我决定使用简单的 XML 序列化 http://simple.sourceforge.net/并被基本问题困住了。我正在尝试序列化java.util.UUID
类实例作为这个小类中的最终字段:
@Root
public class Identity {
@Attribute
private final UUID id;
public Identity(@Attribute UUID id) {
this.id = id;
}
}
Tutorial http://simple.sourceforge.net/download/stream/doc/tutorial/tutorial.php#converters展示了如何通过注册转换器来序列化第三方对象,如下所示:
Registry registry = new Registry();
registry.bind(UUID.class, UUIDConverter.class);
Strategy strategy = new RegistryStrategy(registry);
Serializer serializer = new Persister(strategy);
serializer.write( object, stream );
UUID 的适当转换器非常简单:
public class UUIDConverter implements Converter<UUID> {
@Override
public UUID read(InputNode node) throws Exception {
return new UUID.fromString(node.getValue());
}
@Override
public void write(OutputNode node, UUID value) throws Exception {
node.setValue(value.toString());
}
}
但这个简单的代码对我来说不起作用,在序列化具有 UUID 字段的对象期间抛出异常不支持类 java.util.UUID 的转换.
我尝试过与自定义类似的东西Matcher
(教程中没有)对我有用:
Serializer serializer = new Persister(new MyMatcher());
serializer.write( object, stream );
and Matcher
类看起来像这样:
public static class MyMatcher implements Matcher {
@Override
@SuppressWarnings("unchecked")
public Transform match(Class type) throws Exception {
if (type.equals(UUID.class))
return new UUIDTransform();
return null;
}
}
public class UUIDTransform implements Transform<UUID> {
@Override
public UUID read(String value) throws Exception {
return UUID.fromString(value);
}
@Override
public String write(UUID value) throws Exception {
return value.toString();
}
}
问题:
- 对于流式传输第三方类,是否始终建议使用自定义匹配器?
- 在什么情况下我可以使用转换器?
- 有没有更好的简单 XML 教程/示例?
谢谢。