java读取 xml文件

java读取xml文件的四种方法

 转自https://www.cnblogs.com/lingyao/p/5708929.html

Xml代码

 1 <?xml version="1.0" encoding="GB2312"?>  
 2 <RESULT>  
 3 <VALUE>　　   
 4   <NO>A1234</NO>　　   
 5   <ADDR>河南省郑州市</ADDR>  
 6 </VALUE>  
 7 <VALUE>　　   
 8   <NO>B1234</NO> 　   
 9   <ADDR>河南省郑州市二七区</ADDR>  
10 </VALUE>  
11 </RESULT>

第一种 DOM 实现方法：

 1 import java.io.File;   
 2   
 3 import javax.xml.parsers.DocumentBuilder;   
 4 import javax.xml.parsers.DocumentBuilderFactory;   
 5   
 6 import org.w3c.dom.Document;   
 7 import org.w3c.dom.NodeList;   
 8   
 9 public class MyXMLReader2DOM {   
10 public static void main(String arge[]) {   
11   
12   long lasting = System.currentTimeMillis();   
13   
14   try {   
15     File f = new File("data_10k.xml");   
16     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();   
17     DocumentBuilder builder = factory.newDocumentBuilder();   
18     Document doc = builder.parse(f);   
19     NodeList nl = doc.getElementsByTagName_r("VALUE");   
20    for (int i = 0; i < nl.getLength(); i++) {   
21      System.out.print("车牌号码:"+ doc.getElementsByTagName_r("NO").item(i).getFirstChild().getNodeValue());   
22      System.out.println("车主地址:"+ doc.getElementsByTagName_r("ADDR").item(i).getFirstChild().getNodeValue());   
23     }   
24    } catch (Exception e) {   
25     e.printStackTrace();   
26    }   
27 }   
28 }  

第二种，DOM4J实现方法

 1 import java.io.*;   
 2 import java.util.*;   
 3 import org.dom4j.*;   
 4 import org.dom4j.io.*;   
 5   
 6 public class MyXMLReader2DOM4J {   
 7 public static void main(String arge[]) {   
 8   long lasting = System.currentTimeMillis();   
 9   try {   
10     File f = new File("data_10k.xml");   
11     SAXReader reader = new SAXReader();   
12     Document doc = reader.read(f);   
13     Element root = doc.getRootElement();   
14     Element foo;   
15    for (Iterator i = root.elementIterator("VALUE"); i.hasNext();) {   
16      foo = (Element) i.next();   
17      System.out.print("车牌号码:" + foo.elementText("NO"));   
18      System.out.println("车主地址:" + foo.elementText("ADDR"));   
19     }   
20    } catch (Exception e) {   
21     e.printStackTrace();   
22    }   
23 }   
24 }  

第三种 JDOM实现方法：

 1 import java.io.*;   
 2 import java.util.*;   
 3 import org.jdom.*;   
 4 import org.jdom.input.*;   
 5   
 6 public class MyXMLReader2JDOM {   
 7 public static void main(String arge[]) {   
 8   long lasting = System.currentTimeMillis();   
 9   try {   
10     SAXBuilder builder = new SAXBuilder();   
11     Document doc = builder.build(new File("data_10k.xml"));   
12     Element foo = doc.getRootElement();   
13     List allChildren = foo.getChildren();   
14    for (int i = 0; i < allChildren.size(); i++) {   
15      System.out.print("车牌号码:"+ ((Element) allChildren.get(i)).getChild("NO").getText());   
16      System.out.println("车主地址:"+ ((Element) allChildren.get(i)).getChild("ADDR").getText());   
17     }   
18    } catch (Exception e) {   
19     e.printStackTrace();   
20    }   
21 }   
22 }

第四种SAX实现方法：

 1 import javax.xml.parsers.SAXParser;   
 2 import javax.xml.parsers.SAXParserFactory;   
 3   
 4 import org.xml.sax.Attributes;   
 5 import org.xml.sax.InputSource;   
 6 import org.xml.sax.SAXException;   
 7 import org.xml.sax.helpers.DefaultHandler;   
 8   
 9 public class MyXMLReader2SAX extends DefaultHandler {   
10   
11 java.util.Stack tags = new java.util.Stack();   
12   
13 public MyXMLReader2SAX() {   
14   super();   
15 }   
16   
17 public static void main(String args[]) {   
18   long lasting = System.currentTimeMillis();   
19   try {   
20     SAXParserFactory sf = SAXParserFactory.newInstance();   
21     SAXParser sp = sf.newSAXParser();   
22     MyXMLReader2SAX reader = new MyXMLReader2SAX();   
23     sp.parse(new InputSource("data_10k.xml"), reader);   
24    } catch (Exception e) {   
25     e.printStackTrace();   
26    }   
27   
28    System.out.println("运行时间：" + (System.currentTimeMillis() - lasting)   
29      + "毫秒");   
30 }   
31   
32 public void characters(char ch[], int start, int length)   
33    throws SAXException {   
34    String tag = (String) tags.peek();   
35   if (tag.equals("NO")) {   
36     System.out.print("车牌号码：" + new String(ch, start, length));   
37    }   
38   if (tag.equals("ADDR")) {   
39     System.out.println("地址:" + new String(ch, start, length));   
40    }   
41 }   
42   
43 public void startElement(String uri, String localName, String qName,   
44     Attributes attrs) {   
45    tags.push(qName);   
46 }   
47 }