Java API for XML Processing

The Java API for XML Processing (JAXP) is for processing XML data using applications written in the Java programming language

这部分内容主要提纲挈领的讲讲JAXP，讲讲他的几个重要部分，基本的工作原理，还有重要的api。

这是几个重要的工厂

SAXParserFactory, DocumentBuilderFactory, and TransformerFactory--which give you a SAXParser, a DocumentBuilder, and an XSLT transformer

The factory APIs let you plug in an XML implementation offered by another vendor without changing your source code. 是这些工厂的重要之处。

 

几个重要的包：

javax.xml.parsers: The JAXP APIs, which provide a common interface for different vendors' SAX and DOM parsers

org.w3c.dom: Defines the Document class (a DOM) as well as classes for all the components of a DOM

org.xml.sax: Defines the basic SAX APIs

javax.xml.transform: Defines the XSLT APIs that let you transform XML into other forms

 

SAX APIs

SAXParserFactory:用来获取一个Parser实例的。

SAXParser:定义了几个parser()函数，需要传入XML Source和handler的对象。

SAXReader:SAXParser wraps SAXReader（需要看看）

DefaultHandler，ContentHandler，ErrorHandler，DTDHandler ，EntityResolver

重要的package:
org.xml.sax：
org.xml.sax.ext
org.xml.sax.helpers

DOM APIs

通过DocumentBuilderFactory 获得一个DocumentBuilder的实例，再通过DocumentBuilder的实例来获得.Document的对象。

org.w3c.dom：

javax.xml.parsers ：Defines the DocumentBuilderFactory class and the DocumentBuilder class, which returns an object that implements the W3C Document interface.

 

XSLT APIs

A source object can be created from a SAX reader, from a DOM, or from an input stream. Similarly, the result object is the result of the transformation process. That object can be a SAX event handler, a DOM, or an output stream.

javax.xml.transform： Defines the TransformerFactory and Transformer classes
javax.xml.transform.dom：
javax.xml.transform.sax：
javax.xml.transform.stream ：

javax.xml.parsers ： Defines the SAXParserFactory class, which returns the SAXParser. Also defines exception classes for reporting errors.