JAXP SAX

External

• http://www.saxproject.org

Internal

• JAXP

Overview

A SAX parser implements event-driven, serial-access push parsing.

SAX parsers can only be used for state-independent processing, where the handling of an element does not depend on elements that came before, unlike StAX, which can be used for state-dependent processing.

Start by generating a parser instance with SAXParserFactory. The actual implementation of the parser implements the SAXParser interface and is determined by the value of javax.xml.parsers.SAXParserFactory system property. Then call parsers's parse() method. The parser contains a SAXReader instance, which invokes callback methods the application must implement. The methods are defined by the ContentHandler, ErrorHandler, DTDHandler and EntityResolver interfaces.

When an XML tag is recognized, the parser invokes the corresponding methods (startDocument(), startElement()), ...) on the ContentHandler implementation.

The ErrorHandler implementation is messaged on various parsing errors. The default implementation is rudimentary, if a more nuanced behavior is necessary, the handler must be implemented.

For a working example of SAX parsing, see SAX Example below.

SAX Example

SAX Example

Component Packages

• javax.xml.parsers defines SAXParserFactory and exception classes.
• org.xml.sax the basic SAX interfaces.