JAXB为简单数据类型向XmlElement添加属性 [英] JAXB Adding attributes to a XmlElement for simple data types
问题描述
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：
I want to add some attributes to Xml Elements using JAXB when marshalling from JavaBeans. The Xml Elements are simple data types like String. So I do not want to create new Classes. For example, a desired output would be:
<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。
I do not want to define subject and body as separate classes.
-Anand
推荐答案
你可以用 EclipseLink JAXB（MOXy）的@XmlPath注释解决了这个问题（我是MOXy技术主管）：
You could use EclipseLink JAXB (MOXy)'s @XmlPath annotation to solve this problem (I'm the MOXy tech lead):
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;
}
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，并带有以下条目：
To use MOXy as your JAXB implementation you need to put a file named jaxb.properties in the same package as your model classes with the following entry:
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
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：
- http://bdoughan.blogspot.com/2010/07/xpath-based-mapping.html
- http://bdoughan.blogspot.com/2010/09/xpath-based- mapping-geocode-example.html
- http://bdoughan.blogspot.com/2011/03/map-to-element-based-on-attribute-value.html
- http://bdoughan.blogspot.com/2010/07/xpath-based-mapping.html
- http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
- http://bdoughan.blogspot.com/2011/03/map-to-element-based-on-attribute-value.html
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