Parsing with Java SAX from a UDP socket

[hotrod7262]

I'm trying to accept UDP multicast XML messages and parse them. The current way I'm doing so is by creating a new File for each message and then calling parser.parse(filename.xml) This way works. However, I think the frequent File I/O is causing performance problems. Is there a way I can do this without doing File I/O? The parse() method allows an InputStream but I don't know how to get an InputStream. Here's my current code:

MulticastSocket s = new MulticastSocket(port);
s.joinGroup(InetAddress.getByName(group));

while(true){
byte[] buf = new byte[10240];
DatagramPacket recv = new DatagramPacket(buf, buf.length);
s.receive(recv);

//a.xml is a temporary file where the message is written
String outFile = "a.xml";
File out_file = new File(outFile);
out_file.deleteOnExit();

FileOutputStream xml_temp = new FileOutputStream(out_file);
xml_temp.write(buf,0,recv.getLength());
try{
parser.parse(out_file, SAXHandler);
}
catch (Exception e)
{System.out.println("Parser had an error:" + e);}
}