Monday 13 August 2012

Java Training: - How will you explain marshaling and unmarshalling?

Marshaling: -

Marshalling creates an XML document from a content tree.

To marshal a content tree,
  • Create a JAXBContext object
  • Create a Marshaller object (Marshaller marshaller = jaxbContext.createMarshaller();)
  • Set required properties using setProperty method of Marshaller marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, new Boolean(true));
  • Call the marshal method marshaller.marshal(collection, new FileOutputStream("jaxbOutput.xml"));
Unmarshalling: -

Unmarshalling an XML document means creating a tree of content objects that represents the content and organization of the document.

To unmarshal an XML document,
  • Create a JAXBContext object(JAXBContext jaxbContext = JAXBContext.newInstance("package name ");
  • Create an Unmarshaller object Unmarshaller unmarshaller = jc.createUnmarshaller();
  • Call the unmarshal method unmarshaller.unmarshal(new File( "xml name"));
  • Use the get methods in the schema-derived classes to access the XML data
See the following video on Introduction to Hibernate and it concepts in Java: -

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