如何使用jackson将单个对象的json数组作为数组返回

Question

我已经创建了ObjectMapper并且还在web.xml中添加了包名，但仍未将单个对象视为数组

import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;

@Produces(MediaType.APPLICATION_JSON)
@Provider
public class ObjectMapperProvider implements ContextResolver<ObjectMapper>
{
    ObjectMapper mapper;

    public ObjectMapperProvider() {
        mapper = new ObjectMapper();
        mapper.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return mapper;
    }
}