我想在从JavaBeans编组时使用JAXB向Xml Elements添加一些属性。 Xml元素是简单的数据类型，如String。所以我不想创建新的类。例如，期望的输出将是：
<notifications>
<date>04/20/2011</date>
<subject creditcard_num="22678" checknum="8904">Credit Card Charge Back</subject>
<body payment_amount="34.00" return_status="charged back">some text</body>
</notifications
我不想将主题和正文定义为单独的类。
-Anand
答案 0 :(得分：6)
我的解决方案需要为主题和正文定义一个类，但所需的输出将按要求进行 我使用@XmlValue作为消息，使用@XmlAttribute作为属性
@Test
public void testAll() throws JAXBException
{
String msg = "<notifications><date>04/20/2011</date><subject creditcard_num='22678' checknum='8904'>Credit Card Charge Back</subject><body payment_amount='34.00' return_status='charged back'>some text</body></notifications>";
Notifications tested = (Notifications) JAXBContext.newInstance(Notifications.class).createUnmarshaller().unmarshal(new StringReader(msg));
assertEquals("Credit Card Charge Back",tested.subject.value);
assertEquals("8904",tested.subject.checknum);
assertEquals("22678",tested.subject.creditcard_num);
}
@XmlRootElement
public static class Notifications{
public String date;
public Subject subject;
}
public static class Subject
{
@XmlValue
public String value;
@XmlAttribute(name="creditcard_num")
public String creditcard_num;
@XmlAttribute(name="checknum")
public String checknum;
}
注意：我只写了主题部分，我想知道是否可以使用@XmlPath来删除不同类的需要
答案 1 :(得分：2)
您可以使用EclipseLink JAXB (MOXy)的@XmlPath注释来解决此问题（我是MOXy技术主管）：
通知
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import org.eclipse.persistence.oxm.annotations.XmlPath;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Notifications {
private String date;
@XmlPath("subject/@creditcard_num")
private String creditcardNum;
@XmlPath("subject/@checknum")
private String checknum;
private String subject;
@XmlPath("body/@payment_amount")
private String paymentAmount;
@XmlPath("body/@return_status")
private String returnStatus;
private String body;
}
<强> jaxb.properties
要将MOXy用作JAXB实现，您需要将名为jaxb.properties的文件放在与模型类相同的包中，并使用以下条目：
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
<强>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(Notifications.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
Notifications notifications = (Notifications) unmarshaller.unmarshal(new File("input.xml"));
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(notifications, System.out);
}
}
更多信息：