java使用自定义类作为JAXWS参数：如何为类型安全枚举编写JAXB适配器？

Question

我有一些旧代码（Java 1.5之前）使用类实现类型安全枚举，比如：

public class MyTypeSafeEnum implements java.io.Serializable {
  private final int value;

  private  MyTypeSafeEnum(int value) {
   this.value = value
  }

  public static final MyTypeSafeEnum FIRST_VALUE = new MyTypeSafeEnum(0)
  public static final MyTypeSafeEnum SECOND_VALUE = new MyTypeSafeEnum(1)
  public static final MyTypeSafeEnum THIRD_VALUE = new MyTypeSafeEnum(2)

  public static fromInt(int value) {
   //Builds a MyTypeSafeEnum from the value, implementation omitted
   return theMyTypeSafeEnum;
  }

  public int getValue() {
    return this.value;
  }
 }

我想在JAX-WS操作中将这些枚举类用作参数，但在生成的WSDL中，类型的定义为空：

<xs:complexType name="myTypeSafeEnum">
  <xs:sequence/>
</xs:complexType>

我想我应该使用XmlAdapter，所以我创建了以下类：

public class MyTypeSafeEnumXmlAdapter extends XmlAdapter<MyTypeSafeEnum, Integer> {
  @Override
  public MyTypeSafeEnum marshal(Integer v) throws Exception {
      return MyTypeSafeEnum.fromInt(v);
  }

  @Override
  public Integer unmarshal(MyTypeSafeEnum e) throws Exception {
      return e.getValue();
  }
}

我向类中添加了@XmlJavaTypeAdapter(MyTypeSafeEnumXmlAdapter.class)注释，但在生成的WSDL中没有效果

如何在JAX-WS操作中使用这些类作为参数？目前，重构代码以使用enum类型是不可能的

Answer 1

您需要颠倒MyTypeSafeEnumXmlAdapter中类型的顺序：

public class MyTypeSafeEnumXmlAdapter extends XmlAdapter<Integer, MyTypeSafeEnum> {
    @Override
    public Integer marshal(MyTypeSafeEnum v) throws Exception {
        return v.getValue();
    }

    @Override
    public MyTypeSafeEnum unmarshal(Integer v) throws Exception {
        return MyTypeSafeEnum.fromInt(v);
    }
}

那么如果你有这样一个类：

public class MyClass {
    private MyTypeSafeEnum someVar;

    @XmlJavaTypeAdapter(MyTypeSafeEnumXmlAdapter.class)
    public MyTypeSafeEnum getSomeVar() {
        return someVar;
    }
}

它将生成如下所示的XML：

<xs:complexType name="myClass">
    <xs:sequence>
        <xs:element minOccurs="0" name="someVar" type="xs:int"/>
    </xs:sequence>
</xs:complexType>

web服务客户端将该字段视为整数。因此，您必须确保它们不会传入未映射到某个枚举实例的整数，或者以某种方式处理它