Java读取xml文件的方法

2016-10-31 00:00:00嘉辉 SUN认证

  xml文件:

  Xml代码

  A1234

  XX省XX市

  B1234

  XX省XX市二七区

  第一种 DOM 实现方法:

  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);

  }

  }

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