Tutorials : Java to XML and Back Again with Castor XML :

Adding Collection to the POJO

	
private List myList = new ArrayList();

public void setMyList(List myList) {
	this.myList = myList;
}

public List getMyList() {
	return this.myList;
}

public Person(String name, String email, String phone, List myList) {
	this.name = name;
	this.email = email;
	this.phone = phone;
	this.myList = myList;
}

	
<?xml version="1.0" encoding="UTF-8"?>
<mapping>
	<class name="us.prokhorenko.jx.Person">
		<map-to xml="person"/>

		<field name="email" type="string">
			<bind-xml name="email" node="element"/>
		</field>

		<field name="phone" type="string">
			<bind-xml name="phone" node="element"/>
		</field>

		<field name="name" type="string">
			<bind-xml name="name" node="element"/>
		</field>

		<field name="myList" type="java.util.List" 
		collection="arraylist">
			<bind-xml name="myList" node="element"/>
		</field>
	</class>
</mapping>

After the class has got Collection and you've got a mapping for it, you need to apply the mapping. First, modify the test application where it marshals the class to XML (the modifications are marked in bold):

// Marshalling class to XML

List myList = new ArrayList();
l.add("List#1");
l.add("List#2");

// Create the Person class
Person person = new Person("Mr. White", "mr@white", "626-555-1234", myList);

// We have a mapping, apply it
Mapping mapping = new Mapping();
mapping.loadMapping("mapping.xml");

// Marshal and save to XML file
FileWriter file = new FileWriter("person.xml");
Marshaller m = new Marshaller(file);
m.setMapping(mapping);
m.marshal(person);
file.close();

// Unmarshalling XML to class

// Read from XML and unmarshal
FileReader uFile = new FileReader("person.xml");
Unmarshaller u = new Unmarshaller(mapping);
Person uPerson = (Person)u.unmarshal(uFile);

// Show name and email
System.out.println("name: " + uPerson.getName());
System.out.println("email: " + uPerson.getEmail());

List myList = new ArrayList();
myList = uPerson.getMyList();

System.out.println("myList[0]: " + (String)myList.get(0));

<?xml version="1.0" encoding="UTF-8"?>
<person>
	<myList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	 xsi:type="java:java.util.String">
			List#1
	</myList>
	<myList xsi:type="java:java.util.String">
			List#2
	</myList>
	<email>prokhorenko@gmail.com</email>
	<name>Olexandr Prokhorenko</name>
	<phone>123-555-1234</phone>
</person>

How to Add Java Applets to Your Site

New on the Java Boutique:

New Review:

Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling API boasts simplicity, ease-of-integration, a well-rounded feature set, and it's free!

New Applet:

Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA sequences into three useful formats.

Elsewhere on internet.com:

WebDeveloper Java
Lots of Java information on webdeveloper.com

WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.

ScriptSearch Java
Hundreds of free Java code files to download.

jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.