Java解析XML文件的四种方式

2019-06-23 03:07 阅读 143 次 评论 0 条

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);   
 }   
 }

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