JAXB编组布尔成一个复杂的类型 [英] JAXB marshalling boolean into a complex type

问题描述

我在JAXB新的，我想做些什么，我不知道它是可行的。我有一个Java类马歇尔是这样的：

I am new in JAXB and I would like to do something i don't know if it's doable. I have a java class to marshall like this :

@XmlAccessorType(XMLAccessType.NONE)
public class MyClass {
  @XmlElement
  private String a = "x";
  @XmlElement
  private String b = "xx";
  @XmlElement
  private boolean c = true;
  ...
}

和希望像这样的XML输出​​：

and want XML output like this :

<?xml ...?>
<MyClass>
    <a>x</a>
    <b>xx</b>
    <c value="true"/>
</MyClass>

一个解决方案我心目中是使用一个布尔包装类，使其工作，但我想避免这种情况，因为它需要我走能够使用布尔原始的真，假。

One solution i have in mind is to use a boolean wrapper class to make it work, but i would like to avoid this as it takes me away the ability to use boolean primitive true, false.

我们能做到在JAXB？

Can we do that in JAXB?

推荐答案

您可以创建一个 XmlAdapter 来得到你所寻找的行为。一个 XmlAdapter 转换域对象为另一种类型的编组和解组的目的。

Leverage An XmlAdapter

You could create an XmlAdapter to get the behaviour you are looking for. An XmlAdapter converts a domain object into another type for the purposes of marshalling and unmarshalling.

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class BooleanAdapter extends XmlAdapter<BooleanAdapter.AdaptedBoolean, Boolean> {

    public static class AdaptedBoolean {

        @XmlAttribute
        public boolean value;

    }

    @Override
    public Boolean unmarshal(AdaptedBoolean adaptedBoolean) throws Exception {
        return adaptedBoolean.value;
    }

    @Override
    public AdaptedBoolean marshal(Boolean v) throws Exception {
        AdaptedBoolean adaptedBoolean = new AdaptedBoolean();
        adaptedBoolean.value = v;
        return adaptedBoolean;
    }

}

使用 XmlAdapter

要使用 XmlAdapter 映射的领域将需要类型的布尔而不是布尔。您存取方法仍然可以布尔如果你想。

To Use the XmlAdapter

To use the XmlAdapter your mapped field will need to be of type Boolean instead of boolean. You accessor methods can still be boolean if you want.

import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlAccessorType(XmlAccessType.NONE)
public class MyClass {
    @XmlElement
    private String a = "x";
    @XmlElement
    private String b = "xx";

    @XmlElement
    @XmlJavaTypeAdapter(BooleanAdapter.class)
    private Boolean c = true;

    public boolean getC() {
        return c;
    }

    public void setC(boolean c) {
        this.c = c;
    }
}

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