XML的2种读取方式

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DOM

将XML文档换成一个对象模型的集合（DOM树），应用程序通过对模型的操作完成对XML数据的操作

File xmlfile=new File("D:/MyEclipse 10/test/WebRoot/NewFile.xml");DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();DocumentBuilder builder=null;try{    builder=factory.newDocumentBuilder();}catch(ParserConfigurationException e){    e.printStackTrace();}org.w3c.dom.Document doc=null;if(builder!=null){    try{        doc=builder.parse(xmlfile);    }catch(SAXException e){        e.printStackTrace();    }catch(IOException e){        e.printStackTrace();    }}if(doc!=null){    NodeList nl=doc.getElementsByTagName("name");    System.out.println(nl.item(0).getFirstChild().getNodeValue());}

SAX

按顺序访问

package tets;import java.io.File;import java.io.IOException;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;public class ReadXMLBySAX {    public static void main(String[] args) {        File xmlfile = new File("D:/MyEclipse 10/test/WebRoot/NewFile.xml");        SAXParserFactory factory = SAXParserFactory.newInstance();        SAXParser paser;        try {            paser = factory.newSAXParser();            paser.parse(xmlfile, new SAX());        } catch (ParserConfigurationException e) {            e.printStackTrace();        } catch (SAXException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}class SAX extends DefaultHandler {    @Override    public void startDocument() throws SAXException {        System.out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");    }    @Override    public void endDocument() throws SAXException {        System.out.println("\n 文档读取结束");    }    @Override    public void startElement(String uri, String localName, String name,            Attributes attributes) throws SAXException {        System.out.print("<" + name);        if (attributes != null) {            for (int i = 0; i < attributes.getLength(); i++) {                System.out.print(" " + attributes.getQName(i) + "=\""                        + attributes.getValue(i) + "\"");            }        }        System.out.print(">");    }    @Override    public void endElement(String uri, String localName, String name)            throws SAXException {        System.out.print("</" + name + ">");    }    @Override    public void characters(char[] ch, int start, int length)            throws SAXException {        System.out.print(new String(ch, start, length));    }}

hibernate和spring框架都是用DOM4J读取xml配置文件的，另外还有一个Java组件 JDOM=DOM的修改文件+SAX的读取快速

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