JAXBElement Boolean
到底是什么?我如何将其设置为与“true
”等效的 boolean 值?
方法:
public void setIncludeAllSubaccounts(JAXBElement<Boolean> paramJAXBElement)
{
this.includeAllSubaccounts = paramJAXBElement;
}
这不编译:
returnMessageFilter.setIncludeAllSubaccounts(true);
最佳答案
JAXBElement
是在 JAXB (JSR-222) 实现无法单独根据值判断要做什么时作为模型的一部分生成的。在您的示例中,您可能有一个类似的元素:
<xsd:element
name="includeAllSubaccounts" type="xsd:boolean" nillable="true" minOccurs="0"/>
生成的属性不能是boolean
,因为boolean
不代表null
。您可以将属性设置为 Boolean
,但是您如何区分丢失的元素和使用 xsi:nil
设置的元素。这就是 JAXBElement 的用武之地。请参阅下面的完整示例:
福
package forum12713373;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Foo {
@XmlElementRef(name="absent")
JAXBElement<Boolean> absent;
@XmlElementRef(name="setToNull")
JAXBElement<Boolean> setToNull;
@XmlElementRef(name="setToValue")
JAXBElement<Boolean> setToValue;
}
对象工厂
package forum12713373;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
import javax.xml.namespace.QName;
@XmlRegistry
public class ObjectFactory {
@XmlElementDecl(name="absent")
public JAXBElement<Boolean> createAbsent(Boolean value) {
return new JAXBElement(new QName("absent"), Boolean.class, value);
}
@XmlElementDecl(name="setToNull")
public JAXBElement<Boolean> createSetToNull(Boolean value) {
return new JAXBElement(new QName("setToNull"), Boolean.class, value);
}
@XmlElementDecl(name="setToValue")
public JAXBElement<Boolean> createSetToValue(Boolean value) {
return new JAXBElement(new QName("setToValue"), Boolean.class, value);
}
}
演示
package forum12713373;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Foo.class);
ObjectFactory objectFactory = new ObjectFactory();
Foo foo = new Foo();
foo.absent = null;
foo.setToNull = objectFactory.createSetToNull(null);
foo.setToValue = objectFactory.createSetToValue(false);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(foo, System.out);
}
}
输出
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<foo>
<setToNull xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
<setToValue>false</setToValue>
</foo>
关于java - JAXBElement<Boolean> 与 boolean 值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12713373/