注意： 我是 Eclipselink
JAXB（MOXy）的 负责人，并且是 JAXB
2（JSR-222） 专家组的成员。
您可以使用Eclipselink JAXB中的外部绑定文档来映射XML模式之间的差异。
供应商1
您可以使用标准的JAXB批注来映射供应商之一：
package forum9419732;import javax.xml.bind.annotation.*;@XmlRootElement@XmlAccessorType(XmlAccessType.FIELD)public class Customer { @XmlAttribute private int id; private String lastName; private String firstName; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; }}供应商2
我们将使用MOXy的外部元数据来自定义注释提供的元数据。在
oxm-v2.xml下面的文档（）中，我们将
firstName和
lastName属性映射到XML属性：
<?xml version="1.0"?><xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm" package-name="forum9419732"> <java-types> <java-type name="Customer"> <java-attributes> <xml-attribute java-attribute="firstName"/> <xml-attribute java-attribute="lastName"/> </java-attributes> </java-type> </java-types></xml-bindings>
供应商3
同样，我们将使用MOXy的外部绑定文档（oxm-v3.xml）覆盖注释。这次，我们将使
id属性成为XML元素。
<?xml version="1.0"?><xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm" package-name="forum9419732"> <java-types> <java-type name="Customer"> <java-attributes> <xml-element java-attribute="id" name="identifier"/> </java-attributes> </java-type> </java-types></xml-bindings>
演示版
下面的示例代码演示了如何指定外部元数据。请注意，我是如何引入第四家供应商来表明可以组合外部元数据文档的。
package forum9419732;import java.util.*;import javax.xml.bind.*;import org.eclipse.persistence.jaxb.JAXBContextFactory;public class Demo { public static void main(String[] args) throws JAXBException { Customer customer = new Customer(); customer.setId(123); customer.setFirstName("Jane"); customer.setLastName("Doe"); // VENDOR 1 JAXBContext jcV1 = JAXBContext.newInstance(Customer.class); marshal(jcV1, customer); // VENDOR 2 Map<String, Object> propertiesV2 = new HashMap<String, Object>(1); propertiesV2.put(JAXBContextFactory.ECLIPSElink_OXM_XML_KEY, "forum9419732/oxm-v2.xml"); JAXBContext jcV2 = JAXBContext.newInstance(new Class[] {Customer.class}, propertiesV2); marshal(jcV2, customer); // VENDOR 3 Map<String, Object> propertiesV3 = new HashMap<String, Object>(1); propertiesV3.put(JAXBContextFactory.ECLIPSElink_OXM_XML_KEY, "forum9419732/oxm-v3.xml"); JAXBContext jcV3 = JAXBContext.newInstance(new Class[] {Customer.class}, propertiesV3); marshal(jcV3, customer); // VENDOR 4 Map<String, Object> propertiesV4 = new HashMap<String, Object>(1); List<String> oxmV4 = new ArrayList<String>(2); oxmV4.add("forum9419732/oxm-v2.xml"); oxmV4.add("forum9419732/oxm-v3.xml"); propertiesV4.put(JAXBContextFactory.ECLIPSElink_OXM_XML_KEY, oxmV4); JAXBContext jcV4 = JAXBContext.newInstance(new Class[] {Customer.class}, propertiesV4); marshal(jcV4, customer); } private static void marshal(JAXBContext jc, Customer customer) throws JAXBException { Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(customer, System.out); System.out.println(); }}输出量
以下是每个供应商的输出。请记住，使用的相同实例
Customer来制作每个这些XML文档。
<?xml version="1.0" encoding="UTF-8"?><customer id="123"> <lastName>Doe</lastName> <firstName>Jane</firstName></customer><?xml version="1.0" encoding="UTF-8"?><customer id="123" lastName="Doe" firstName="Jane"/><?xml version="1.0" encoding="UTF-8"?><customer> <identifier>123</identifier> <lastName>Doe</lastName> <firstName>Jane</firstName></customer><?xml version="1.0" encoding="UTF-8"?><customer lastName="Doe" firstName="Jane"> <identifier>123</identifier></customer>
想要查询更多的信息
- http://blog.bdoughan.com/search/label/jaxb.properties
- http://blog.bdoughan.com/2010/12/extending-jaxb-representing-annotations.html
- http://blog.bdoughan.com/2011/09/mapping-objects-to-multiple-xml-schemas.html
