我想将 Java 对象编码为 XML。对于这种方法,我将 JAXB Moxy 与外部 XML 绑定(bind)文件结合使用。
这是一个示例类,我希望将其编码为 XML:
public class Customer {
private String lastname;
private String firstname;
//getters and setters
}
通过我的外部绑定(bind)文件,我可以访问此类的值,以便获得以下 XML 输出:
<?xml version="1.0"?>
<customer>
<firstname>Tony</firstname>
<lastname>Stark</lastname>
</customer>
现在我想添加一个自定义标记,其自定义值未在 java 类中指定。因此,对于上面的 Customer 类,我想要这样的 XML 输出:
<?xml version="1.0"?>
<customer>
<firstname>Tony</firstname>
<lastname>Stark</lastname>
<birthdate>01.01.1990</birthdate>
</customer>
生日不在客户类中,我不想将其添加到那里,因为此类是由脚本自动生成的。我的目标是使用外部绑定(bind)文件中的自定义值定义生日。这对于 JAXB MOXY 实现来说是可能的吗? 希望有人能帮助我。
最佳答案
下面是您可以利用 XmlAdapter
来执行此操作的方法:
XmlAdapter(姓氏适配器)
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public class LastNameAdapter extends XmlAdapter<LastNameAdapter.AdaptedLastName, String> {
@XmlType(propOrder={"lastname", "birthdate"})
public static class AdaptedLastName {
public String lastname;
public String birthdate;
}
private String birthdate;
public LastNameAdapter() {
}
public LastNameAdapter(String birthdate) {
this.birthdate = birthdate;
}
@Override
public String unmarshal(AdaptedLastName v) throws Exception {
return v.lastname;
}
@Override
public AdaptedLastName marshal(String v) throws Exception {
AdaptedLastName adaptedLastName = new AdaptedLastName();
adaptedLastName.lastname = v;
adaptedLastName.birthdate = birthdate;
return adaptedLastName;
}
}
外部元数据 (oxm.xml)
<?xml version="1.0"?>
<xml-bindings
xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
package-name="forum19641824">
<java-types>
<java-type name="Customer">
<xml-root-element/>
<xml-type prop-order="firstname lastname"/>
<java-attributes>
<xml-element java-attribute="firstname"/>
<xml-element java-attribute="lastname" xml-path=".">
<xml-java-type-adapter value="forum19641824.LastNameAdapter"/>
</xml-element>
</java-attributes>
</java-type>
</java-types>
</xml-bindings>
演示
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put(JAXBContextProperties.OXM_METADATA_SOURCE, "forum19641824/oxm.xml");
JAXBContext jc = JAXBContext.newInstance(new Class[] {Customer.class}, properties);
Customer customer = new Customer();
customer.setFirstname("Tony");
customer.setLastname("Stark");
Marshaller marshaller = jc.createMarshaller();
marshaller.setAdapter(new LastNameAdapter("01.01.1990"));
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(customer, System.out);
}
}
输出
<?xml version="1.0" encoding="UTF-8"?>
<customer>
<firstname>Tony</firstname>
<lastname>Stark</lastname>
<birthdate>01.01.1990</birthdate>
</customer>
关于java - 将自定义值添加到外部绑定(bind)(JAXB - MOXY 实现),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19641824/