参考:
 
总结:
- 
javax.xml.parsers 
- Class: DocumentBuilder: Defines the API to obtain DOM Document instances from an XML document.
- Class: DocumentBuilderFactory: Defines a factory API that enables applications to obtain a parser that produces DOM object trees from xml documents. It can create a new instance of a DocumentBuilder.
- Class: SAXParser: Defines the API that wraps an XMLReader implementation class. Its instance can parse XML, similar to DocumentBuilder, but with difference.
- Class: SAXParserFactory: Defines a factory API that enables applications to configure and obtain a SAX based parser to parse XML documents. It can create a new instance of a SAXParser.
 
- org.w3c.dom
- Interface: Node:  primary datatype  for the entire Document Object Model (DOM). It can get, set, remove, replace any nodes.
 
java & xml parser
原文:http://www.cnblogs.com/hf-cherish/p/4028868.html