我有一个 S3 存储桶,里面有文件。我可以成功下载并在我的应用程序上显示该文件。
但是我想知道该文件是否是最新的。使用 Firefox S3 扩展,我可以看到在存储桶文件名中,文件大小和上传时间都保存到 S3。上传时间的一个例子是10/10/2012 11:35 PM
获取我使用的网址
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
// Set the content type so that the browser will treat the URL as an image.
S3ResponseHeaderOverrides *override = [[S3ResponseHeaderOverrides alloc] init];
override.contentType = @" ";
// Request a pre-signed URL to picture that has been uplaoded.
S3GetPreSignedURLRequest *gpsur = [[S3GetPreSignedURLRequest alloc] init];
gpsur.key = _fileName;
gpsur.bucket = [Constants pictureBucket];
gpsur.expires = [NSDate dateWithTimeIntervalSinceNow:(NSTimeInterval) 3600]; // Added an hour's worth of seconds to the current time.
gpsur.responseHeaderOverrides = override;
// Get the URL
NSError *error;
NSURL *url = [self.s3 getPreSignedURL:gpsur error:&error];
如何获取 Amazon S3 上文件的上传日期?
编辑::::答案
好的,感谢用以下方法回答我可以得到日期
S3GetObjectMetadataRequest *getMetadataRequest = [[S3GetObjectMetadataRequest alloc] initWithKey:_fileName withBucket:[Constants pictureBucket]];
S3GetObjectMetadataResponse *getMetadataResponse = [self.s3 getObjectMetadata:getMetadataRequest];
NSString *fileLastModifiedDate = [[NSString alloc] init];
fileLastModifiedDate = [NSString stringWithFormat:@"%@",getMetadataResponse.lastModified];
NSLog(@"Last Modified date %@",fileLastModifiedDate);