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POReading multiple xml documents from a socket in java
 

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  1. POReading multiple xml documents from a socket in java
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    <p>I'm writing a client which needs to read multiple consecutive small XML documents over a socket. I can assume that the encoding is always UTF-8 and that there is optionally delimiting whitespace between documents. The documents should ultimately go into DOM objects. What is the best way to accomplish this? </p> <p>The essense of the problem is that the parsers expect a single document in the stream and consider the rest of the content junk. I thought that I could artificially end the document by tracking the element depth, and creating a new reader using the existing input stream. E.g. something like:</p> <pre><code>// Broken public void parseInputStream(InputStream inputStream) throws Exception { XMLInputFactory factory = XMLInputFactory.newInstance(); XMLOutputFactory xof = XMLOutputFactory.newInstance(); XMLEventFactory eventFactory = XMLEventFactory.newInstance(); DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); Document doc = documentBuilder.newDocument(); XMLEventWriter domWriter = xof.createXMLEventWriter(new DOMResult(doc)); XMLStreamReader xmlStreamReader = factory.createXMLStreamReader(inputStream); XMLEventReader reader = factory.createXMLEventReader(xmlStreamReader); int depth = 0; while (reader.hasNext()) { XMLEvent evt = reader.nextEvent(); domWriter.add(evt); switch (evt.getEventType()) { case XMLEvent.START_ELEMENT: depth++; break; case XMLEvent.END_ELEMENT: depth--; if (depth == 0) { domWriter.add(eventFactory.createEndDocument()); System.out.println(doc); reader.close(); xmlStreamReader.close(); xmlStreamReader = factory.createXMLStreamReader(inputStream); reader = factory.createXMLEventReader(xmlStreamReader); doc = documentBuilder.newDocument(); domWriter = xof.createXMLEventWriter(new DOMResult(doc)); domWriter.add(eventFactory.createStartDocument()); } break; } } } </code></pre> <p>However running this on input such as &lt;a&gt;&lt;/a&gt;&lt;b&gt;&lt;/b&gt;&lt;c&gt;&lt;/c&gt; prints the first document and throws an XMLStreamException. Whats the right way to do this?</p> <p>Clarification: Unfortunately the protocol is fixed by the server and cannot be changed, so prepending a length or wrapping the contents would not work. </p>
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    1. COCan't you just catch the XMLStreamException and use it as a trigger to parse the input stream again for the next document?
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