java读取xml文件的方法汇总

<pre name="code" class="java">import java.io.File;

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

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

public class MyXMLReader2DOM {
	public static void main(String arge[]) {

		long lasting = System.currentTimeMillis();

		try {
			File f = new File("data_10k.xml");
			DocumentBuilderFactory factory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document doc = builder.parse(f);
			NodeList nl = doc.getElementsByTagName("VALUE");
			for (int i = 0; i < nl.getLength(); i++) {
				System.out.print("车牌号码:"
						+ doc.getElementsByTagName("NO").item(i)
								.getFirstChild().getNodeValue());
				System.out.println("车主地址:"
						+ doc.getElementsByTagName("ADDR").item(i)
								.getFirstChild().getNodeValue());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

第二种方法   DOM4J

       DOM4J 是一个非常非常优秀的Java XML API，具有性能优异、功能强大和极端易用使用的特点，同时它也是一个开放源代码的软件。如今你可以看到越来越多的 Java 软件都在使用 DOM4J 来读写 XML，特别值得一提的是连 Sun 的 JAXM 也在用 DOM4J。 

public class MyXMLReader2DOM4J {   
public static void main(String arge[]) {   
  long lasting = System.currentTimeMillis();   
  try {   
    File f = new File("data_10k.xml");   
    SAXReader reader = new SAXReader();   
    Document doc = reader.read(f);   
    Element root = doc.getRootElement();   
    Element foo;   
    for (Iterator i = root.elementIterator("VALUE"); i.hasNext();) {   
     foo = (Element) i.next();   
     System.out.print("车牌号码:" + foo.elementText("NO"));   
     System.out.println("车主地址:" + foo.elementText("ADDR"));   
    }   
   } catch (Exception e) {   
    e.printStackTrace();   
   }   
 }   
}  

       为减少DOM、SAX的编码量，出现了JDOM；优点：20-80原则，极大减少了代码量。使用场合：要实现的功能简单，如解析、创建等，但在底层，JDOM还是使用SAX（最常用）、DOM、Xanan文档。 

import java.io.*;   
import java.util.*;   
import org.jdom.*;   
import org.jdom.input.*;   
  
public class MyXMLReader2JDOM {   
public static void main(String arge[]) {   
  long lasting = System.currentTimeMillis();   
  try {   
    SAXBuilder builder = new SAXBuilder();   
    Document doc = builder.build(new File("data_10k.xml"));   
    Element foo = doc.getRootElement();   
    List allChildren = foo.getChildren();   
   for (int i = 0; i < allChildren.size(); i++) {   
     System.out.print("车牌号码:"+ ((Element) allChildren.get(i)).getChild("NO").getText());   
     System.out.println("车主地址:"+ ((Element) allChildren.get(i)).getChild("ADDR").getText());   
    }   
   } catch (Exception e) {   
    e.printStackTrace();   
   }   
  }   
}  

为解决DOM的问题，出现了SAX。SAX ，事件驱动。当解析器发现元素开始、元素结束、文本、文档的开始或结束等时，发送事件，程序员编写响应这些事件的代码，保存数据。优点：不用事先调入整个文档，占用资源少；SAX解析器代码比DOM解析器代码小，适于Applet，下载。缺点：不是持久的；事件过后，若没保存数据，那么数据就丢了；无状态性；从事件中只能得到文本，但不知该文本属于哪个元素；使用场合：Applet;只需XML文档的少量内容，很少回头访问；机器内存少； 

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 MyXMLReader2SAX extends DefaultHandler {   
  
java.util.Stack tags = new java.util.Stack();   
  
public MyXMLReader2SAX() {   
  super();   
}   
  
public static void main(String args[]) {   
  long lasting = System.currentTimeMillis();   
  try {   
    SAXParserFactory sf = SAXParserFactory.newInstance();   
    SAXParser sp = sf.newSAXParser();   
    MyXMLReader2SAX reader = new MyXMLReader2SAX();   
    sp.parse(new InputSource("data_10k.xml"), reader);   
   } catch (Exception e) {   
    e.printStackTrace();   
   }   
  
   System.out.println("运行时间：" + (System.currentTimeMillis() - lasting)   
     + "毫秒");   
}   
  
public void characters(char ch[], int start, int length)   
   throws SAXException {   
   String tag = (String) tags.peek();   
  if (tag.equals("NO")) {   
    System.out.print("车牌号码：" + new String(ch, start, length));   
   }   
  if (tag.equals("ADDR")) {   
    System.out.println("地址:" + new String(ch, start, length));   
   }   
}   
  
public void startElement(String uri, String localName, String qName,   
    Attributes attrs) {   
   tags.push(qName);   
  }   
}  

原文：http://blog.csdn.net/bobozhanghb/article/details/51356146