XSLT with Java and Dom4j-1.6

Feeling geeky again!!

Today I´ll show you how to perform an XSLT (XSL transformation) on an XML file using Java and Dom4j. In contrast with the last Java/Dom4j post in this i´ll only show the class that acually performs the transformation. Dom4j is not able to perform the transformation on its own, it needs the help of JAXP:

 package com.julio.xml;

 import java.io.File;

 import java.io.FileWriter;
 import java.io.IOException; // dom4j import
 import org.dom4j.Document;
 import org.dom4j.DocumentException;

 import org.dom4j.io.SAXReader;
 import org.xml.sax.ErrorHandler;
 import org.xml.sax.SAXException;
 import org.xml.sax.SAXParseException;


 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerConfigurationException;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;

 import javax.xml.transform.stream.StreamSource;

 import org.dom4j.io.DocumentResult;
 import org.dom4j.io.DocumentSource;
 import org.dom4j.io.DocumentSource;

 import org.dom4j.io.XMLWriter;
 import org.dom4j.io.OutputFormat;

 public class XmlTransformer {

  // The input XML file
  private File input;
  // The DOM document for the imput file

  private Document inputDoc;
  // Guess what!!!!
  private File output;

  // The xslt file
  private File transformation;

  public XmlTransformer(File input, File transformation) {

   this.input = input;
   this.transformation = transformation;

  }

  public File transform() throws IOException {

   // Need to create a factory using JAXP
   TransformerFactory factory = TransformerFactory.newInstance();

   try {
    // Now get a transformer using the facory
    Transformer transformer = factory.newTransformer(new StreamSource(

      transformation));
    // Convert the input file into a DOM document
    this.createDoc();

    // Dom4j support for trasnformations
    DocumentSource source = new DocumentSource(this.inputDoc);

    DocumentResult result = new DocumentResult();
    try {

     // OK lets do the actual transformation
     transformer.transform(source, result);
     // The rest is boiler plate code!!!

     Document outputDoc = result.getDocument();
     OutputFormat format = OutputFormat.createPrettyPrint();

     output = new File("output.xml");
     XMLWriter writer = new XMLWriter(new FileWriter(output), format);

     writer.write(outputDoc);
     writer.close();

    } catch (TransformerException e) {
     // TODO Auto-generated catch block

     e.printStackTrace();
    }
   } catch (TransformerConfigurationException e) {

    // TODO Auto-generated catch block
    e.printStackTrace();
   }

   return output;
  }

  private void createDoc() {

   SAXReader reader = new SAXReader(false);
   try {

    this.inputDoc = reader.read(this.input);

   } catch (DocumentException e) {
    // TODO Auto-generated catch block

    e.printStackTrace();
   }
  }

 }

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