如何使用带有 Spring @RequestParam 的自定义解串器

How to use a custom deserializer with Spring @RequestParam

我有一个不知道其实现的接口(模块方面):

public interface SomeInterface {
}

和实现它的枚举:

public enum SomeInterfaceImpl {
}

我有一个 @RestController:

@RequestMapping(method = RequestMethod.GET)
public List<SomeClass> find(@RequestParam(value = "key", required = false) SomeInterface someInt,
                            HttpServletResponse response){
}

尽管 Jackson 知道它应该将 SomeInterface 反序列化为 SomeInterfaceImpl,如下所示:

public class DefaultSomeInterfaceDeserializer extends JsonDeserializer<SomeInterface> {
    @Override
    public SomeInterface deserialize(JsonParser parser, DeserializationContext context) throws IOException {
        return parser.readValuesAs(SomeInterfaceImpl.class).next();
    }
}

和:

@Configuration
public class MyJacksonConfiguration implements BeanPostProcessor {

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

        if(bean instanceof Jackson2ObjectMapperBuilder){
            Jackson2ObjectMapperBuilder builder = (Jackson2ObjectMapperBuilder) bean;
            builder.deserializerByType(SomeInterface.class, new DefaultSomeInterfaceDeserializer());
        } 
        return bean;
    }
}

并成功将SomeInterface序列化和反序列化为@RequestBody中的SomeInterfaceImpl,似乎对SomeInterface到[=18=的映射没有任何影响] 和 @RequestParam。我该如何克服这个问题?

按照 M.Denium 的建议在应用程序上下文中使用 Converter 可以完成工作:

@Component
public class SomeInterfaceConverter implements Converter<String, SomeInterface> {

    @Override
    public SomeInterface convert(String value) {
        return new SomeInterfaceImpl(value);
    }
}