注意: 我是EclipseLink JAXB (MOXy)负责人,也是JAXB 2 (JSR-222)专家组的成员。
Blaise:我以前没有使用过 EclipseLink,但是如果采用 EclipseLink 相对简单的话,我想我可以搬出脚轮吗?只是整个项目一直在使用 Castor,所以会更加一致。但是,请您详细说明 Eclipselink。谢谢。– TYS
EclipseLink MOXy 是一个 JAXB (JSR-222) 实现。查看您的问题,可以使用任何 JAXB 实现将该模型映射到所需的 XML,如下所示:
A类
package forum9994762;
import javax.xml.bind.annotation.*;
@XmlRootElement(name="Sample")
@XmlAccessorType(XmlAccessType.FIELD)
public class ClassA {
@XmlElement(name="data")
private ClassB var1;
@XmlAttribute
private String var2;
}
B类
package forum9994762;
import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class ClassB {
@XmlAttribute(name="var4")
private ClassC var3;
}
C类
package forum9994762;
import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class ClassC {
@XmlValue
private String var4;
}
演示
package forum9994762;
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(ClassA.class);
File xml = new File("src/forum9994762/input.xml");
Unmarshaller unmarshaller = jc.createUnmarshaller();
ClassA classA = (ClassA) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(classA, System.out);
}
}
输入.xml/输出
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Sample var2="value">
<data var4="var4 value"/>
</Sample>
映射文件
作为 Castor 用户,您可能更喜欢将元数据表示为外部映射文件。EclipseLink MOXy 提供了这样一个扩展:
绑定.xml
<?xml version="1.0" encoding="UTF-8"?>
<xml-bindings
xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
package-name="forum9994762"
xml-accessor-type="FIELD">
<java-types>
<java-type name="ClassA">
<xml-root-element name="Sample"/>
<java-attributes>
<xml-element java-attribute="var1" name="data"/>
<xml-attribute java-attribute="var2"/>
</java-attributes>
</java-type>
<java-type name="ClassB">
<java-attributes>
<xml-attribute java-attribute="var3" name="var4"/>
</java-attributes>
</java-type>
<java-type name="ClassC">
<java-attributes>
<xml-value java-attribute="var4"/>
</java-attributes>
</java-type>
</java-types>
</xml-bindings>
演示
package forum9994762;
import java.io.File;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextFactory;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, "forum9994762/binding.xml");
JAXBContext jc = JAXBContext.newInstance("forum9994762", ClassA.class.getClassLoader(), properties);
File xml = new File("src/forum9994762/input.xml");
Unmarshaller unmarshaller = jc.createUnmarshaller();
ClassA classA = (ClassA) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(classA, System.out);
}
}
欲了解更多信息