[jdom-interest] Request for help: building a document from an InputStream

Matthew MacKenzie matt at xmlglobal.com
Thu Aug 16 09:38:07 PDT 2001

You might build a little bit of a protocol, so the message looked 
something like:

LEN 29
<?xml version="1.0"?>
<mydoc />

LEN == Byte length, this way you could read LEN bytes then build the 
document - OR implement your own builder that encapsulated that.

Just an idea.  If you are doing raw sockets, you need to have a little 
bit of a protocol, otherwise just use HTTP.


Bob Tykulsker wrote:

>Hello World,
>I have a java application that is listening on a socket.
>I am sending XML that looks like:
>	<?xml version="1.0" encoding="UTF-8"?>
>	<message>
> 		<message_name>request_login</message_name>
> 		<username>joy</username>
>	</message>
>I thought I could use code like:
>	Buffered Reader	sin    = new BufferedReader(new
>	SAXBuilder  	builder= new SAXBuilder();
>	Document    	doc    = builder.build(sin);
>in one fell swoop, but application doesn't seem to get anything until
>interrupt it, at which point it throws the following exception:
>org.jdom.JDOMException: Error on line 8: The XML declaration may only appear
>at the very beginning of the document.
>I *CAN* work around this by writing the document without newlines, reading
>the socket a line at a time
>and building the document from a String as per the FAQ:
>	while (true) {
>		String  	line 		= sin.readLine();
>		if (line.indexOf("xml version") != -1) continuue;
>		Document doc = new SAXBuilder().build(new StringReader(line));
> 	}
>Any suggestions?
>Thanks in advance,
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