QuestionImageService.java 文件源码

/**
 * This method save an image into GridFS/MongoDB based on a byteArrayOutputStream.
 * Existing image should be deleted before saving/updating an image
 * @param questionId The id of the question to be saved
 * @return return the name of the saved image in the GridFS / MongoDB.
 * @throws IOException Thrown when the input stream cannot be closed
 */
public String saveQuestionImage(MultipartFile multipartFile,
    String questionId) throws IOException {
  try (InputStream in = multipartFile.getInputStream()) {
    String contentType = mimeTypeDetector.detect(multipartFile);
    GridFSFile gridFsFile = this.operations.store(in, 
        "/questions/" + questionId, contentType);
    gridFsFile.validate();
    return gridFsFile.getFilename();      
  }
}