SAX方式解析XML实例

SAX方式解析XML实例

XML文件：

 <?xml version="1.0" encoding="UTF-8"?>
<contacts>
	<contact id="1">
		<name>zhangsan</name>
		<sex>man</sex>
		<mobile>13880246907</mobile>
		<group>
			<id>11</id>
			<name>同事</name>
		</group>
	</contact>
	<contact id="2">
		<name>lisi</name>
		<sex>man</sex>
		<mobile>15828587260</mobile>
		<group>
			<id>21</id>
			<name>家人</name>
		</group>
	</contact>
</contacts>

SAX解析核心工厂调用代码

package com.leiht.xml.sax4xml;

import java.util.List;




import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import com.leiht.xml.entity.Contact;

public class SaxParseXML {
	
	
	public List<Contact> parse(String fileName) {
		
		List<Contact> contacts = null;
		
		try {
			SAXParserFactory factory = SAXParserFactory.newInstance();
			SAXParser parser = factory.newSAXParser();
			ContactSaxHandler handler = new ContactSaxHandler();
			
			parser.parse(fileName, handler);
			
			contacts = handler.getResult();
			
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return contacts;
	}
}

SAX解析核心代码

package com.leiht.xml.sax4xml;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.leiht.xml.entity.Contact;
import com.leiht.xml.entity.Group;

public class ContactSaxHandler extends DefaultHandler {
	
	private List<Contact> contacts = null;
	
	private Contact contact = null;
	private Group group = null;
	
	private ContactEumState contactEumState = ContactEumState.none;
	private boolean isGroupState = false;
	
	public List<Contact> getResult() {
		return contacts;
	}
	
	@Override
	/*
	 * (non-Javadoc)
	 * @see org.xml.sax.helpers.DefaultHandler#startDocument()
	 * 解析文档开始 接收文档开始的通知
	 */
	public void startDocument() throws SAXException {
		contacts = new ArrayList<Contact>();
	}
	
	@Override
	/*
	 * (non-Javadoc)
	 * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
	 * @接收元素开始的通知 即开始读XML文档的标签
 	 */
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		
		//读取contact节点，读ID
		if(qName.equals("contact")) {
			contact = new Contact();
			contact.setId(Integer.parseInt(attributes.getValue("id")));
			return;
		}
		
		if(qName.equals("name")) {
			if(!isGroupState) {
				contactEumState = ContactEumState.contactName;
			}
			if(isGroupState) {
				contactEumState = ContactEumState.groupName;
			}
			return;
		}
		
		if(qName.equals("sex")) {
			contactEumState = ContactEumState.sex;
			return;
		}
		
		if(qName.equals("mobile")) {
			contactEumState = ContactEumState.mobile;
			return;
		}
		
		if(qName.equals("group")) {
			group = new Group();
			isGroupState = true;
			return;
		}
		
		if(qName.equals("id")) {
			contactEumState = ContactEumState.groupId;
			return;
		}
		
	}
	
	@Override
	/*
	 * (non-Javadoc)
	 * @see org.xml.sax.helpers.DefaultHandler#characters(char[], int, int)
	 * 读每个TAG之间的内容
	 */
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		String result = new String(ch, start,length);
		
		switch (contactEumState){
			case contactName :
				contact.setName(result);
				contactEumState = ContactEumState.none;
				break;
			case mobile :
				contact.setMobile(result);
				contactEumState = ContactEumState.none;
				break;
			case sex :
				contact.setSex(result);
				contactEumState = ContactEumState.none;
				break;
			case groupId :
				group.setId(result);
				contactEumState = ContactEumState.none;
				break;
			case groupName :
				group.setName(result);
				contactEumState = ContactEumState.none;
				break;
			default: break;
		}
		
	}
	
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if(qName.equals("group")) {
			isGroupState = false;
			contact.setGroup(group);
			group = null;
			
			return;
		}
		
		if(qName.equals("contact")) {
			contacts.add(contact);
			contact = null;
			return;
		}
	}
	
	@Override
	public void endDocument() throws SAXException {
		System.out.println("解析完成");
	}
	
}

用的枚举类

package com.leiht.xml.sax4xml;

public enum ContactEumState {
	contactName,mobile,sex,groupId,groupName,none
}

调用测试

package com.leiht.xml.view;

import java.util.List;

import com.leiht.xml.dom4xml.DomParseXML;
import com.leiht.xml.entity.Contact;
import com.leiht.xml.sax4xml.SaxParseXML;

public class Test {
	public static void main(String[] args) {
		//DomParseXML domParseXML = new DomParseXML();
		//List<Contact> contacts = domParseXML.parse("xml/contact.xml");
		SaxParseXML samParseXML = new SaxParseXML();
		List<Contact> contacts = samParseXML.parse("xml/contact.xml");
		for(Contact contact : contacts){
			System.out.println(contact);
		}
		
	}
}