1、DOM方式解析XML

    给予DOM的解析方式，是把整个XML文档加载到内存，转化成DOM树，可以随机的访问DOM树的任何数据，速度快、比较灵活，但是消耗资源比较多，不适用大的xml文档解析，测试超过10M内存溢出。

public class DOM01 {    public static void printAttr(Node node){        NamedNodeMap map = node.getAttributes();        for(int i=0;i

2、SAX方式解析xml

    SAX工作原理是对文档顺序扫描，当扫描到文档开始与结束、元素开始结束等地方时通知回调函数做出相应的动作，然后继续扫描，直至文档结束。消耗资源比较少，适合大文档解析，但是只能读取不能修改，开发也较复杂。

public class SAX extends DefaultHandler{		private List
    
      students = null;	private Student student = null;	private String preTag = null;//记录上一个节点名称		@Override	public void startDocument() throws SAXException {		System.out.println("开始读取学生信息");		students  = new ArrayList
     
      ();	}	@Override	public void endDocument() throws SAXException {		System.out.println("\n 信息读取完毕");	}	@Override	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {		if("student".equals(qName)){			student = new Student();			student.setId(attributes.getValue(0));		}preTag = qName;	}	@Override	public void endElement(String uri, String localName, String qName) throws SAXException {		if("student".equals(qName)){			 students.add(student);			 student = null;		}preTag = null;	}	@Override	public void characters(char[] ch, int start, int length) throws SAXException {		if(preTag != null){			String content = new String(ch, start, length);			if("name".equals(preTag)){				student.setName(content);			}else if("sex".equals(preTag)){				student.setSex(content);			}else if("age".equals(preTag)){				student.setAge(content);			}		}	}	public static void main(String[] args) throws Exception{		SAXParserFactory factory = SAXParserFactory.newInstance();		SAXParser parser = factory.newSAXParser();		SAX sax = new SAX();		parser.parse("src/student.xml", sax);		for(Student student : sax.students){			System.out.println(student);		}	}	}
     
    

JDOM和DOM4j解析xml：

两个都是解析XML优秀的框架，但是两者也有区别，具体可以参考http://www.cnblogs.com/zhi-hao/p/4016363.html

JDOM封装xml实例：

public class JDOM01 {	public static void main(String[] args) throws Exception{		Element student = new Element("student");				Attribute id = new Attribute("id", "001"); 		Attribute aa = new Attribute("aa", "xx"); 		student.setAttribute(id);		student.setAttribute(aa);				Element name = new Element("name");		Element age = new Element("age");		Element sex = new Element("sex");				name.setText("张三");		student.addContent(name);		sex.setText("男");		student.addContent(sex);		age.setText("18");		student.addContent(age);				Document document = new Document(student);		XMLOutputter outputter = new XMLOutputter();		outputter.setFormat(outputter.getFormat().setEncoding("UTF-8"));				outputter.output(document, new FileOutputStream("src/student2.xml"));	}}

JDOM解析xml实例：

public class JDOM02 {	public static void main(String[] args) throws Exception{		SAXBuilder builder = new SAXBuilder();		Document document = builder.build("src/student.xml");		Element students = document.getRootElement();		List studentList = students.getChildren("student");		for(int i=0;i

DOM4j封装xml实例：

public class DOM4j01 {	public static void main(String[] args) throws Exception{		Document document = DocumentHelper.createDocument();		Element studentElement = document.addElement("student");		studentElement.addAttribute("id", "001");		studentElement.addAttribute("aa", "xx");		Element name = studentElement.addElement("name");		name.setText("张三");		Element sex = studentElement.addElement("sex");		sex.setText("男");		Element age = studentElement.addElement("age");		age.setText("20");				OutputFormat format = OutputFormat.createPrettyPrint();		format.setEncoding("UTF-8");		XMLWriter writer = new XMLWriter(new FileOutputStream("src/student3.xml"),format);		writer.write(document);		writer.close();	}}

DOM4j解析xml实例：

public class DOM4j02 {	public static void main(String[] args) throws Exception{		SAXReader saxReader = new SAXReader();		Document doc =  saxReader.read("src/student.xml");				Element rootElement = doc.getRootElement();		@SuppressWarnings("rawtypes")		Iterator iter = rootElement.elementIterator();		while(iter.hasNext()){			Element studentElement = (Element)iter.next();			System.out.println("学号："+studentElement.attributeValue("id"));			System.out.println("姓名："+studentElement.elementText("name"));			System.out.println("=========================================");		}	}}

总的来说DOM4J是最好的，目前许多开源项目中也大量采用 DOM4J，例如大名鼎鼎的 Hibernate 也用 DOM4J 来读取 XML 配置文件。如果不考虑可移植性，那就采用DOM4J吧