code: public BosObject getObject(String bucketName, String key) {
          return this.getObject(new GetObjectRequest(bucketName, key));
      }
docs: Gets the object stored in Bos under the specified bucket and key.
  
  @param bucketName The name of the bucket containing the desired object.
  @param key The key under which the desired object is stored.
  @return The object stored in Bos in the specified bucket and key.