annotations - How can I add xml attributes to jaxb annotated class XmlElementWrapper?

Question

I have a class with a XmlElementWrapper annotation like:

...

  @XmlElementWrapper(name="myList")
    @XmlElements({
    @XmlElement(name="myElement") }
    )
    private List<SomeType> someList = new LinkedList();

... This code produces XML like

<myList>
  <myElement> </myElement>
  <myElement> </myElement>
  <myElement> </myElement>
</myList>

so far so good.

But now I need to add attributes to the list tag to get XML like

<myList number="2">
  <myElement> </myElement>
  <myElement> </myElement>
  <myElement> </myElement>
</myList>

Is there a 'smart way to achieve this without creating a new class that contains represents the list?

Answer 1

I got a better solution for your question.

For making Xml Java object, use the following code:

import java.util.*;
import javax.xml.bind.annotation.*;

@XmlRootElement(name="myList")
public class Root {

    private String number;
    private List<String> someList;

    @XmlAttribute(name="number")
    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    @XmlElement(name="myElement")
    public List<String> getSomeList() {
        return someList;
    }

    public void setSomeList(List<String> someList) {
        this.someList = someList;
    } 

    public Root(String numValue,List<String> someListValue) {
        this();
        this.number = numValue;
        this.someList = someListValue;  
    }

    /**
     * 
     */
    public Root() {
        // TODO Auto-generated constructor stub
    }

}

To run the above code using JAXB, use the following:

   import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.*;

public class Demo {

        public static void main(String[] args) throws Exception {
            List<String> arg = new ArrayList<String>();
            arg.add("FOO");
            arg.add("BAR");
            Root root = new Root("123", arg);

            JAXBContext jc = JAXBContext.newInstance(Root.class);
            Marshaller marshaller = jc.createMarshaller();
            marshaller.marshal(root, System.out);
        }
}

This will produce the following XML as the output:

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <myList number="123">
        <myElement>FOO</myElement>
        <myElement>BAR</myElement>
    </myList>

I think this is more helpful you.

Thanks..