In Java, there are several low-level APIs to process XML documents and XML Schemas , from common APIs (javax.xml.stream.XmlStreamWriter and java.beans.XMLEncoder) to more complex and low-level models such as Simple API for XML (SAX), Document Object Model (DOM), or Java API for XML Processing (JAXP). JAXB provides a higher level of abstraction than SAX or DOM and is based on annotations.
JAXB defines a standard to bind Java representations to XML and vice versa. It manages XML documents and XML Schema Definitions (XSD) in a transparent, object-oriented way that hides the complexity of the XSD language.
Except for the @XmlRootElement annotation, The following code shows the code of a normal Java class.
Except for the @XmlRootElement annotation, The following code shows the code of a normal Java class.
package test.jaxb;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author Saeed Zarinfam
*/
@XmlRootElement
public class CreditCard {
private String number;
private String expiryDate;
private Integer controlNumber;
private String type;
public CreditCard(String number, String expiryDate, Integer controlNumber, String type) {
this.number = number;
this.expiryDate = expiryDate;
this.controlNumber = controlNumber;
this.type = type;
}
public CreditCard() {
}
public Integer getControlNumber() {
return controlNumber;
}
public void setControlNumber(Integer controlNumber) {
this.controlNumber = controlNumber;
}
public String getExpiryDate() {
return expiryDate;
}
public void setExpiryDate(String expiryDate) {
this.expiryDate = expiryDate;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
}
As shown in the following code ,With this annotation and a marshalling mechanism, JAXB is able to create an XML repreentation of a CreditCard instance :
package test.jaxb;
import java.io.StringWriter;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
/**
*
* @author Saeed Zarinfam
*/
public class Main {
public static void main(String[] args) {
try {
CreditCard creditCard = new CreditCard("1234", "12/09", 6398, "Visa");
StringWriter writer = new StringWriter();
JAXBContext context = JAXBContext.newInstance(CreditCard.class);
Marshaller m = context.createMarshaller();
m.marshal(creditCard, writer);
System.out.println(writer.toString());
} catch (JAXBException ex) {
ex.printStackTrace();
}
}
}
Reference : Beginning Java™ EE 6 Platform with GlassFish™ 3 From Novice to Professional
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