如何解决JAXB / MOXy：缺少元素时不调用XmlElementWrapper setter吗？
| 我在一个用@XmlElementWrapper（name = \“ foos \”）和@XmlElement（name = \“ foo \”）注释的类上有一个列表设置器。 当我解组没有解决方法
您可以在此用例中使用XmlAdapter：
input1.xml
没有的时候，不要打电话
塞特犬。或者如果二传手必须是
调用，传递null。
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child/>
</root>
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child>
<foos/>
</child>
</root>
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child>
<foos>
<foo>Hello World</foo>
</foos>
</child>
</root>
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
@XmlRootElement
public class Root {
private Child child;
@XmlJavaTypeAdapter(ChildAdapter.class)
public Child getChild() {
return child;
}
public void setChild(Child child) {
this.child = child;
}
}
import java.util.List;
public class Child {
private List<String> strings;
public List<String> getStrings() {
return strings;
}
public void setStrings(List<String> strings) {
System.out.println(\"setStrings\");
this.strings = strings;
}
}
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public class ChildAdapter extends XmlAdapter<ChildAdapter.AdaptedChild,Child> {
public static class AdaptedChild {
public Foos foos;
}
public static class Foos {
public List<String> foo;
}
@Override
public Child unmarshal(AdaptedChild adaptedChild) throws Exception {
Child child = new Child();
Foos foos = adaptedChild.foos;
if(null != foos) {
List<String> foo = foos.foo;
if(null == foo) {
child.setStrings(new ArrayList<String>());
} else {
child.setStrings(foos.foo);
}
}
return child;
}
@Override
public AdaptedChild marshal(Child child) throws Exception {
AdaptedChild adaptedChild = new AdaptedChild();
List<String> strings = child.getStrings();
if(null != strings) {
Foos foos = new Foos();
foos.foo = strings;
adaptedChild.foos = foos;
}
return adaptedChild;
}
}
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Root.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
Object o;
o = unmarshaller.unmarshal(new File(\"input1.xml\"));
marshaller.marshal(o,System.out);
o = unmarshaller.unmarshal(new File(\"input2.xml\"));
marshaller.marshal(o,System.out);
o = unmarshaller.unmarshal(new File(\"input3.xml\"));
marshaller.marshal(o,System.out);
}
}
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child/>
</root>
setStrings
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child>
<foos/>
</child>
</root>
setStrings
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<root>
<child>
<foos>
<foo>Hello World</foo>
</foos>
</child>
</root>
public class ListOfFooAdapter extends XmlAdapter<ListOfFooAdapter.Adapted,List<Foo>> {
@XmlRootElement(name = \"foos\")
public static class Adapted {
public List<Foo> foo;
}
@Override
public List<Foo> unmarshal(Adapted adapted) throws Exception {
return adapted.foo;
}
@Override
public Adapted marshal(List<Foo> foo) throws Exception {
if (null == foo) {
return null;
} else {
Adapted adapted = new Adapted();
adapted.foo = foo;
return adapted;
}
}
}
@XmlJavaTypeAdapter(ListOfFooAdapter.class)
public List<Foo> getFoos() {
...
}
public void setFoos(List<Foo> l) {
...
}
@XmlElementWrapper(name = \"foos\")
@XmlElement(name = \"foo\")
public void setFoos(List<Foo> newFoos) {
this.foos.clear();
this.foos.addAll(newFoos);
}
@XmlElementWrapper(name = \"foos\")
@XmlElement(name = \"foo\")
public void setFoos(List<Foo> newFoos) {
this.foos = newFoos;
}
beforeUnmarshall
afterUnmarshall
Unmarshaller
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