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);
}
