xml解析：Sax,Dom,pull解析

Sax

1.startDocument()文档开始

2.endDocument()文档结束

3.startElement(String namespaceURI,String localName,String qName,Attributes atts);

元素开始,localName是元素名

1.4endElement(String uri, String localName, String name)事件

1.5characters(char[] ch, int start, int length)

SAXParserFactory spf = SAXParserFactory.newInstance();//工厂

SAXParser saxParser = spf.newSAXParser();//解析器

//XMLContextHandler extends DeafaultHandler

XMLContextHandler handler = new XMLContextHandler();

saxParser.parse(inStream,handler);

inStream.close();

return handler.getPersons();

每当遍历到文本节点时，会触发该事件

public void characters(char[] ch,int start,in length);

DOM

DocumentBuilder builder = DocumentBuilderFactory.newDocumentBuilder();

Document dom = builder.parse(inStream);

Element root = dom.getDocumentElement();

NodeList items = root.getElementsByTagName("person");//查找所有person节点