java xml to Object

Question

I have a xml file like this:

<passwords>
<use>
    <title>LoL</title>
    <username>hallo</username>
    <password>asdasd</password>
    <note>asdasdasdasd</note>
</use>
<E-Mail>
    <use>
        <title>GMail</title>
        <username>hallo</username>
        <password>asdasd</password>
        <note>asdasdasdasd</note>
    </use>
    <Webmail>
        <use>
            <title>Yahoo</title>
            <username>hallo</username>
            <password>asdasd</password>
            <note>asdasdasdasd</note>
        </use>
    </Webmail>
</E-Mail>

And a class for the categories

public class Category {
    private ArrayList<Usage> usages;
    private ArrayList<Category> categories; 
    private String name;

    public Category(String name){
        this.name = name;
        usages = new ArrayList<>();
        categories = new ArrayList<>();
    }
    public void addUsage(Usage usage){
        usages.add(usage);
    }
    public void addCategory(Category category){
       categories.add(category);
    }
}

and the use

public class Usage {
private String title;
private String username;
private String password;
private String notes;


public void setTitle(String title) {
    this.title = title;
}
public void setUsername(String username) {
    this.username = username;
}
public void setPassword(String password) {
    this.password = password;
}
public void setNotes(String notes) {
    this.notes = notes;
}


public String getUsername() {
    return username;
}
public String getPassword() {
    return password;
}
public String getNotes() {
    return notes;
}
public String getTitle(){
    return title;
}

public String toString(){
    return "[[" + this.title + "][" + this.username + "][" + this.password + "][" + this.notes + "]]";
}
}

I want to get 1 category object with the other categories and usages in the arraylist but I can't figure out how to analyse it with the standard parsers.

I know how to do it with only one category and no sub-categories.

Ravi K Thapliyal · Accepted Answer · 2013-06-11 14:21:50Z

As mentioned you can use JAXB, this is a very basic example, just for you to see how easy is to work with this useful tool:

First, it would be better if you turn your XML into a schema, you can use:

http://www.freeformatter.com/xsd-generator.html

But if you wanna work with your class, then you can use annotations, for example, this is a basic class:

@XmlRootElement(name = "programmer")
public class ProgrammerBean implements Serializable {
 //Here attributes and getters and setters.
}

I will declare a class which is a singleton to manage my class:

public class XMLFileHandler {

    private static XMLFileHandler instance;

    private XMLFileHandler() {
    }

    public static XMLFileHandler getInstance() {
        if (instance == null) {
            instance = new XMLFileHandler();
        }
        return instance;
    }

    public void writeXml(String filePath, Object targetObject)
            throws FileNotFoundException, JAXBException {
        File xmlFile = new File(filePath);
        OutputStream xmlOutput = new FileOutputStream(xmlFile);
        // Define a JAXBContext
        JAXBContext context = null;
        // When I write I use a marshaller
        Marshaller xmlWriter = null;

        // I set the class of the objet to write
        context = JAXBContext.newInstance(targetObject.getClass());
        // I create the marshaller
        xmlWriter = context.createMarshaller();
        // I set the properties for the output
        xmlWriter.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        // Finally write
        xmlWriter.marshal(targetObject, xmlOutput);

    }

    public Object readXml(String filePath, Class objType) throws JAXBException {
        Object read = null;
        JAXBContext context = null;
        Unmarshaller xmlReader = null;

        context = JAXBContext.newInstance(objType);
        xmlReader = context.createUnmarshaller();
        read = xmlReader.unmarshal(new File(filePath));
        return read;
    }
}

Then, for usage you can:

XmlFileHandler xmlHandler = XmlFileHandler.getInstance();
ProgrammerBean myObject = (ProgrammerBean) xmlHandler.readXml("/home/developer/programmer.xml", ProgrammerBean.class);

Hope it helped you with the basics of JaxB, as mentioned it would be easier if you use an schema and generate jaxb classes from it, then it is just a matter of set and get methods. Best regards.

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