JAVA 분석 XML 의 네 가지 기술
1
XML
XML , XML。 Java
XML 。
XML , , , ,
。 XML , , DOM(Document Object
Model),DTD(Document Type Definition),SAX(Simple API for XML),XSD(Xml Schema Definition),XSLT(Extensible
Stylesheet Language Transformations), w3c http://www.w3.org 。
XML , 。 , SAX，
DOM。
SAX ,DOM XML 。
XML :
<?xml version="1.0" encoding="UTF-8"?>
<employees>
<employee>
<name>ddviplinux</name>
<sex>m</sex>
<age>30</age>
</employee>
</employees>
JAVA DOM SAX XML 。
XML XmlDocument XML 。
package com.alisoft.facepay.framework.bean;
/**
*
* @author hongliang.dinghl
* XML
*/
public interface XmlDocument {
/**
* XML
* @param fileName
*/
public void createXml(String fileName);
/**
* XML
* @param fileName
*/
public void parserXml(String fileName);
}
1.DOM XML XML 。
， ， DOM 。
： ， ； 、 、 ；
： （ ）， ；
：
； （ 、CPU）。
package com.alisoft.facepay.framework.bean;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
*
* @author hongliang.dinghl
* DOM XML
*/
public class DomDemo implements XmlDocument {
private Document document;
private String fileName;
public void init() {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
this.document = builder.newDocument();
}
catch (ParserConfigurationException e)
{
System.out.println(e.getMessage());
}
}
public void createXml(String fileName) {
Element root = this.document.createElement("employees");
this.document.appendChild(root);
Element employee = this.document.createElement("employee");
Element name = this.document.createElement("name");
name.appendChild(this.document.createTextNode(" "));
employee.appendChild(name);
Element sex = this.document.createElement("sex");
sex.appendChild(this.document.createTextNode("m"));
employee.appendChild(sex);
Element age = this.document.createElement("age");
age.appendChild(this.document.createTextNode("30"));
employee.appendChild(age);
root.appendChild(employee);
TransformerFactory tf = TransformerFactory.newInstance();
try {
Transformer transformer = tf.newTransformer();
DOMSource source = new DOMSource(document);
transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));
StreamResult result = new StreamResult(pw);
transformer.transform(source, result);
System.out.println(" XML !");
}
catch (TransformerConfigurationException e)
{
System.out.println(e.getMessage());
}
catch (IllegalArgumentException e)
{
System.out.println(e.getMessage());
}
catch (FileNotFoundException e)
{
System.out.println(e.getMessage());
}
catch (TransformerException e)
{
System.out.println(e.getMessage());
}
}
public void parserXml(String fileName)
{
try
{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse(fileName);
NodeList employees = document.getChildNodes();
for (int i = 0; i < employees.getLength(); i++)
{
Node employee = employees.item(i);
NodeList employeeInfo = employee.getChildNodes();
for (int j = 0; j < employeeInfo.getLength(); j++)
{
Node node = employeeInfo.item( j);
NodeList employeeMeta = node.getChildNodes();
for (int k = 0; k < employeeMeta.getLength(); k++)
{
System.out.println(employeeMeta.item(k).getNodeName()
+ ":" + employeeMeta.item(k).getTextContent());
}
}
}
System.out.println(" ");
}
catch (FileNotFoundException e)
{
System.out.println(e.getMessage());
}
catch (ParserConfigurationException e)
{
System.out.println(e.getMessage());
}
catch (SAXException e)
{
System.out.println(e.getMessage());
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
}
}
2.SAX XML DOM ， SAX。SAX ， 。
、 、 、 ， ， ， 。
： ， ；SAX DOM ， Applet， 。
： ； ， ， ； ； ，
package com.alisoft.facepay.framework.bean;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
*
* @author hongliang.dinghl
* SAX
*/
public class SaxDemo implements XmlDocument {
public void createXml(String fileName)
{
System.out.println("<<"+filename+">>");
}
public void parserXml(String fileName)
{
SAXParserFactory saxfac = SAXParserFactory.newInstance();
try {
SAXParser saxparser = saxfac.newSAXParser();
InputStream is = new FileInputStream(fileName);
saxparser.parse(is, new MySAXHandler());
}
catch (ParserConfigurationException e)
