code: public <V> V convertFrom(final ByteBuffer... buffers) {
          if (buffers == null || buffers.length == 0) return null;
          return (V) new AnyDecoder(factory).convertFrom(new JsonByteBufferReader((ConvertMask) null, buffers));
      }
docs: 返回非null的值是由String、ArrayList、HashMap任意组合的对象