How to create a packet by using java?

Hi, i am currently working on a research and i have some problems here.
1) how to create a packet by using java programming ?
2) How can i set the packet's information (e.g: packet's length, size of its header, etc) by using java?
I am currently in a midst of this now and i hope that someone is willing to correspond to my questions and help me out of it.
Thank you!

I wan to create a customize packet where the user can
define the header size, the packet's length etc. in
the program......Then you get to write it to the connection yourself. Look at the OutputStream classes to see how to write low level output to a connection.

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Sax.startDocument();
Sax.startValidation();
Sax.startElement("", "pdf", "pdf", new AttributesImpl());
Sax.startElement("", "basic-metadata", "basic-metadata", new AttributesImpl());
String xmp_str = new String(meta_data.getByteArray(),"UTF8");
char[] xmp_arr = xmp_str.toCharArray();
Sax.characters(xmp_arr, 0, xmp_arr.length);
</code><code>Sax.endElement("", "basic-metadata", "basic-metadata");</code>
<code class="jive-code jive-java">Sax.endElement("", "pdf", "pdf");
Sax.endValidation();
Sax.endDocument();
* I HAVE CHANGED MY AS PER YOUR SUGGESTION, NOW SAME RESULT HAS COMING.
* I AM NOT ABLE TO GET THE EXACT OUTPUT.,WHY THAT ?
Thanks,
JavaImran{code}

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