What is JAXP? How to Read and Write XML Document Using JAXP

The Java API for XML Processing (JAXP) is for processing XML data using applications written in the Java programming language. JAXP leverages the parser standards Simple API for XML Parsing (SAX) and Document Object Model (DOM) so that you can choose to parse your data as a stream of events or to build an object representation of it. JAXP also supports the Extensible Stylesheet Language Transformations (XSLT) standard, giving you control over the presentation of the data and enabling you to convert the data to other XML documents or to other formats, such as HTML. JAXP also provides namespace support, allowing you to work with DTDs that might otherwise have naming conflicts. Finally, as of version 1.4, JAXP implements the Streaming API for XML (StAX) standard.

Designed to be flexible, JAXP allows you to use any XML-compliant parser from within your application. It does this with what is called a pluggability layer, which lets you plug in an implementation of the SAX or DOM API. The pluggability layer also allows you to plug in an XSL processor, letting you control how your XML data is displayed.


Read and Write XML document using JAXP

import javax.xml.parsers.*; // JAXP import javax.xml.transform.*; // JAXP import javax.xml.transform.dom.DOMSource; // JAXP import javax.xml.transform.stream.StreamResult; // JAXP import org.xml.sax.SAXException; import org.w3c.dom.Document; import java.io.IOException;   public class RestructureDriver {    public static void main(String[] args) {           if (args.length <= 0) {       System.out.println("Usage: java RestructureDriver URL");       return;     }     String url = args[0];          try {       // Find a parser       DocumentBuilderFactory factory         = DocumentBuilderFactory.newInstance();       factory.setNamespaceAware(true);       DocumentBuilder parser = factory.newDocumentBuilder();              // Read the document       Document document = parser.parse(url);              // Modify the document       Restructurer.processNode(document);              // Write it out again       TransformerFactory xformFactory         = TransformerFactory.newInstance();       Transformer idTransform = xformFactory.newTransformer();       Source input = new DOMSource(document);       Result output = new StreamResult(System.out);       idTransform.transform(input, output);            }     catch (SAXException e) {       System.out.println(url + " is not well-formed.");     }     catch (IOException e) {        System.out.println(        "Due to an IOException, the parser could not read " + url       );      }     catch (FactoryConfigurationError e) {        System.out.println("Could not locate a factory class");      }     catch (ParserConfigurationException e) {        System.out.println("Could not locate a JAXP parser");      }     catch (TransformerConfigurationException e) {        System.out.println("This DOM does not support transforms.");      }     catch (TransformerException e) {        System.out.println("Transform failed.");      }       }  }