我想使用MOXy来编组/解组现有类中的对象。
我想知道我的类中是否有生成XML绑定文件（因为我不想使用注释）的意思。
或者我们是否必须用我们的小手完成这一切:)？
答案 0 :(得分：2)
默认情况下，JAXB / MOXy不需要指定任何元数据（请参阅：http://blog.bdoughan.com/2012/07/jaxb-no-annotations-required.html）。您只需要指定要覆盖默认行为的元数据。
我猜你真正的问题是创建MOXy外部映射文档的最简单方法是什么。我使用Eclipse执行以下操作，您最喜欢的IDE可能有类似的步骤：
获取MOXy映射文档的XML Schema
<EclipseLink_Home>/xsds/eclipselink_oxm_2_5.xsd
在IDE中注册XML Schema
在IDE中创建和XML文档，并将以下内容指定为根元素。
<xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"/>
使用IDE提供的自动完成功能构建XML文档。
答案 1 :(得分：1)
另一种选择是生成jaxb类，并从那些读取绑定（注释）生成外部映射（之后可以删除注释）。 PoC代码：
public class MoxyBindingGenerator {
private static final String PACKAGE = "com.company.binding.jaxbclasses";
private static ObjectFactory xmlBindingsFactory = new ObjectFactory();
public static void main(String[] args) throws Exception {
Collection<TypeInfo> typeInfos = readAnnotations();
XmlBindings xmlBindings = xmlBindingsFactory.createXmlBindings();
xmlBindings.setPackageName(PACKAGE);
JavaTypes javaTypes = xmlBindingsFactory.createXmlBindingsJavaTypes();
xmlBindings.setJavaTypes(javaTypes);
List<JavaType> javaTypesList = javaTypes.getJavaType();
XmlEnums xmlEnums = xmlBindingsFactory.createXmlBindingsXmlEnums();
xmlBindings.setXmlEnums(xmlEnums);
List<XmlEnum> xmlEnumsList = xmlEnums.getXmlEnum();
typeInfos.stream().forEach(typeInfo -> {
if (!typeInfo.isEnumerationType()) {
fillJavaTypes(javaTypesList, typeInfo);
}
else {
fillEnumTypes(xmlEnumsList, typeInfo);
}
});
saveToFile(xmlBindings);
}
private static Collection<TypeInfo> readAnnotations() throws JAXBException, Exception {
JAXBContext jaxbContext = (JAXBContext) javax.xml.bind.JAXBContext.newInstance(PACKAGE);
Object contextState = getPrivateField(jaxbContext, "contextState");
Generator generator = (Generator) getPrivateField(contextState, "generator");
AnnotationsProcessor annotationsProcessor = generator.getAnnotationsProcessor();
Collection<TypeInfo> typeInfos = annotationsProcessor.getTypeInfo().values();
return typeInfos;
}
private static void fillEnumTypes(List<XmlEnum> xmlEnumsList, TypeInfo typeInfo) {
EnumTypeInfo et = (EnumTypeInfo) typeInfo;
XmlEnum xmlEnum = xmlBindingsFactory.createXmlEnum();
xmlEnum.setJavaEnum(et.getJavaClassName());
List<String> xmlEnumNames = et.getFieldNames();
List<Object> xmlEnumValues = et.getXmlEnumValues();
for (int i = 0; i < xmlEnumNames.size(); i++) {
String xmlEnumName = xmlEnumNames.get(i);
Object xmlEnumObject = xmlEnumValues.get(i);
XmlEnumValue xmlEnumValue = xmlBindingsFactory.createXmlEnumValue();
xmlEnumValue.setJavaEnumValue(xmlEnumName);
xmlEnumValue.setValue(xmlEnumObject.toString());
xmlEnum.getXmlEnumValue().add(xmlEnumValue);
}
xmlEnumsList.add(xmlEnum);
}
private static void fillJavaTypes(List<JavaType> javaTypesList, TypeInfo typeInfo) {
JavaType javaType = xmlBindingsFactory.createJavaType();
javaType.setName(typeInfo.getJavaClassName());
fillXmlType(javaType, typeInfo);
if (typeInfo.getXmlRootElement() != null) {
XmlRootElement xmlRootElement = typeInfo.getXmlRootElement();
xmlRootElement.setNamespace(null);
javaType.setXmlRootElement(xmlRootElement);
}
JavaAttributes javaAttributes = xmlBindingsFactory.createJavaTypeJavaAttributes();
javaType.setJavaAttributes(javaAttributes);
List<JAXBElement<? extends JavaAttribute>> javaAttributeList = javaAttributes.getJavaAttribute();
typeInfo.getNonTransientPropertiesInPropOrder().stream().forEach(field -> {
fillFields(javaAttributeList, field);
});
javaTypesList.add(javaType);
}
private static void fillFields(List<JAXBElement<? extends JavaAttribute>> javaAttributeList, Property field) {
if (field.getXmlElements() != null && field.getXmlElements().getXmlElement().size() > 0) {
XmlElements xmlElements = xmlBindingsFactory.createXmlElements();
xmlElements.setJavaAttribute(field.getPropertyName());
List<XmlElement> elements = field.getXmlElements().getXmlElement();
elements.stream().forEach(e -> {
e.setDefaultValue(null);
e.setNamespace(null);
xmlElements.getXmlElement().add(e);
});
JAXBElement<XmlElements> value = xmlBindingsFactory.createXmlElements(xmlElements);
javaAttributeList.add(value);
}
else if (!field.isAttribute()) {
XmlElement value = xmlBindingsFactory.createXmlElement();
value.setJavaAttribute(field.getPropertyName());
value.setName(field.getSchemaName().getLocalPart());
if (field.isNillable())
value.setNillable(field.isNillable());
if (field.isRequired())
value.setRequired(field.isRequired());
javaAttributeList.add(xmlBindingsFactory.createXmlElement(value));
}
else {
XmlAttribute value = xmlBindingsFactory.createXmlAttribute();
value.setJavaAttribute(field.getPropertyName());
value.setName(field.getSchemaName().getLocalPart());
javaAttributeList.add(xmlBindingsFactory.createXmlAttribute(value));
}
}
private static void saveToFile(XmlBindings xmlBindings)
throws JAXBException, PropertyException, FileNotFoundException, IOException {
JAXBContext xmlModelJaxbContext =
(JAXBContext) javax.xml.bind.JAXBContext.newInstance("org.eclipse.persistence.jaxb.xmlmodel");
JAXBMarshaller marshaller = xmlModelJaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
FileOutputStream fos = new FileOutputStream(new File(System.getProperty("user.home"), "binding-imspoor-oxm.xml"));
marshaller.marshal(xmlBindings, fos);
fos.close();
}
private static void fillXmlType(JavaType javaType, TypeInfo typeInfo) {
XmlType orgXmlType = typeInfo.getXmlType();
if (orgXmlType != null) {
boolean add = false;
XmlType xmlType = xmlBindingsFactory.createXmlType();
if (!StringUtils.isEmpty(orgXmlType.getName())) {
xmlType.setName(orgXmlType.getName());
add = true;
}
if (orgXmlType.getPropOrder() != null && orgXmlType.getPropOrder().size() > 1) {
xmlType.getPropOrder().addAll(orgXmlType.getPropOrder());
add = true;
}
if (add)
javaType.setXmlType(xmlType);
}
}
private static Object getPrivateField(Object obj, String fieldName) throws Exception {
Field declaredField = obj.getClass().getDeclaredField(fieldName);
declaredField.setAccessible(true);
return declaredField.get(obj);
}
}