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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Transmitting XML between different applications
Mukul Gandhi wrote:
> I want to understand the below statement, you have
> written.. "not if you serialize it using the default
> Java object serialization". Is it possible to
> serialize Java DOM objects by some other methods than
> default Java serialization method? How is it
> implemented, and would it make Java DOM objects parser
> neutral?
Mukul,
There are two standard ways to serialise a Java DOM Document.
1. Use the DOM Load & Save facility if your DOM implementation supports
it, as this is likely to be more efficient:
http://www.w3.org/TR/DOM-Level-3-LS/
Check whether the implementation supports it as follows:
Document doc = ...;
DOMImplementation impl = doc.getImplementation();
if (impl.hasFeature("LS", "3.0")) {
DOMImplementationLS ls = (DOMImplementation) impl.getFeature("LS",
"3.0");
LSSerializer serializer = ls.createLSSerializer();
LSOutput output = ls.createLSOutput();
// configure output ...
serializer.write(doc, output);
}
GNU JAXP and Apache Xerces support DOM Load & Save.
2. Use a JAXP identity transformer to serialise to a StreamResult.
Document doc = ...;
Transformer identityTransformer =
TransformerFactory.getInstance().newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(...);
identityTransformer.transform(source, result);
Both these methods serialise to an OutputStream. The resulting stream
of characters is an XML document. It is as "parser neutral" as any XML
document - any XML parser parses XML. A DOM Document is not an XML
document, and is not XML. It is an application-internal representation
of an XML document in memory. The XML document is the sequence of bytes
beginning e.g. '<', '?', 'x', 'm', 'l', etc. Use XML as the transfer
format between different applications.
--
Chris Burdess
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