java - 如何在运行时使用 JAXB 注释

Question

我有以下 bean 类

@XmlRootElement(name = "book")
//Optional
@XmlType(propOrder = {"name" })
public class Book {

private String name;
private int num;

@XmlTransient
public int getNum() {
    return num;
}

public void setNum(int num) {
    this.num = num;
}

// name for your XML-Output:
@XmlElement(name = "bookName")
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
}

和相应的编码代码

private static void marshalXML(Book bookstore) {

    Writer w = null;
    try {
        // create JAXB context and instantiate marshaller
        JAXBContext context = getContext();
        if (context != null) {
            Marshaller m = context.createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            m.marshal(bookstore, System.out);
            w = new FileWriter(BOOKSTORE_XML);
            m.marshal(bookstore, w);
        }
    } catch (Exception e) {
        System.out.println("error in marshalling");
    } finally {
        try {
            w.close();
        } catch (Exception e) {
        }
    }
}

我想让属性在运行时可配置，我想在运行时而不是编译时在“num”上指定@xmltransient。我该怎么做？

Answer 1

注意:我是 EclipseLink JAXB (MOXy) JAXB 2 (JSR-222) 专家组的负责人和成员。

MOXy JAXB 实现提供了通过其 MetadataSource 扩展在运行时操作映射元数据的能力。有关详细示例，请参阅:

• > http://blog.bdoughan.com/2011/06/moxy-extensible-models-refresh-example.html