DynamoDBMapper 地图支持 (java)

Question

我正在尝试使用 com.amazonaws.services.dynamodb.datamodeling.DynamoDBMapper.save() 编写地图并收到此错误：

Exception in thread "main" 
com.amazonaws.services.dynamodb.datamodeling.DynamoDBMappingException: 
Unsupported type: interface java.util.Map for public java.util.Map Config.getAttributes()

DynamoDBMapper不支持地图吗？

Answer 1

创建一个 HashMapMarshaller

public class HashMapMarshaller extends JsonMarshaller<HashMap<String, String>> 

{
    @Override
    public String marshall(HashMap<String, String> obj) {
        return super.marshall(obj);
    }

    @Override
    public HashMap<String, String> unmarshall(Class<HashMap<String, String>> clazz, String json) {
        return super.unmarshall(clazz, json);
    }
}

然后将其分配给您的财产

@DynamoDBMarshalling(marshallerClass=HashMapMarshaller.class)