XML文件解析初学习

下面是要解析的xml文件：

<?xml version="1.0" encoding="GB2312"?>

	<mp3s>
		<mp3>
			<name>
				AAA
			</name>
			<time>
				11111111
			</time>
		</mp3>
		
		<mp3>
			<name>
				BBB
			</name>
			<time>
				22222222
			</time>
		</mp3>
	</mp3s>

 

第一种方法：用DOM解析（不需要使用别的jar包）：

package cn.lifx.xml.parse;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomTest 
{
	private static final String path = "D:\\workspace\\XMLParseTest\\test.xml";
	private static DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	
	public static void main(String[] args)
	{
		File f = new File(path);
		
		try 
		{
			DocumentBuilder builder = factory.newDocumentBuilder();
			
			Document doc = builder.parse(f);
			
			NodeList values = doc.getElementsByTagName("mp3");
			
			for(int i=0; i<values.getLength(); i++)
			{
				System.out.println("name: " + doc.getElementsByTagName("name").item(i).getFirstChild().getNodeValue());
				
				System.out.println("time: " + doc.getElementsByTagName("time").item(i).getFirstChild().getNodeValue());
			}
			
		} catch(FileNotFoundException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch(SAXException e) {
			e.printStackTrace();
		} catch(IOException e) {
			e.printStackTrace();
		}
	}
}

 

第二种方法：用SAX（Simple API for XML）解析，需要使用sax.jar包

package cn.lifx.xml.parse;

import java.util.Stack;

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

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

public class SaxTest extends DefaultHandler
{
	private static final String path = "D:\\workspace\\XMLParseTest\\test.xml";
	private static Stack<String> tags = new Stack<String>();

	public SaxTest() 
	{
		super();
	}

	public static void main(String args[]) 
	{
		SAXParserFactory factory = SAXParserFactory.newInstance();
		
		try 
		{
			SAXParser parser = factory.newSAXParser();

			parser.parse(new InputSource(path), new SaxTest());

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void characters(char ch[], int start, int length) throws SAXException 
	{
		while(!tags.isEmpty())
		{
			String tag = tags.pop();
			
			if(tag.equals("name")) 
			{
				System.out.println("name：" + new String(ch, start, length));
			}
			else if(tag.equals("time")) 
			{
				System.out.println("time: " + new String(ch, start, length));
			}		
		}
	}

	public void startElement(String uri, String localName, String qName, Attributes attrs) 
	{
		tags.push(qName);
	}
}

 

 

第三种方法：使用jdom，需要下载jdom.jar包

package cn.lifx.xml.parse;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

public class JDomTest 
{
	private static final String path = "D:\\workspace\\XMLParseTest\\test.xml";
	
	public static void main(String[] args)
	{
		File f = new File(path);
		
		SAXBuilder builder = new SAXBuilder();
		
		Document doc = null;
		try 
		{
			doc = builder.build(f);
			
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		if(doc != null)
		{
			Element element = doc.getRootElement();
			
			List values = element.getChildren();
			
			for(int i=0; i<values.size(); i++)
			{
				System.out.println("name: " + ((Element)values.get(i)).getChild("name").getText());
				
				System.out.println("time: " + ((Element)values.get(i)).getChild("time").getText());
			}
		}
	}
}

 

 

第四种方法：使用dom4j，需要下载dom4j.jar包

package cn.lifx.xml.parse;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class Dom4jTest 
{
	public static void main(String[] args)
	{
		String path = "D:\\workspace\\XMLParseTest\\test.xml";
		
		File f = new File(path);
		
		SAXReader reader = new SAXReader();
		
		try 
		{
			Document doc = reader.read(f);
			Element root = doc.getRootElement();
			Element element;
			
			for(Iterator i=root.elementIterator("mp3"); i.hasNext();)
			{
				element = (Element) i.next();
				
				System.out.println("name: " + element.elementText("name"));
				System.out.println("time: " + element.elementText("time"));
			}
			
			
		} catch (DocumentException e) {
			e.printStackTrace();
		}
	}
}