Jaxb complex xml unmarshall

我有问题解组下面的嵌套xml。 有人可以告诉我，如果我遗失了什么。
body标签可以包含任何Jaxb anotated obj。
我是否必须创建一个自定义适配器来编组/解组这样的xml？

输入XML

     1234    

我的Jaxb注释类是：

 @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "serviceRq") public class ServiceRq{ private Object body;  } 

这里，body可以是任何jaxb注释对象，在本例中是其CreateRq。

 @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "createRq") public class CreateRq{ private String id;  } 

我正在寻找一种通用的方法来支持输入xml体中的任何Jaxb带注释的对象。

Answer 1

您可以使用@XmlAnyElement(lax=true)和XmlAdapter来处理此用例：

ServiceRq

 import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "serviceRq") public class ServiceRq{ @XmlJavaTypeAdapter(value=BodyAdapter.class) private Object body; // getters and setters omitted } 

BodyAdapter

 import javax.xml.bind.annotation.adapters.XmlAdapter; public class BodyAdapter extends XmlAdapter{ @Override public Object unmarshal(Body v) throws Exception { return v.getValue(); } @Override public Body marshal(Object v) throws Exception { Body body = new Body(); body.setValue(v); return body; } } 

身体

 import javax.xml.bind.annotation.XmlAnyElement; public class Body { private Object value; @XmlAnyElement(lax=true) public Object getValue() { return value; } public void setValue(Object value) { this.value = value; } } 

CreateRq

 import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "createRq") public class CreateRq{ private String id; // getters and setters omitted } 

演示

 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(ServiceRq.class); System.out.println(jc); Unmarshaller unmarshaller = jc.createUnmarshaller(); ServiceRq serviceRq = (ServiceRq) unmarshaller.unmarshal(new File("input.xml")); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(serviceRq, System.out); } } 

了解更多信息

• http://bdoughan.blogspot.com/2010/08/using-xmlanyelement-to-build-generic.html
• http://bdoughan.blogspot.com/2010/07/xmladapter-jaxbs-secret-weapon.html
• http://bdoughan.blogspot.com/2010/12/jaxb-and-immutable-objects.html
• http://bdoughan.blogspot.com/2010/12/represent-string-values-as-element.html

Answer 2

您可以在EclipseLink JAXB（MOXy）中使用@XmlAnyElement(lax=true)和@XmlPath扩展来处理这个用例（注意：我是MOXy的主管）。 对于适用于任何JAXB实现（ Metro ， MOXy ， JaxMe等）的方法，请参阅： Jaxb complex xml unmarshall 。

ServiceRq

 import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAnyElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; import org.eclipse.persistence.oxm.annotations.XmlPath; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "serviceRq") public class ServiceRq{ @XmlPath("body/createRq") @XmlAnyElement(lax=true) private Object body; // getters and setters omitted } 

CreateRq

 import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "createRq") public class CreateRq{ private String id; // getters and setters omitted } 

演示

 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(ServiceRq.class); Unmarshaller unmarshaller = jc.createUnmarshaller(); ServiceRq serviceRq = (ServiceRq) unmarshaller.unmarshal(new File("input.xml")); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(serviceRq, System.out); } } 

jaxb.properties

要将MOXy用作JAXB提供程序，必须在与域模型相同的包中包含名为jaxb.properties的文件，并使用以下条目：

 javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory 

了解更多信息

• http://bdoughan.blogspot.com/2010/08/using-xmlanyelement-to-build-generic.html
• http://bdoughan.blogspot.com/2011/05/specifying-eclipselink-moxy-as-your.html
• http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
• http://bdoughan.blogspot.com/2011/03/map-to-element-based-on-attribute-value.html