JDOM is simply a Java representation of an XML document. It provides a way to represent that document for efficient parsing, manipulation, and writing. It has a straightforward API, which is optimized for the Java programmer. It's an alternative to DOM and SAX, although it integrates well with both DOM and SAX. It also integrates with other xml parsers like xerces.
The following class has methods for creating and parsing an xml document using JDom.
XMLJDomParser.java
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
public class XMLJDomParser
{
public static void main(String[] args)
{
XMLJDomParser xmlJDomParser = new XMLJDomParser();
String fileName = "Devices.xml";
// first create a xml document and pass the xml string to create an xml file
xmlJDomParser.createFile(xmlJDomParser.createDocument(), fileName);
// parse the same document
xmlJDomParser.parseDoc(fileName);
}
/*
* This method parses each element in the xml document and prints the text content.
*/
public void parseDoc(String fileName)
{
Document doc = null;
InputStream input = null;
SAXBuilder saxBuilder = null;
try
{
input = new FileInputStream(fileName);
saxBuilder = new SAXBuilder(false);
doc = saxBuilder.build(input);
Element root = doc.getRootElement();
parseElement(root);
}
catch (Exception e)
{
}
}
private void parseElement(Element root)
{
List<Element> lstElements = root.getChildren();
for (Element elem : lstElements)
{
if (elem.getChildren().size() > 0)
{
parseElement(elem);
return;
}
else
System.out.println(elem.getText());
}
}
/*
* This method creates an xml file using the xmlstirng and file name as arguments.
*/
public void createFile(String fileContents, String fileName)
{
File file = new File(fileName);
FileOutputStream fOut = null;
try
{
fOut = new FileOutputStream(file);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
BufferedOutputStream bf = new BufferedOutputStream(fOut);
try
{
bf.write(fileContents.getBytes());
bf.flush();
}
catch (IOException e)
{
e.printStackTrace();
}
}
/*
* This method creates a xml document using jdom.
*/
public String createDocument()
{
String xmlDoc = null;
try
{
Document doc = new Document(new Element("Devices"));
Element device = new Element("Device");
Element deviceId = new Element("deviceId").setText("1001");
Element deviceName = new Element("deviceName").setText("Cables Connectors");
Element productId = new Element("productId").setText("CC1084");
Element serialNo = new Element("serialNo").setText("038123-45627");
doc.getRootElement().addContent(device);
device.addContent(deviceId);
device.addContent(deviceName);
device.addContent(productId);
device.addContent(serialNo);
XMLOutputter domstream = new XMLOutputter();
domstream.output(doc, System.out);
xmlDoc = domstream.outputString(doc);
}
catch (Exception e)
{
e.printStackTrace();
}
return xmlDoc;
}
}