Re: Processing XML
Re: Processing XML
- Subject: Re: Processing XML
- From: Arturo Pérez <email@hidden>
- Date: Tue, 13 Jan 2004 23:38:00 -0500
On Jan 13, 2004, at 11:12 PM, Greg Hulands wrote:
HI,
I have never had a need to parse xml before so I am not quite sure how
to do it. I am implementing a credit card payment component for my
system and the credit card gateway sends and receives xml documents. I
can easily generate the xml in a component to send to the gateway, by
I am not sure how to parse the returned xml document. Below is an
example:
I don't know how much of a neophyte you are so I'll give a real basic
tutorial here.
For parsing XML there are essentially two types of parsers. They are
known as SAX parsers and
DOM parsers. SAX parsers are event-driven. They basically use a
callback model to execute code
one writes whenever anything interesting happens in the XML that is
being parsed. The DOM parsers
build the entire XML document into a tree structure in memory so that
one may query it repeatedly.
SAX parsers are faster but in essence require a single pass through the
document. One may not
request first this bit then that bit. DOM parsers use a lot of memory
and tend to be a little
slower.
In reality, there is a third kind of parser. Just read the data into a
big string and
run String.indexOf over it. For real simple stuff that may be
sufficient.
WO comes with a DOM parse (it's called WOMessage.contentAsDOMDocument
http://developer.apple.com/documentation/WebObjects/Reference/API/com/
webobjects/appserver/WOMessage.html#contentAsDOMDocument()). That's
what I always used and it was sufficiently
fast for my purposes (faster than some of the SAX parsers out there).
Another very popular choice amongst my former coworkers was JDOM.
----
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