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![run the following command:
$xjc course-booking.xsd -p org.wso2.jaxb.training -d src/generated
● -d <dir>: Place the generated files into this directory.
● -p <package>: Place the generated files in this package.
● -nv: Don't perform strict validation of the input schema.
● -httpproxy <proxy>: Use this if you are behind a proxy. Takes the format [user[:password]@]proxyHost[:proxyPort].
● -classpath <arg>: Specify the classpath, if necessary.
● -readOnly: Generates read-only source code files, if your OS supports this.
There is also an equivalent ant task, which makes it quite easy to integrate into an Ant or Maven-based build process.](https://image.slidesharecdn.com/xmlparsingusingjaxbslides-151013065346-lva1-app6892/75/XML-parsing-using-jaxb-11-2048.jpg)
Uploaded byMalintha Adikari
XML parsing using jaxb
JAXB (Java Architecture for XML Binding) defines an API for reading and writing Java objects to and from XML documents. It uses annotations to map XML elements and attributes to Java objects. This allows Java objects to be automatically marshalled to XML and XML to be unmarshalled to Java objects without needing to understand XML parsing techniques. JAXB comes bundled with the JDK so there are no extra dependencies. It provides a simpler model than DOM or SAX for working with XML in Java applications.
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XML parsing using jaxb
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- 3. ● Object (DOM,JDOM….etc) ● PUSH (SAX) ● PULL(Stax) ● JAXB(Java Architecture for XML Binding)
- 4. ● Defines anAPI for reading and writing Java objects to and from XML documents. ● Don't need to be aware of XML parsing techniques ● No extra dependency needed (its inside JDK) ● Used as a standard in many cases XML JAXB Java Objects
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- 8. JAXB uses annotationsto indicate the central elements. Annotation Definition @XmlRootElement(namespace = "namespace") Define the root element for an XML tree @XmlType(propOrder = { "field2", "field1",.. }) Allows to define the order in which the fields are written in the XML file @XmlElement Define the XML element which will be used. @XmlAttribute Define the attribute of an element
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- 10. XML : <?xml version="1.0"encoding="UTF-8"?> <booking xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance"> <company name="ACME Consulting"> <address>10 Coyote Avenue, Arizona, USA</address> <contact name="Duke" email="[email protected]" telephone="1234567890"/> </company> <student firstName="Jane" surname="Dow"/> <student firstName="John" surname="Doe"/> </booking> XSD : <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="booking" type="courseBooking"/> <xsd:complexType name="courseBooking"> <xsd:sequence> <xsd:element ref="company" /> <xsd:element ref="student" minOccurs="1" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attribute name="courseReference" type="xsd:string" use="required"/> <xsd:attribute name="courseDate" type="xsd:date" use="required"/> <xsd:attribute name="invoiceReference" type="xsd:string" use="required"/> <xsd:attribute name="totalPrice" type="xsd:decimal" use="required"/> </xsd:complexType> <xsd:element name="student" type="studentType"/> <xsd:complexType name="studentType"> <xsd:attribute name="firstName" type="xsd:string" use="required"/> <xsd:attribute name="surname" type="xsd:string" use="required"/> </xsd:complexType> <xsd:element name="company" type="companyType"/> <xsd:complexType name="companyType"> <xsd:sequence> <xsd:element name="address"/> <xsd:element ref="contact" /> </xsd:sequence> <xsd:attribute name="name" type="xsd:string"/> </xsd:complexType> <xsd:element name="contact" type="contactType"/> <xsd:complexType name="contactType"> <xsd:attribute name="name" type="xsd:string" use="required"/> <xsd:attribute name="telephone" type="xsd:string" use="required"/> <xsd:attribute name="email" type="xsd:string" use="required"/> </xsd:complexType> </xsd:schema>
- 11. run the followingcommand: $xjc course-booking.xsd -p org.wso2.jaxb.training -d src/generated ● -d <dir>: Place the generated files into this directory. ● -p <package>: Place the generated files in this package. ● -nv: Don't perform strict validation of the input schema. ● -httpproxy <proxy>: Use this if you are behind a proxy. Takes the format [user[:password]@]proxyHost[:proxyPort]. ● -classpath <arg>: Specify the classpath, if necessary. ● -readOnly: Generates read-only source code files, if your OS supports this. There is also an equivalent ant task, which makes it quite easy to integrate into an Ant or Maven-based build process.
- 18. @XmlAttribute For complete referenceplease visit : https://jaxb.java.net/tutorial/section_6_2_1-A-Survey-Of- JAXB-Annotations.html#A%20Survey%20Of%20JAXB%20Annotations
- 19. JAXB advantages o Itis very simple to use than DOM or SAX parser o We can marshal XML file to other data targets like inputStream,URL,DOM node. o We can unmarshal XML file from other data targets. o We don't need to be aware of XML parsing techniques. o We don't need to access XML in tree structure always. JAXB disadvantages o JAXB is high layer API so it has less control on parsing than SAX or DOM. o It has some overhead tasks so it is slower than SAX.
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- 21. ❖ https://jaxb.java.net/tutorial/ ❖ http://www.mkyong.com/java/jaxb-hello-world-example/ ❖http://javapostsforlearning.blogspot.com/2013/02/jaxb-tutorial.html
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