How to make xml schema relate(link) to JTable,xml java?

Question

Here you can see my application:

So what i need to do:

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Answer 1

"Here is writing to xml file:" ---- "And here loading my xml file:"

Why are you using DOM to read and write the xml, when you are already using JAXB Mapping. If you are doing the mapping correctly ¹, it's just a matter of using the Marshaller and Unmarshaller to write and read, respectively. Make sure to look at those API links yo see example usage. It's only around 5 lines of code to handle each operaion.

_{(1) Please see the JAXB tutorial for more info about JAXB mapping.}

Also, you can just create your own AbstractTableModel and unmarshal and marshal straight to and from the table model. This is probably the most effective way to keep everything sync. Create a class Auto to represent each row, and a class AutoModel, that will be the root element in the xml document, as well as the TableModel for the JTable. Something like:

Auto class

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Auto", propOrder = {
        "id", "VIN", "Make", "Model", "Year", "Description", "Cost"
})
public class Auto {
    @XmlElement(name = "id")
    Integer id;
    @XmlElement(name = "VIN")
    String VIN;
    @XmlElement(name = "Make")
    String Make;
    @XmlElement(name = "Model")
    String Model;
    @XmlElement(name = "Year")
    Integer Year;
    @XmlElement(name = "Description")
    String Description;
    @XmlElement(name = "Cost")
    Float Cost;

    // === DON'T FORGET YOUR GETTERS and SETTERS
}

AutoModel class

@XmlRootElement(name = "AutoList")
public class AutoModel extends AbstractTableModel {
    String[] columnNames = {"VIN", "Make", "Model", "Year"};

    @XmlElement(name = "Auto")
    protected List autos;

    public AutoModel() {
        autos = new ArrayList();
    }

    @Override
    public int getRowCount() {
        return autos.size();
    }

    @Override
    public int getColumnCount() {
        return columnNames.length;
    }

    @Override
    public String getColumnName(int columnIndex) {
        return columnNames[columnIndex];
    }

    @Override
    public boolean isCellEditable(int row, int col) {
        return false;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Auto auto = autos.get(rowIndex);
        Object value = null;
        switch (columnIndex) {
            case 0 : value = auto.getVIN(); break;
            case 1 : value = auto.getMake(); break;
            case 2 : value = auto.getModel(); break;
            case 3 : value = auto.getYear(); break;
        }
        return value;
    }
}

Test, using this xml file

    
        1
        123456788910FASDE
        Mercedes
        CL 550
        2012
        Hello World
        80000.00
    

import java.awt.Dimension;
import java.io.File;
import javax.swing.*;
import javax.xml.bind.*;

public class TestTableMarshall {

    private static final String INPUT_FILE = "src/table/autos.xml";
    private static final String OUTPUT_FILE = "src/table/autos1.xml";

    public static void main(String[] args) throws Exception {
        AutoModel model = unmarshal(INPUT_FILE);
        JTable table = new JTable(model) {
            @Override
            public Dimension getPreferredScrollableViewportSize() {
                return getPreferredSize();
            }
        };
        JOptionPane.showMessageDialog(null, new JScrollPane(table));
        marshal(model, OUTPUT_FILE);

    }

    private static void marshal(AutoModel model, String file) throws Exception {
        JAXBContext context = JAXBContext.newInstance(AutoModel.class);
        Marshaller marshaller = context.createMarshaller();
        File f= new File(file);
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(model, f);
    }

    private static AutoModel unmarshal(String file) throws Exception {
        JAXBContext context = JAXBContext.newInstance(AutoModel.class);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        AutoModel model = (AutoModel)unmarshaller.unmarshal(new File(file));
        return model;
    }
}

---

As far the the AutoModel goes, it only works for your first table. You will need to create another model for your repairs table. Also, the model, currently only offered read-only. You will need to add other functionality to say add a row and set individual values.

Here are some resources to look at:

• How to Use Tables: Creating a Table Model
• JAXB Specification toturial

---

NOTE: With the JAXB annotations above you can create the schema, and you you want to validate the xml against it, you could just set the schema when you unmarshal. Something like:

private static AutoModel unmarshal(String file) throws Exception {
    JAXBContext context = JAXBContext.newInstance(AutoModel.class);
    Unmarshaller unmarshaller = context.createUnmarshaller();
    SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = factory.newSchema(new File("src/table/autos.xsd"));
    unmarshaller.setSchema(schema);
    AutoModel model = (AutoModel)unmarshaller.unmarshal(new File(file));
    return model;
}