{
e.printStackTrace();
} c
atch (SAXException e)
{
e.printStackTrace();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
class MySAXHandler extends DefaultHandler {
boolean hasAttribute = false;
Attributes attributes = null;
public void startDocument() throws SAXException
{
System.out.println(" ");
}
public void endDocument() throws SAXException
{
System.out.println(" ");
}
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException
{
if (qName.equals("employees")) {
return;
}
if (qName.equals("employee")) {
System.out.println(qName);
}
if (attributes.getLength() > 0) {
this.attributes = attributes;
this.hasAttribute = true;
}
}
public void endElement(String uri, String localName, String qName)
throws SAXException
{
if (hasAttribute && (attributes != null)) {
for (int i = 0; i < attributes.getLength(); i++)
{
System.out.println(attributes.getQName(0) + attributes.getValue(0));
}
}
}
public void characters(char[] ch, int start, int length)
throws SAXException
{
System.out.println(new String(ch, start, length));
}
}
3.DOM4J XML
DOM4J Java XML API， 、 ，
。 Java DOM4J XML， Sun JAXM
DOM4J。
package com.alisoft.facepay.framework.bean;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
/**
*
* @author hongliang.dinghl
* Dom4j XML XML
*/
public class Dom4jDemo implements XmlDocument
{
public void createXml(String fileName)
{
Document document = DocumentHelper.createDocument();
Element employees=document.addElement("employees");
Element employee=employees.addElement("employee");
Element name= employee.addElement("name");
name.setText("ddvip");
Element sex=employee.addElement("sex");
sex.setText("m");
Element age=employee.addElement("age");
age.setText("29");
try
{
Writer fileWriter=new FileWriter(fileName);
XMLWriter xmlWriter=new XMLWriter(fileWriter);
xmlWriter.write(document);
xmlWriter.close();
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
}
public void parserXml(String fileName)
{
File inputXml=new File(fileName);
SAXReader saxReader = new SAXReader();
try
{
Document document = saxReader.read(inputXml);
Element employees=document.getRootElement();
for(Iterator i = employees.elementIterator(); i.hasNext();)
{
Element employee = (Element) i.next();
for(Iterator j = employee.elementIterator(); j.hasNext();)
{
Element node=(Element) j.next();
System.out.println(node.getName()+":"+node.getText());
}
}
}
catch (DocumentException e)
{
System.out.println(e.getMessage());
}
System.out.println("dom4j parserXml");
}
}
4.JDOM XML
DOM、SAX ， JDOM； ：20-80 ， 。 ： ，
、 ， ，JDOM SAX（ ）、DOM、Xanan 。
package com.alisoft.facepay.framework.bean;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
/**
*
* @author hongliang.dinghl
* JDOM XML
*
*/
public class JDomDemo implements XmlDocument {
public void createXml(String fileName)
{
Document document;
Element root;
root=new Element("employees");
document=new Document(root);
Element employee=new Element("employee");
root.addContent(employee);
Element name=new Element("name");
name.setText("ddvip");
employee.addContent(name);
Element sex=new Element("sex");
sex.setText("m");
employee.addContent(sex);
Element age=new Element("age");
age.setText("23");
employee.addContent(age);
XMLOutputter XMLOut = new XMLOutputter();
try
{
XMLOut.output(document, new FileOutputStream(fileName));
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void parserXml(String fileName)
{
SAXBuilder builder=new SAXBuilder(false);
try {
Document document=builder.build(fileName);
Element employees=document.getRootElement();
List employeeList=employees.getChildren("employee");
for(int i=0;i<employeeList.size();i++)
{
Element employee=(Element)employeeList.get(i);
List employeeInfo=employee.getChildren();
for(int j=0;j<employeeList.size();i++)
{
System.out.println(((Element)employeeInfo.get(j)).getName()+":"+((Element)employeeInfo.get(j)).getValue());
}
}
}
catch (JDOMException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
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