Java读取xml文件的四种方法

xml文件：

<?xml version="1.0" encoding="GB2312"?> <RESULT> <VALUE> <NO>HC1234</NO> <ADDR>湖南省长沙市</ADDR> </VALUE> <VALUE> <NO>HCN1234</NO> <ADDR>湖南省长沙市宁乡县</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("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：

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：

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：

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); } }