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XML- SAX Parser using JAXP API |
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great extend.
SAX is very useful when the document is large.
DOM reads the entire XML structure and holds
the object tree in memory, so it is much more
CPU and memory intensive. For that reason,
the SAX API are preferred for server-side
applications and data filters that do not require
any memory intensive representation of the
data.
Overview of JAXP API’s
JAXP (Java API for XML Processing) doesn’t do
any kind of processing instead it provides a
mechanism to obtain parsed XML documents
employing SAX and DOM parsers. JAXP
provides a mechanism to plug-in with various
providers (supporting standard specifications
for DOM, SAX and XSLT). JAXP also specifies
which provider to use.
Overview of the main JAXP API Packages
The libraries that define needed JAXP APIs
are:
JAXP APIs |
Description |
javax.xml.parsers |
The JAXP APIs provide a common interface for different vendors' to use SAX and DOM parsers. |
org.w3c.dom |
Defines the Document class (a DOM) along with the classes for all of the components of a DOM. |
org.xml.sax |
Defines the basic SAX APIs. |
javax.xml.transform |
Defines the XSLT APIs that let's to transform XML into other forms. |
javax.xml.transform Defines the XSLT APIs
that let’s to transform XML into other forms.
The SAX API is defined in org.xml.sax package
of JAXP-APIs. The “Simple API” for XML (SAX)
is the event-driven, serial-access mechanism
that does element-by-element processing. The
API for this level reads and writes XML to a
data repository or the Web. |
|
The DOM API is defined in org.w3c.dom package
of JAXP-APIs. The DOM API is easier to use. It
provides a tree structure of objects. The DOM
API is used to manipulate the hierarchy of
application objects it encapsulates.
The XSLT APIs defined in javax.xml.transform
package of JAXP-APIs. The XSLT APIs let you
convert XML data to into other forms.
javax.xml.parsers —Description
Provides classes to process XML documents and
supports two types of plugable parsers ie. SAX
and DOM Here are the following classses defined
in javax.xml.parsers package:
| Classes |
Description |
DocumentBuilder |
Defines the API to obtain DOM Document instances from an XML document. |
DocumentBuilderFactory |
Defines a factory API that enables applications to obtain a parser that produces DOM object trees from XML documents |
SAXParser |
Defines the API that wraps an XMLReader implementation class |
SAXParserFactory |
Defines a factory API that enables applications to configure and obtain a SAX based parser to parse XML documents |
This package contains two vendor-neutral
factory classes: SAXParserFactory (builds a
SAXParser) and DocumentBuilderFactory |
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Feb
2008 | Java Jazz Up | 25 |
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