformer;

    /**
     * Servlet initializer - look up the bean's home interface
     */
    public void init(ServletConfig config) 
	throws ServletException{
	try{
	    InitialContext context = new InitialContext();
	    Object transformRef = context.lookup("transform");
	    transformer =
		(TransformHome)PortableRemoteObject.narrow(transformRef,
							   TransformHome.class);
	} catch (Exception NamingException) {
	    NamingException.printStackTrace();
	}
    }

    /**
     * Handles "GET" HTTP requests - ie. runs the actual transformation
     */
    public void doGet (HttpServletRequest request, 
		       HttpServletResponse response) 
	throws ServletException, IOException {

	String document = request.getParameter("document");
	String translet = request.getParameter("translet");

	response.setContentType("text/html");

	PrintWriter out = response.getWriter();
	try{
	    // Get the insult from the bean
	    TransformRemote xslt = transformer.create();
	    String result = xslt.transform(document, translet);
	    out.println(result);
	} catch(Exception CreateException){
	    out.println(createErrorMsg);
	}
	out.close();
    }

    public void destroy() {
	System.out.println("Destroy");
    }
}