XMLReader parser =
         XMLReaderFactory.createXMLReader(PARSER_NAME);
      parser.setContentHandler(bestDeal.getContentHandler());
      parser.parse(args[0]);

方法2)用类 SAXParserFactory

示例
static public void main(String[] args)
{
 String filename = null;
 boolean validation = false;
 filename="9-21.xml";
 SAXParserFactory spf = SAXParserFactory.newInstance();
 SAXParser saxParser=null;
 try {
  saxParser = spf.newSAXParser();
 } catch (Exception ex) {
                 System.err.println(ex);
  System.exit(1);
 }
 try {
 saxParser.parse(new File(filename),new SAXReader());
 } catch (SAXException se) {
  System.err.println(se.getMessage());
                 System.exit(1);
                }

并且我发现这两个类在的包也不一样.分别是org.xml.sax 和 javax.xml.parsers
!

希望路过的高手指点一二!

楼上其实说的很对，实际上jaxp只是使用了提供的sax(apache)，进行了重新的封装，也就是实际上是jaxp来调用xerces。

在jaxp（第二个例子）里面最后使用SAXParser 来解析，读取数据吗？

我把它的文档挑了一点出来。

public abstract class SAXParser
extends java.lang.Object
Defines the API that wraps an XMLReader implementation class. In JAXP 1.0, this class wrapped the Parser interface, however this interface was replaced by the XMLReader. For ease of transition, this class continues to support the same name and interface as well as supporting new methods. An instance of this class can be obtained from the SAXParserFactory.newSAXParser() method. Once an instance of this class is obtained, XML can be parsed from a variety of input sources. These input sources are InputStreams, Files, URLs, and SAX InputSources.

也就是说最后SAXParser还是调用xerces里面的XMLReader来完成操作。

参考：http://people.apache.org/~edwingo/jaxp-ri-1.2.0-fcs/docs/api/javax/xml/parsers/SAXParser.html
　　　[URL=http://webmail.vh.com.tw/Microsoft/%B8%F3%A5%AD%A5xe%A4%C6%B5{%A6%A1%B3]%ADp-XML-Java-SOAP%BE%E3%A6X%C0%B3%A5%CE/3.htm]XML解析器[/URL]

http://blog.itfans.name/?p=35