import java.io.FileInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;import java.io.ByteArrayOutputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMResult;import javax.xml.transform.dom.DOMSource;import org.w3c.tidy.Tidy;import org.w3c.dom.Document;import org.xml.sax.InputSource;import org.apache.fop.apps.Driver;import org.apache.fop.messaging.MessageHandler;import org.apache.fop.tools.DocumentInputSource;import org.apache.avalon.framework.logger.ConsoleLogger;import org.apache.avalon.framework.logger.Logger;/* *  Class that converts HTML to PDF using *  the DOM interfaces of JTidy, Xalan, and FOP. * *  @author N. Afshartous *  */public class Html2Pdf {    public static void main(String[] args) {	// open file	if (args.length != 2) {	    System.out.println("Usage: Html2Pdf htmlFile styleSheet");	    System.exit(1);	}	FileInputStream input = null;	String htmlFileName = args[0];		try {				input = new FileInputStream(htmlFileName);		}	catch (java.io.FileNotFoundException e) {		System.out.println("File not found: " + htmlFileName);	}        Tidy tidy = new Tidy();	Document xmlDoc = tidy.parseDOM(input, null);		Document foDoc = xml2FO(xmlDoc, args[1]);	String pdfFileName = htmlFileName.substring(0, htmlFileName.indexOf(".")) + ".pdf";	try {	    OutputStream pdf = new FileOutputStream(new File(pdfFileName));	    pdf.write(fo2PDF(foDoc));	}	catch (java.io.FileNotFoundException e) {	    System.out.println("Error creating PDF: " + pdfFileName);	}	catch (java.io.IOException e) {	    System.out.println("Error writing PDF: " + pdfFileName);	}	    }    /*     *  Applies stylesheet to input.     *     *  @param xml  The xml input Document     *       *  @param stylesheet Name of the stylesheet     *     *  @return Document  Result of the transform     */    private static Document xml2FO(Document xml, String styleSheet) {	DOMSource xmlDomSource = new DOMSource(xml);      	DOMResult domResult = new DOMResult();	Transformer transformer = getTransformer(styleSheet);		if (transformer == null) {	    System.out.println("Error creating transformer for " + styleSheet);	    System.exit(1);	}	try {	    transformer.transform(xmlDomSource, domResult);	}	catch (javax.xml.transform.TransformerException e) {	    return null;	}	return (Document) domResult.getNode();    }    /*     *  Apply FOP to XSL-FO input     *     *  @param foDocument  The XSL-FO input     *       *  @return byte[]  PDF result     */    private static byte[] fo2PDF(Document foDocument) {        DocumentInputSource fopInputSource = new DocumentInputSource(                                                         foDocument);        try {            ByteArrayOutputStream out = new ByteArrayOutputStream();            Logger log = new ConsoleLogger(ConsoleLogger.LEVEL_WARN);            Driver driver = new Driver(fopInputSource, out);            driver.setLogger(log);            driver.setRenderer(Driver.RENDER_PDF);            driver.run();            return out.toByteArray();        } catch (Exception ex) {            return null;        }    }    /*     *  Create and return a Transformer for the specified stylesheet.     *       *  Based on the DOM2DOM.java example in the Xalan distribution.     */    private static Transformer getTransformer(String styleSheet) {	try {	    TransformerFactory tFactory = TransformerFactory.newInstance();	    DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();	    dFactory.setNamespaceAware(true);      	    DocumentBuilder dBuilder = dFactory.newDocumentBuilder();	    Document xslDoc = dBuilder.parse(styleSheet);	    DOMSource xslDomSource = new DOMSource(xslDoc);	    return tFactory.newTransformer(xslDomSource);	}	catch (javax.xml.transform.TransformerException e) {	    e.printStackTrace();	    return null;	}	catch (java.io.IOException e) {	    e.printStackTrace();	    return null;	}	catch (javax.xml.parsers.ParserConfigurationException e) {	    e.printStackTrace();	    return null;	}	catch (org.xml.sax.SAXException e) {		    e.printStackTrace();	    return null;	}    }}