我有一个单独的服务来管理文件和 s3 身份验证。它生成预签名的 URL,我可以在其他服务中使用它来上传(和下载)文件。
我想利用分段上传 sdk - 目前“uploadToUrl”方法似乎大部分时间都花在 getResponseCode 上,因此很难提供用户反馈。此外,在我的测试中,分段上传似乎要快得多。
理想情况下,我希望能够使用预签名 URL 而不是临时使用的 secret key /访问 key 来创建一些 AWSCredentials。这只是一个白日梦吗?
//s3 service
public URL getUrl(String bucketName, String objectKey, Date expiration, AmazonS3 s3Client, HttpMethod method, String contentType) {
GeneratePresignedUrlRequest generatePresignedUrlRequest;
generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, objectKey);
generatePresignedUrlRequest.setMethod(method);
generatePresignedUrlRequest.setExpiration(expiration);
generatePresignedUrlRequest.setContentType(contentType);
URL s = s3Client.generatePresignedUrl(generatePresignedUrlRequest);
System.out.println(String.format("Generated Presigned URL: %n %S", s.toString()));
return s;
}
//Upload service
Override
public void uploadToUrl(URL url, File file) {
HttpURLConnection connection;
try {
InputStream inputStream = new FileInputStream(file);
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("PUT");
OutputStream out =
connection.getOutputStream();
byte[] buf = new byte[1024];
int count;
int total = 0;
long fileSize = file.length();
while ((count =inputStream.read(buf)) != -1)
{
if (Thread.interrupted())
{
throw new InterruptedException();
}
out.write(buf, 0, count);
total += count;
int pctComplete = new Double(new Double(total) / new Double(fileSize) * 100).intValue();
System.out.print("\r");
System.out.print(String.format("PCT Complete: %d", pctComplete));
}
System.out.println();
out.close();
inputStream.close();
System.out.println("Finishing...");
int responseCode = connection.getResponseCode();
if (responseCode == 200) {
System.out.printf("Successfully uploaded.");
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
最佳答案
几年后,深入研究 AWS Java SDK 发现将以下内容添加到 GeneratePresignedUrlRequest
效果很好:
AmazonS3Client amazonS3Client = /* ... */;
GeneratePresignedUrlRequest request = /* ... */;
// the following are required to trigger the multipart upload API
request.addRequestParameter("uploadId", uploadIdentifier);
request.addRequestParameter("partNumber", Integer.toString(partNumber));
// the following may be optional but are recommended to validate data integrity during upload
request.putCustomRequestHeader(Headers.CONTENT_MD5, md5Hash);
request.putCustomRequestHeader(Headers.CONTENT_LENGTH, Long.toString(contentLength));
URL presignedURL = amazonS3Client.generatePresignedUrl(request);
(我还没有深入挖掘以确定是否需要 CONTENT_MD5
或 CONTENT_LENGTH
。)
关于java - S3 Java-使用预签名 URL 分段上传?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23369310/