import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import org.junit.Test;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.XMLReader;

import org.xml.sax.helpers.DefaultHandler;

//这个SAXParser只能按顺序进行调用不能返回重复调用函数进行解析，

public class SAXDemo{

@Test

public void demo() throws Exception {

//1.获得SAXParser的工厂类

SAXParserFactory factory=SAXParserFactory.newInstance();

//2.获得SAXParser解析器

SAXParser parse=factory.newSAXParser();

//获得XMLReader对象

XMLReader read=parse.getXMLReader();

//这里是设置监听，要覆盖原来的函数就按shif+alt+s再按V再从里面进行选择

read.setContentHandler(new DefaultHandler(){

private String elementName="";

@Override

public void startElement(String uri, String localName,

String qName, Attributes attributes) throws SAXException {

if(qName.equals("user")){

String id=attributes.getValue("id");

System.out.println("id="+id);

}

else if(qName.equals("name")||qName.equals("age")){

elementName=qName;

}

}

@Override

public void endElement(String uri, String localName, String qName)

throws SAXException {

if(qName.equals("name")||qName.equals("age")){

elementName="";

}

if(qName.equals("user")){

System.out.println("-------------------------");}

}

@Override

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

throws SAXException {

if(!elementName.equals("")){

String str=new String(ch,start,length);

System.out.println(elementName+":"+str);

}

}

});

read.parse("./xml/users.xml");

}

}

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import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileReader;

import javax.xml.namespace.QName;

import javax.xml.stream.XMLEventReader;

import javax.xml.stream.XMLInputFactory;

import javax.xml.stream.XMLStreamException;

import javax.xml.stream.events.Characters;

import javax.xml.stream.events.StartElement;

import javax.xml.stream.events.XMLEvent;

import org.junit.Test;

import org.xml.sax.XMLReader;

public class STAdemo {

@Test

public void demo() throws Exception {

XMLInputFactory factory=XMLInputFactory.newInstance();

XMLEventReader read=factory.createXMLEventReader(new FileReader("./xml/users.xml"));

//这里跟SAXParser的差别在于XMLEventReader是有迭代器的它可以往上一级访问，而SAX不能只能一次惊醒访问，所以XML比SAX

//更加方便查询xml；

while(read.hasNext()){

XMLEvent en=read.nextEvent();

if(en.isStartElement()){

StartElement se=en.asStartElement();

if(se.getName().getLocalPart().equals("user")){

String id=se.getAttributeByName(new QName("id")).getValue();

System.out.println("ID="+id);

}

if(se.getName().getLocalPart().equals("name")){

Characters ch= read.nextEvent().asCharacters();

System.out.println("Name="+ch.toString());

}

if(se.getName().getLocalPart().equals("age")){

Characters chs=read.nextEvent().asCharacters();

System.out.println("age="+chs.toString());

}

}

if(en.isEndElement()){

if(en.asEndElement().getName().getLocalPart().equals("user")){

System.out.println("-------------------------");

}

}

}

}

}