究竟什么是JAXBElement布尔值,如何将其设置为布尔等效于“true”？
方法：
public void setIncludeAllSubaccounts(JAXBElement<Boolean> paramJAXBElement)
{
this.includeAllSubaccounts = paramJAXBElement;
}
这不编译：
returnMessageFilter.setIncludeAllSubaccounts(true);
解决方法
当JAXB(JSR-222)实现无法仅根据值来判断要执行的操作时,JAXBElement将作为模型的一部分生成.在您的示例中,您可能有一个元素,如：
<xsd:element
name="includeAllSubaccounts" type="xsd:boolean" nillable="true" minOccurs="0"/>
生成的属性不能是布尔值,因为布尔值不表示null.您可以将属性设为布尔值,但是如何区分缺少的元素和使用xsi：nil的元素集.这就是JAXBElement的用武之地.请参阅下面的完整示例：
富
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;
}
的ObjectFactory
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"),value);
}
@XmlElementDecl(name="setToValue")
public JAXBElement<Boolean> createSetToValue(Boolean value) {
return new JAXBElement(new QName("setToValue"),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);
}
}
产量
<?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>
