1. Exporting and Importing Data
XML
Exporting and Importing Data
Databases
Frameworks
SoftUni Team
Technical Trainers
Software University
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2. Table of Content XML Export XML Import
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3. Questions
sli.do #Hibernate

4. XML

5. XML Specifics XML = eXtensible Mark-up Language
XML is a lightweight format that is used for data interchanging
XML is easy to read and write
XML is language independent
XML format is primarily used to transmit data between a server and web application
The filename extension is .xml

6. XML Example person.xml Person Person Name
<?xml version="1.0" encoding="UTF-8">
<person>
<firstName>Teodor</firstName>
</person>
Person Name

7. XML Function Client Server person .js person.xml car. js car.xml
JavaScript
Java, PHP, C#
Client
Server
XML
PersonController.java
person .js
person.xml
CarController.java
car. js
car.xml

8. XML Structure XML documents are formed as element trees.
An XML tree starts at a root element and branches from the root to child elements.
All elements can have sub elements (child elements):
person.xml
Root
<?xml version="1.0" encoding="UTF-8">
<person>
<firstName>Teodor</firstName>
<address>
<country>Bulgaria</country>
<city>Stara Zagora</city>
</address>
</person>
Prolog
Tag
XML Element
Child
Closing Tag

9. XML Prolog (Optional) person.xml Prolog
<?xml version="1.0" encoding="UTF-8">

10. XML Root person.xml Root <?xml version="1.0" encoding="UTF-8">

11. XML Element person.xml Element
<?xml version="1.0" encoding="UTF-8">
<person>
<firstName>Teodor</firstName>
</person>
Element

12. XML Attribute person.xml Attribute
<?xml version="1.0" encoding="UTF-8">
<person firstName ="Teodor">
</person>
Attribute

13. XML Child person.xml Child <?xml version="1.0" encoding="UTF-8">
<address>
<country>Bulgaria</country>
<city>Stara Zagora</city>
</address>
</person>
Child

14. XML Structure person.xml Wrapper
<?xml version="1.0" encoding="UTF-8">
<person>
<phoneNumbers>
<phoneNumber>
<number> </number>
</phoneNumber>
<number> </number>
</phoneNumbers>
</person>
Wrapper

15. XML Structure person.xml Prolog Root Element Child Element Element
<?xml version="1.0" encoding="UTF-8">
<person>
<firstName>Teodor</firstName>
<address>
<country>Bulgaria</country>
<city>Stara Zagora</city>
</address>
<phoneNumbers>
<phoneNumber>
<number> </number>
</phoneNumber>
<number> </number>
</phoneNumbers>
</person>
Element
Child
Element
Element
Child
Wrapper
Element
Child
Element

16. JAXB
Provide easy to use mechanisms to convert XML to JSON and vice-versa
Generate compact and readability XML output
pom.xml
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</dependency>

17. JAXB Initialization
JAXBContext objects are responsible for the XML manipulations
JAXBContext.newInstance(object.getClass()) creates an instance of JAXBContext
object.getClass is the class that we will export/import
XMLParser.java
this.jaxbContext = JAXBContext.newInstance(object.getClass());

18. JAXB Annotations
@XmlRootElement – Root of the XML. It will be the beginning tag.
@XmlAccessorType(XmlAccessType.FIELD) – put your annotations on fields only
@XmlAttribute – makrs the field as an attribute
@XmlElement – makrs the field as an element
@XmlElementWrapper(name = “numbers") – wraps the array of phone numbers with tag “numbers”
@XmlTransient – the field won’t be exported/imported

19. Export Single Object to XML
AddressDto.java
@XmlRootElement(name = "address")
@XmlAccessorType(XmlAccessType.FIELD)
public class AddressJsonDto implements Serializable {
@XmlAttribute(name = "country")
private String country;
@XmlElement(name = "city")
private String city; }
XMLParser.java
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
OutputStream outputStream = new FileOutputStream(fileName);
BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(outputStream));
jaxbMarshaller.marshal(object, bfw);
Creates XML

20. Export Single Object to XML
AddressDto.java
@XmlRootElement(name = "address")
@XmlAccessorType(XmlAccessType.FIELD)
public class AddressJsonDto implements Serializable {
@XmlAttribute(name = "country")
private String country;
@XmlElement(name = "city")
private String city; }
address.xml
<?xml version="1.0" encoding="UTF-8"?>
<address country="Bulgaria">
<city>Sofia</city>
</address>

21. Export Multiple Object to XML
AddressesDto.java
@XmlRootElement(name = "addresses")
@XmlAccessorType(XmlAccessType.FIELD)
public class AddressesDto {
@XmlElement(name = "address")
private List<AddressJsonDto> addressJsonDtos; }
XMLParser.java
AddressesDto addressJsonDtos = new AddressesDto(); jaxbMarshaller.marshal(addressesDto, bfw);

22. Export Multiple Object to XML
XMLParser.java
AddressesDto addressJsonDtos = new AddressesDto(); jaxbMarshaller.marshal(addressesDto, bfw);
addresses.json
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<addresses>
<address country="Bulgaria">
<city>Sofia</city>
</address>
<address country="Spain">
<city>Barcelona</city>
</addresses>

23. Import Single Object from XML
AddressDto.java
@XmlRootElement(name = "address")
@XmlAccessorType(XmlAccessType.FIELD)
public class AddressJsonDto implements Serializable {
@XmlAttribute(name = "country")
private String country;
@XmlElement(name = "city")
private String city; }
XMLParser.java
JAXBContext jaxbContext = JAXBContext.newInstance(AddressDto.class);
InputStream inputStream = getClass().getResourceAsStream("/files/input/xml/address.xml");
BufferedReader bfr = new BufferedReader(new InputStreamReader(inputStream));
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
AddressDto addressDto = (AddressDto) unmarshaller.unmarshal(bfr);
Creates Object

24. Import Single Object from XML
AddressDto.java
address.xml
@XmlRootElement(name = "address")
@XmlAccessorType(XmlAccessType.FIELD)
public class AddressJsonDto implements Serializable {
@XmlAttribute(name = "country")
private String country;
@XmlElement(name = "city")
private String city; }
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<address country="Bulgaria">
<city>Sofia</city>
</address>

25. Import Multiple Object to XML
XMLParser.java
Object that holds objects
JAXBContext jaxbContext = JAXBContext.newInstance(AddressesDto.class);
InputStream inputStream = getClass().getResourceAsStream("/files/input/xml/addresses.xml");
BufferedReader bfr = new BufferedReader(new InputStreamReader(inputStream));
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
AddressesDto addressesDto = (AddressesDto) unmarshaller.unmarshal(bfr);
addresses.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<addresses>
<address country="Bulgaria">
<city>Sofia</city>
</address>
<address country="Spain">
<city>Barcelona</city>
</addresses>

26. Summary
XML Export
XML Import

27. JDBC https://softuni.bg/courses/
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28. SoftUni Diamond Partners

29. License
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Attribution: this work may contain portions from
"Databases" course by Telerik Academy under CC-BY-NC-SA license
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