Question

I have issue about convert XML to Java Object , in here i use JAXB.
in my case:

XML DATA :

<persons>
  <person>
     <name>Aris Tonar</name>
     <age />
     <nickname />
     <saldo />
  </person>
</persons>

JAVA CLASS OF XML DATA :

public class Person{
   private String name;
   private Integer age;
   private String nickName;
   private Integer id;
   private Double saldo;

   /**
   *Setter and Getter
   */

}

and when i using standard JAXBContext Unmarshaller code for parse it to Java Object. with code :

JAXBContext context = JAXBContext.newInstance(Person.class.getPackage().getName());
Unmarshaller unmarshaller = context.createUnmarshaller();
JAXBElement element = (JAXBElement) unmarshaller.unmarshal(new StreamSource(new StringReader(stringOfXmlData.toString())));
Person obj = (Person) element.getValue();

it will give result :
Person name = “Aris Tonar”
Person age = null
Person nickname = “”
Person id = null
Person saldo = null

but not that result what i want, i want JAXB will give result :

Person name = “Aris Tonar”
Person age = 0
Person nickname = “”
Person id = null
Person saldo = 0

1. i want every element which declared in XML DATA will : if it’s value specified jaxb will interpreting it as normal(like name element) but if it’s value not specified jaxb will interpreting it as default value(like age,nickname, saldo elements)
2. and if element not declared in XML Data, so jaxb will interpreting it as null.(like id element)

whether possible i do it? may be with customizing JAXBContext Code ??

Answer 1

@XmlType(name = "person", propOrder = {"name", "age", "nickName" , "saldo"})
public class Person {

private String name;
private Integer age;
private String nickName;
private Integer id;
private Double saldo;

public Person(String name, Integer age, String nickName, Integer id, Double saldo) {
  this.name = name;
  this.age = age;
  this.nickName = nickName;
  this.id = id;
  this.saldo = saldo;
}

public Person() {
  //jaxb constructor
}

@XmlElement(defaultValue="0")
public Integer getAge() {
  return age;
}

@XmlTransient
public Integer getId() {
  return id;
}

@XmlElement(defaultValue="")
public String getName() {
  return name;
}

@XmlElement(name="nickname" , defaultValue="")
public String getNickName() {
 return nickName;
}

@XmlElement(defaultValue="0")
public Double getSaldo() {
  return saldo;
}

public void setAge(Integer age) {
  this.age = age;
}

public void setId(Integer id) {
  this.id = id;
}

public void setName(String name) {
  this.name = name;
}

public void setNickName(String nickName) {
  this.nickName = nickName;
}

public void setSaldo(Double saldo) {
  this.saldo = saldo;
}


}