我有一個 Spring Boot 應(yīng)用程序。用戶可以登錄我的應(yīng)用程序并上傳文件。用戶的所有文件都存儲在Google Cloud Storage中?，F(xiàn)在，我希望用戶能夠下載他們的文件。所以，我必須從云存儲下載文件。我不知道我的控制器應(yīng)該是什么樣子。使用我當(dāng)前的代碼，我得到一個空文件。上傳已經(jīng)完成，連接也正常。public static Blob downloadFile(Storage storage, String fileName){ Blob blob = storage.get(BUCKET_NAME, fileName); return blob; }@RequestMapping(value = "/downloadFileTest") @ResponseBody public void downloadFile(HttpSession session, HttpServletResponse response) { Storage storage = de.msm.msmcenter.service.cloudstorage.Authentication.getStorage(); Blob blob = de.msm.msmcenter.service.cloudstorage.Authentication.downloadFile(storage,"test.txt"); ReadChannel readChannel = blob.reader(); InputStream inputStream = Channels.newInputStream(readChannel); try { response.setContentType("application/force-download"); response.setHeader("Content-Disposition", "attachment; filename=test.txt"); IOUtils.copy(inputStream, response.getOutputStream()); response.flushBuffer(); inputStream.close(); } catch (Exception e){ e.printStackTrace(); } }我實際上希望能夠下載任何文件，而不僅僅是txt。當(dāng)用戶打開鏈接時，會下載名為 test.txt 的文件，但它是空的。
3 回答
紅顏莎娜
TA貢獻1842條經(jīng)驗 獲得超13個贊
看起來您只想授予用戶下載文件的權(quán)限。
解決方案是使用Signed URL，它可以讓您向用戶提供一個 URL 以在有限的時間內(nèi)訪問/下載對象。如果您將用戶直接重定向到該 URL，下載將立即開始。
哈士奇WWW
TA貢獻1799條經(jīng)驗 獲得超6個贊
我將代碼更改為：
public static String downloadFile(Storage storage, String fileName){
Blob blob = storage.get(BUCKET_NAME, fileName);
String PATH_TO_JSON_KEY = "/your/path";
URL signedUrl = null;
try {
signedUrl = storage.signUrl(BlobInfo.newBuilder(BUCKET_NAME, fileName).build(),
1, TimeUnit.DAYS, SignUrlOption.signWith(ServiceAccountCredentials.fromStream(
new FileInputStream(PATH_TO_JSON_KEY))));
} catch (IOException e) {
e.printStackTrace();
}
return signedUrl.toString();
}
紅糖糍粑
TA貢獻1815條經(jīng)驗 獲得超6個贊
#將此行添加到 spring-boot application.properties 文件 spring.cloud.gcp.credentials.location=classpath:key.json
// read/download objects
public static ResponseEntity<byte[]> getObjectFromGCP(String yourfileName) throws IOException {
String objectNameWithLocation ="your file location with file name in GCP bucket";
//create your storage object with your credentials
Credentials credentials = GoogleCredentials.fromStream(new
ClassPathResource("key.json").getInputStream());
Storage storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();
BlobId blobId = BlobId.of(bucketName, objectNameWithLocation);
Blob blob = storage.get(blobId);
return ResponseEntity.ok().contentType(MediaType.valueOf(FileTypeMap.getDefaultFileTypeMap().getContentType(yourfileName)))
.body(blob.getContent(BlobSourceOption.generationMatch()));
}
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