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 }