如何在 Jersey 中动态指定默认值？

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface DynamicDefaultValue {
    String value();
}

import javax.ws.rs.ext.ParamConverter;
import javax.ws.rs.ext.ParamConverterProvider;
import javax.ws.rs.ext.Provider;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

@Provider
public class DynamicDefaultValueProvider implements ParamConverterProvider {

    @Override
    public <T> ParamConverter<T> getConverter(Class<T> rawType, Type genericType, Annotation[] annotations) {
        for (Annotation annotation : annotations) {
            if (annotation instanceof DynamicDefaultValue) {
                DynamicDefaultValue dynamicDefaultValue = (DynamicDefaultValue) annotation;
                return new ParamConverter<T>() {
                    @Override
                    public T fromString(String value) {
                        return (T) value;
                    }

                    @Override
                    public String toString(T value) {
                        return dynamicDefaultValue.value();
                    }
                };
            }
        }
        return null;
    }
}

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.QueryParam;

@Path("/example")
public class ExampleResource {

    @GET
    public String getExample(@DynamicDefaultValue("defaultValue") @QueryParam("param") String param) {
        return "The value of param is: " + param;
    }
}