JAXB XML to Java

JAXB also supports generating of schema from the Java code. schemagen tool helps in this. Let's write a SimpleUser and SimpleAddress class with annotation and than we can generate the schema for it.

SimpleUser.java

@XmlRootElement(name="simpleUser")

public class SimpleUser {    

    protected List<SimpleAddress> addressList = new ArrayList<SimpleAddress>();

    protected String comment;

    protected int age;    

    @XmlElementWrapper(name="addresses")

    @XmlElement(name="address")

    public List<SimpleAddress> getAddressList() {

    return addressList;

    }

   ....

SimpleAddress.java

@XmlAccessorType(XmlAccessType.FIELD)

@XmlType(name = "address",

     propOrder = {"houseNo", "society", "locality", "city", "pin","phone"})

public class SimpleAddress {    

   @XmlElement

   protected String houseNo;

   @XmlElement

   protected String society;

   @XmlElement

   protected String locality;

   @XmlElement

   protected String city;

   @XmlElement

   protected int pin;

   @XmlTransient

   protected String country;

Run the schmeagen tool on the above java classes

schemagen.sh -d .  //place where generated schema is kept

            -cp ../bin/   //classpath

             com.lalit.jaxb.SimpleUser       //list of java files          

             com.lalit.jaxb.SimpleAddress

The generates schema looks like

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="simpleUser" type="simpleUser"/>

  <xs:complexType name="simpleUser">

    <xs:sequence>

      <xs:element name="addresses" minOccurs="0">

        <xs:complexType>

          <xs:sequence>

            <xs:element name="address" type="address" minOccurs="0" maxOccurs="unbounded"/>

          </xs:sequence>

        </xs:complexType>

      </xs:element>

      <xs:element name="comment" type="xs:string" minOccurs="0"/>

    </xs:sequence>

    <xs:attribute name="age" type="xs:int" use="required"/>

  </xs:complexType>

  <xs:complexType name="address">

    <xs:sequence>

      <xs:element name="houseNo" type="xs:string" minOccurs="0"/>

      <xs:element name="society" type="xs:string" minOccurs="0"/>

      <xs:element name="locality" type="xs:string" minOccurs="0"/>

      <xs:element name="city" type="xs:string" minOccurs="0"/>

      <xs:element name="pin" type="xs:int"/>

      <xs:element name="phone" type="xs:string" minOccurs="0"/>

    </xs:sequence>

  </xs:complexType>

</xs:schema>

More on JAXB