dicom文件存入MapFile

public String uploadDicom(@RequestParam("file") MultipartFile file) {
        // HDFS配置
        Configuration conf = new Configuration();
        conf.set("fs.defaultFS", "hdfs://your-hdfs-uri:9000");

        // SequenceFile输出路径
        Path seqFilePath = new Path("/path/to/your/sequencefile.seq");

        // MapFile输出路径
        Path mapFilePath = new Path("/path/to/your/mapfile.map");

        FileSystem fs = null;
        SequenceFile.Writer seqWriter = null;
        MapFile.Writer mapWriter = null;
        DicomInputStream dicomInputStream = null;

        try {
            // 获取HDFS文件系统
            fs = FileSystem.get(conf);

            // 创建SequenceFile writer
            seqWriter = SequenceFile.createWriter(conf,
                    SequenceFile.Writer.file(seqFilePath),
                    SequenceFile.Writer.keyClass(Text.class),
                    SequenceFile.Writer.valueClass(BytesWritable.class));

            // 创建MapFile writer
            mapWriter = new MapFile.Writer(conf, fs, mapFilePath.toString(),
                    Text.class, BytesWritable.class);

            // 读取接收到的DICOM文件
            InputStream inputStream = file.getInputStream();
            dicomInputStream = new DicomInputStream(inputStream);
            Attributes dicomAttributes = dicomInputStream.readDataset(-1, -1);

            // 获取序列号和检查号
            String seriesInstanceUID = dicomAttributes.getString(Tag.SeriesInstanceUID);
            String studyInstanceUID = dicomAttributes.getString(Tag.StudyInstanceUID);

            // 将DICOM文件内容转换为字节数组
            byte[] dicomBytes = dicomAttributes.toBytes(null);

            // 写入SequenceFile
            seqWriter.append(new Text(seriesInstanceUID), new BytesWritable(dicomBytes));

            // 写入MapFile
            mapWriter.append(new Text(studyInstanceUID), new BytesWritable(dicomBytes));

            return "DICOM文件成功写入SequenceFile和MapFile";
        } catch (IOException e) {
            e.printStackTrace();
            return "DICOM文件写入SequenceFile和MapFile失败：" + e.getMessage();
        } finally {
            try {
                if (dicomInputStream != null) {
                    dicomInputStream.close();
                }
                if (seqWriter != null) {
                    seqWriter.close();
                }
                if (mapWriter != null) {
                    mapWriter.close();
                }
                if (fs != null) {
                    fs.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }