Several decimal for double in JAXB

Question

I create XML with JAXB, and I want to put double inside tags:

@XmlElement(name = "TaxFree")
private double taxFreeValue;

When I set value with setTaxFreeValue(4.5); in tags shows <TaxFree>4.5<TaxFree>

Is it possible in JAXB to get this <TaxFree>4.500<TaxFree> without transfer double to string?

For double values `4.5 == 4.500`. So I don't really understand your question. — Hovercraft Full Of Eels, May 07 '13 at 22:23
I need this format 4.500 in XML tags, I know that is value same. — Juraj Ćutić, May 07 '13 at 22:25
What about creating a wrapper class that changes the field to Strings and back again. — Hovercraft Full Of Eels, May 07 '13 at 22:27
Thanks, that can be solution, but if JAXB have some annotation witch create this format? — Juraj Ćutić, May 07 '13 at 22:31
If you have another program that consumes this XML, and that program requires `4.500` and cannot deal with `4.5` then I suggest that program is broken. — Jim Garrison, May 07 '13 at 22:33

score 5 · Answer 1 · answered May 08 '13 at 03:01

5

The simplest way is this

double taxFreeValue;

@XmlElement(name = "TaxFree")
private String getTaxFree() {
    return String.format("%.3f", taxFreeValue);
}

Note that you can give this method any name and make it private JAXB dont care as soon as the annotation is present.

answered May 08 '13 at 03:01

Evgeniy Dorofeev

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Worked for me, if anyone has problems, make sure to check the `@XmlAccessorType` of your class. I have it on `@XmlAccessorType(XmlAccessType.NONE)` so marshalling that it only takes into account `@XmlElement` annotations. – Touniouk Jul 10 '20 at 03:05

score 4 · Accepted Answer · edited May 23 '17 at 12:33

4

You can use an XmlAdapter to convert from the double value to the desired text (String) representation.

Using JAXB generated class for an element that requires an integer with a pattern

edited May 23 '17 at 12:33

Community

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answered May 07 '13 at 23:48

bdoughan

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Thanks, you have great blog for learning and answers here about JAXB. – Juraj Ćutić May 08 '13 at 07:47

score 1 · Answer 3 · answered Oct 09 '20 at 16:36

The cleanest way I've found is to use XMLAdapter. Create a DoubleAdapter class with:

public class DoubleAdapter extends XmlAdapter<String, Double> {
    @Override
    public Double unmarshal(String v) throws Exception {
        if (v == null || v.isEmpty() || v.equals("null")) {
            return null;
        }
        return Double.parseDouble(v);
    }

    @Override
    public String marshal(Double v) throws Exception {
        if (v == null) {
            return null;
        }
        //Edit the format to your needs
        return String.format("%.3f", v);
    }
}

To use it, simply add the annotation.

@XmlElement(name = "TaxFree")
@XmlJavaTypeAdapter(DoubleAdapter.class)
private double taxFreeValue;

Several decimal for double in JAXB

3 Answers3