CODEWITHSUNDEEP
javaxml
Parameswar
Parameswar

Reputation: 2069

represent xml as java classes

Probably this question might have been asked. I am new to the conversion of xml to java classes. I have an xml like this:

<Root>
    <Book name="harel" price="5" />
    <Book name="xml" price="9" />
</Root>

IS there a way to generate java classes dynamicaly for a structure like this ? A small correction, i don't have an xsd for the xml

Upvotes: 3

Views: 3404

Answers (5)

bdoughan
bdoughan

Reputation: 148977

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.

IS there a way to generate java classes dynamicaly for a structure like this ?

JAXB implementations provide the ability to generate a Java model from an XML schema. The reference implementation which is included in the JDK starting in Java SE 6 is available at:

<JAVA_HOME>/bin/xjc

An example of generating an object model from an XML schema can be found here:

A small correction, i don't have an xsd for the xml

If you don't have an XML schema you could find a utility to generate an XML schema from an XML document:

Or start from code.

STARTING FROM CODE

You can also start from code and annotate your model to map to the existing XML structure.

Root

package forum11213872;

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

@XmlRootElement(name="Root")
@XmlAccessorType(XmlAccessType.FIELD)
public class Root {

    @XmlElement(name="Book")
    private List<Book> books;

}

Book

package forum11213872;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Book {

    @XmlAttribute
    private String name;

    @XmlAttribute
    private int price;

}

Demo

package forum11213872;

import java.io.File;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Root.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("src/forum11213872/input.xml");
        Root root = (Root) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(root, System.out);
    }

}

input.xml/Output

<Root>
    <Book name="harel" price="5" />
    <Book name="xml" price="9" />
</Root>

Upvotes: 6

LINEMAN78
LINEMAN78

Reputation: 2562

Use JAXB, it is included in JavaSE now and you can use XJC to generate the classes from an XSD. However if you truly mean dynamically as in the structure of the XML isn't known till runtime you will need to use something like JDOM.

Upvotes: 1

Z&#233;ychin
Z&#233;ychin

Reputation: 4205

Have a look at XStream.

It converts between XML and Java and between Java and XML.

Upvotes: 1

franklins
franklins

Reputation: 3738

Try Java Castor. You can specify a xsd and convert it to object. There is also a plugin for Eclipse.

http://www.castor.org/

Upvotes: 2

mihaisimi
mihaisimi

Reputation: 1999

Yes, see the castor framework (http://www.castor.org/) or jaxb (http://www.oracle.com/technetwork/articles/javase/index-140168.html)

Upvotes: 3

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