Developing XML Applications with WebLogic Server 3-7
3.3.1 Generating XML from a DOM Document Tree
You can use the javax.xml.transform.Transformer class to serialize a DOM object into an XML stream, as shown in the following example segment:
import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document; import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.; ...
TransformerFactory trans_factory = TransformerFactory.newInstance; Transformer xml_out = trans_factory.newTransformer;
Properties props = new Properties; props.putmethod, xml;
xml_out.setOutputPropertiesprops; xml_out.transformnew DOMSourcedoc, new StreamResultSystem.out;
In the example, the Transformer.transform method does the work of converting a DOM object into an XML stream. The transform method takes as
input a javax.xml.transform.dom.DOMSource object, created from the DOM tree stored in the doc variable, and converts it into a
javax.xml.transform.stream.StreamResult object and writes the resulting XML document to the standard output.
3.3.2 Generating XML Documents in a JSP
You typically use JSPs to generate HTML, but you can also use a JSP to generate an XML document.
Using JSPs to generate XML requires that you set the content type of the JSP page as follows:
page contentType=textxml ... XML document
The following code shows an example of how to use JSP to generate an XML document:
?xml version=1.0 page contentType=textxml import=java.text.DateFormat,java.util.Date
message text
Hello World. text
Note: For detailed instructions on using the Streaming API for XML
StAX to generate XML documents, see Chapter 4, Using the
Streaming API for XML StAX.
3-8 Programming XML for Oracle WebLogic Server
timestamp out.printDateFormat.getDateInstance.formatnew Date;
timestamp message
For more information about using JSP to generate XML, see http:java.sun.comproductsjsphtmlJSPXML.html
.
3.4 Transforming XML Documents
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