How to merge 2 XML streams in Java by XSLT

Question

I'd like to merge 2 XML streams (strings) in Java, necessarily by XSLT (that I could change the transformation), but the problem is that the XMLs come as a string. There are many examples, but through the files. Can this be done without saving them in files?

Thanks.

Answer 1

Have a look at this tutorial, it has all you need (with examples).

If you want to transform XML that comes in in String format, use something like:

Templates template = ...;
String xml = ...;
Transformer transformer = template.newTransformer();
Writer out = new StringWriter();
transformer.transform(new StreamSource(new StringReader(xml)), new StreamResult(out));

Answer 2

I only know about a way using an own implementation of URIResolver.

public final class StringURIResolver implements URIResolver {
    Map<String, String> documents = new HashMap<String, String>();

    public StringURIResolver put(final String href, final String document) {
        documents.put(href, document);
        return this;
    }

    public Source resolve(final String href, final String base)
    throws TransformerException {
        final String s = documents.get(href);
        if (s != null) {
            return new StreamSource(new StringReader(s));
        }
        return null;
    }
}

Use it like this:

final String document1 = ...
final String document2 = ...
final Templates template = ...
final Transformer transformer = template.newTransformer();
transformer.setURIResolver(new StringURIResolver().put("document2", document2));
final StringWriter out = new StringWriter();
transformer.transform(new StreamSource(new StringReader(document1)),
    new StreamResult(out));

And in the transform, reference it like this:

<xsl:variable name="document2" select="document('document2')" />