java读取xml数据方法
xml文件:
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 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);
}
}
Java代码
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()); System.out.println("运行时间:" + (System.currentTimeMillis() - lasting) + "毫秒"); } } } catch (Exception e) { e.printStackTrace(); } } } |
第二种,DOM4J实现方法:
Java代码
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")); } System.out.println("运行时间:" + (System.currentTimeMillis() - lasting) + "毫秒"); } } catch (Exception e) { e.printStackTrace(); } } } |
第三种 JDOM实现方法:
Java代码
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()); } System.out.println("运行时间:" + (System.currentTimeMillis() - lasting) + "毫秒"); } } catch (Exception e) { e.printStackTrace(); } } } |
第四种SAX实现方法:
Java代码
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);
}
}