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66 The XML Files: Development of XML/XSL Applications Using WebSphere Studio
Figure 3-5 JAXP architecture
As shown, application code does not deal directly with specific parser or
processor implementations. Instead, you write code against abstract classes that
JAXP provides. This level of indirection allows you to pick and choose among
different implementations without even recompiling your application.
Using JAXP
In this section, we show a very simple example that illustrates the usage of JAXP
to invoke the process of transforming an XML document, using an XSLT
stylesheet.
Example 3-6 Sample XML to HTML transformation code
File xml = new File("fileName.xml");
File xslt = new File("fileName.xsl");
File html = new File("fileName.html");
javax.xml.transform.Source xmlSource =
new javax.xml.transform.stream.StreamSource(xml);
javax.xml.transform.Source xsltSource =
new javax.xml.transform.stream.StreamSource(xslt);
javax.xml.transform.Result result =
new javax.xml.transform.stream.StreamResult(html);
//create an instance of TransformerFactory
javax.xml.transform.TransformerFactory transFact =
javax.xml.transform.TransformerFactory.newInstance();
javax.xml.transform.Transformer trans =
transFact.newTransformer(xsltSource);
trans.transform(xmlSource, result);
Application Code
DocumentBuilder
SAXParser
Transformer
XSLT Processor
Implementation
SAX Parser
Implementation
DOM API
Implementation
JAXP