First Of All Make Sure Your Machine Is Setup With Java Development Environment.
In This Lesson Will Do Following Tasks.
1. Creating A Simple XML File
2. Generating XSD File For XML File
3. Running JAXB Compiler To Genarate Java Classes
4. Unmarshal(XML To Objects) & Marshaling(Objects To XML)
5. Running The Project
Before Starting Make Sure You Have Downloaded The "jaxb-api-2.1" & Setup The ClassPath For That.If Everything Done Lets Do Begin The Work.
1. Creating A Simple XML File
First Create A XML File As You Want, But Make It With Many Results.
I'm Going To Use XML Related To Library.
Library.xml
<?xml version="1.0"?>
<Library>
<Book>
<Title>My Life and Times</Title>
<Author>Paul McCartney</Author>
<Date>1998</Date>
<ISBN>1-56592-235-2</ISBN>
<Publisher>McMillin Publishing</Publisher>
</Book>
<Book>
<Title>Illusions The Adventures of a Reluctant Messiah</Title>
<Author>Richard Bach</Author>
<Date>1977</Date>
<ISBN>0-440-34319-4</ISBN>
<Publisher>Dell Publishing Co.</Publisher>
</Book>
<Book>
<Title>The First and Last Freedom</Title>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher>
</Book>
</Library>
2. Generating XSD File For XML File
Now We Need To Get The XSD File For This XML.Rather Going For A Coding To Do This, Simply Google It "XML To XSD". You Will Find Many XML To XSD Converters Online.
I Have Used One Of Them & Converted My Library.xml To Library.xsd
Library.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="Library">
<xs:complexType>
<xs:sequence>
<xs:element name="Book" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="Title" type="xs:string"></xs:element>
<xs:element name="Author" type="xs:string"></xs:element>
<xs:element name="Date" type="xs:int"></xs:element>
<xs:element name="ISBN" type="xs:string"></xs:element>
<xs:element name="Publisher" type="xs:string"></xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
3. Running JAXB Compiler To Genarate Java Classes
First Create A Folder Inside Your Project Folder And Name It As JAXB.
Open A Command Prompt And Go To The Relevant Folder Using.
To Generate Java Classes For This XML File Run The Following Command In Command Prompt.
xjc -d JAXB Library.xsd
After Run This You Will Get The Java Classes Inside The Folder JAXB.
Following Are The Classes Which I Got.
Library.java
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"book"
})
@XmlRootElement(name = "Library")
public class Library {
@XmlElement(name = "Book", required = true)
protected List<Library.Book> book;
public List<Library.Book> getBook() {
if (book == null) {
book = new ArrayList<Library.Book>();
}
return this.book;
}
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"title",
"author",
"date",
"isbn",
"publisher"
})
public static class Book {
@XmlElement(name = "Title", required = true)
protected String title;
@XmlElement(name = "Author", required = true)
protected String author;
@XmlElement(name = "Date")
protected int date;
@XmlElement(name = "ISBN", required = true)
protected String isbn;
@XmlElement(name = "Publisher", required = true)
protected String publisher;
public String getTitle() {
return title;
}
public void setTitle(String value) {
this.title = value;
}
public String getAuthor() {
return author;
}
public void setAuthor(String value) {
this.author = value;
}
public int getDate() {
return date;
}
public void setDate(int value) {
this.date = value;
}
public String getISBN() {
return isbn;
}
public void setISBN(String value) {
this.isbn = value;
}
public String getPublisher() {
return publisher;
}
public void setPublisher(String value) {
this.publisher = value;
}
}
}
ObjectFactory.java
import javax.xml.bind.annotation.XmlRegistry;
@XmlRegistry
public class ObjectFactory {
public ObjectFactory() {
}
public Library createLibrary() {
return new Library();
}
public Library.Book createLibraryBook() {
return new Library.Book();
}
}
Create Following Java Class Inside The JAXB FolderTo Do The Un-Marshaling and Marshaling.
Main.java
import java.io.File;
import java.io.FileReader;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
class Main {
public static void main(String args[]){
try{
//Creating The Context
JAXBContext jaxbcontext = JAXBContext.newInstance(Library.class);
Unmarshaller unmarshaller = jaxbcontext.createUnmarshaller();
//Unmarshaling Library XML File
Library library = (Library)unmarshaller.unmarshal(new FileReader("Library.xml"));
List<Library.Book> booklist = library.getBook();
//Printing Library Book Details
System.out.println("\nUnMarshalling :: Current XML File\n\n");
System.out.println("\n~~ Libraray Book Details ~~\n");
System.out.println("____________________________________________________");
int iBookCount = 1;
for (Library.Book book : booklist) {
System.out.println("Book No :" + iBookCount++);
System.out.println("Title: " + book.getTitle());
System.out.println("Author: " + book.getAuthor());
System.out.println("Date: " + book.getDate());
System.out.println("ISBN: " + book.getISBN());
System.out.println("Publisher: " + book.getPublisher());
System.out.println("____________________________________________________");
}
//Adding A New Book To The Library
Library.Book newBook1 = new Library.Book();
newBook1.setTitle("Learning Java in 21 Days");
newBook1.setAuthor("Sam De Costa");
newBook1.setDate(2012);
newBook1.setISBN("978-0060554736");
newBook1.setPublisher("Sun Micro Systems");
booklist.add(newBook1);
//Adding A New Book To The Library
Library.Book newBook2 = new Library.Book();
newBook2.setTitle("How Te Be A Good Programmer");
newBook2.setAuthor("Nifal Nizar");
newBook2.setDate(2014);
newBook2.setISBN("1245-0060-5547");
newBook2.setPublisher("ADVANCE PUBLISHERS");
booklist.add(newBook2);
//Printing New Library Book Details
System.out.println("\n~~ New Libraray Book Details ~~\n");
System.out.println("____________________________________________________");
iBookCount = 1;
for (Library.Book book : booklist) {
System.out.println("Book No :" + iBookCount++);
System.out.println("Title: " + book.getTitle());
System.out.println("Author: " + book.getAuthor());
System.out.println("Date: " + book.getDate());
System.out.println("ISBN: " + book.getISBN());
System.out.println("Publisher: " + book.getPublisher());
System.out.println("____________________________________________________");
}
//Creating Library Object To Write To The XML File
ObjectFactory objectfactory = new ObjectFactory();
Library mylibrary = objectfactory.createLibrary();
for (Library.Book book : booklist) {
mylibrary.getBook().add(book);
}
//Marshalling
Marshaller marshaller = jaxbcontext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(mylibrary, new File("Library.xml"));
//Printing New XML File
System.out.println("\n\nMarshaling Done");
System.out.println("This Is The Newest xml File\n");
marshaller.marshal(mylibrary, System.out);
}
catch(Exception e){
System.out.println(e.toString());
}
}
}
5. Running The Project
Go To Folder JAXB In The Command Prompt.
Compile All The Classes Using Command *.java
Run The Project Using Command java Main
You Will Get The Output.
Enjoy Coding...
Run The Project Using Command java Main
You Will Get The Output.
Enjoy Coding...
