public DownloadFileResult downloadFile(DownloadFileRequest downloadFileRequest) throws Throwable {
assertParameterNotNull(downloadFileRequest, "downloadFileRequest");
String bucketName = downloadFileRequest.getBucketName();
String key = downloadFileRequest.getKey();
assertParameterNotNull(bucketName, "bucketName");
assertParameterNotNull(key, "key");
ensureBucketNameValid(bucketName);
ensureObjectKeyValid(key);
// 没有指定本地文件，使用key作为本地文件名称
if (downloadFileRequest.getDownloadFile() == null) {
downloadFileRequest.setDownloadFile(downloadFileRequest.getKey());
}
// 开启断点续传，没有指定checkpoint文件，使用默认值
if (downloadFileRequest.isEnableCheckpoint()) {
if (downloadFileRequest.getCheckpointFile() == null
|| downloadFileRequest.getCheckpointFile().isEmpty()) {
downloadFileRequest.setCheckpointFile(downloadFileRequest.getDownloadFile() + ".dcp");
}
}
return downloadFileWithCheckpoint(downloadFileRequest);
}
private void prepare(
DownloadCheckPoint downloadCheckPoint, DownloadFileRequest downloadFileRequest)
throws IOException {
downloadCheckPoint.magic = DownloadCheckPoint.DOWNLOAD_MAGIC;
downloadCheckPoint.downloadFile = downloadFileRequest.getDownloadFile();
downloadCheckPoint.bucketName = downloadFileRequest.getBucketName();
downloadCheckPoint.objectKey = downloadFileRequest.getKey();
downloadCheckPoint.objectStat =
ObjectStat.getFileStat(
objectOperation, downloadCheckPoint.bucketName, downloadCheckPoint.objectKey);
downloadCheckPoint.downloadParts =
splitFile(downloadCheckPoint.objectStat.size, downloadFileRequest.getPartSize());
createFixedFile(downloadFileRequest.getDownloadFile(), downloadCheckPoint.objectStat.size);
}