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Transforming XML in Java is achieved using a Transformer. To use an XSL file for the transformation involves first creating Templates instance which can then be used to create the required Transformer.

TransformerFactory factory = TransformerFactory.newInstance();
Templates template = factory.newTemplates(
   new StreamSource(new FileInputStream(xslPath)));
Transformer transformer = template.newTransformer();
Source source = new StreamSource(new FileInputStream(xmlInputPath));
Result result = new StreamResult(new FileOutputStream(xmlOutputPath));
transformer.transform(source, result);

written by objects \\ tags: Templates, transform, Transformer, xsl

XSL is great for transforming an XML file. The following XSL can be used to convert all element names into lower case.

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:variable
       name="lcase">abcdefghijklmnopqrstuvwxyz</xsl:variable>
    <xsl:variable
       name="ucase">ABCDEFGHIJKLMNOPQRSTUVWXYZ</xsl:variable>

    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="*">
        <xsl:element name="{translate(local-name(),$ucase,$lcase)}">
            <xsl:apply-templates select="@*|node()"/>
        </xsl:element>
    </xsl:template>

</xsl:stylesheet>

How to transform XML using XSL may also be of interest to you.

written by objects \\ tags: xsl

A Transformer can be used to write the XML for a DOM Document to a String. As the name implies a Transformer transforms a Source object into a Result, in this case the Source is the DOM Document, and the Result is a StringWriter (which the resulting XML String can be extracted from).

TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
StringWriter writer = new StringWriter();
Result result = new StreamResult(writer);
Source source = new DOMSource(document);
transformer.transform(source, result);
writer.close();
String xml = writer.toString();

written by objects \\ tags: Document, DOM, StringWriter, Transformer