java读取xml文件的四种方法

Xml代码

<?xml version="1.0" encoding="GB2312"?>  
<RESULT>  
<VALUE>　　   
  <NO>A1234</NO>　　   
  <ADDR>河南省郑州市</ADDR>  
</VALUE>  
<VALUE>　　   
  <NO>B1234</NO> 　   
  <ADDR>河南省郑州市二七区</ADDR>  
</VALUE>  
</RESULT>

第一种 DOM 实现方法：

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_r("VALUE");   
   for (int i = 0; i < nl.getLength(); i++) {   
     System.out.print("车牌号码:"+ doc.getElementsByTagName_r("NO").item(i).getFirstChild().getNodeValue());   
     System.out.println("车主地址:"+ doc.getElementsByTagName_r("ADDR").item(i).getFirstChild().getNodeValue());   
    }   
   } catch (Exception e) {   
    e.printStackTrace();   
   }   
}   
}  

第二种，DOM4J实现方法

import java.io.*;   
import java.util.*;   
import org.dom4j.*;   
import org.dom4j.io.*;   
  
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();   
   }   
}   
}  

第三种 JDOM实现方法：

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();   
   }   
}   
}

第四种SAX实现方法：

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);   
}   
}