1）Java SDK：
Date expiration = new Date(new Date().getTime() + 3600 1000);// 生成URL
URL url = client.generatePresignedUrl(bucketName, key, expiration);
2）PHP SDK：
$signedUrl = $ossClient->signUrl($bucket, $object, $timeout);
3）Python SDK：在URL中实现签名，必须至少包含Signature，Expires，OSSAccessKeyId三个参数
h = hmac.new("OtxrzxIsfpFjA7SwPzILwy8Bw21TLhquhboDYROV",
"GET\n\n\n1141889120\n/oss-example/oss-api.pdf",
sha)
urllib.quote_plus (base64.encodestring(h.digest()).strip())
或者
auth = oss2.Auth(‘您的AccessKeyId’, ‘您的AccessKeySecret’)
bucket = oss2.Bucket(auth, ‘您的Endpoint’, ‘您的Bucket名’)
print(bucket.sign_url(‘GET’, ‘object-in-bucket.txt’, 60))
4）Android SDK：
String url = oss.presignConstrainedObjectURL("<bucketName>", "<objectKey>", 30 60);
5）iOS SDK：
NSString constrainURL = nil;// sign constrain url
OSSTask task = [client presignConstrainURLWithBucketName:@"<bucket name>"
withObjectKey:@"<object key>"
withExpirationInterval: 30 * 60];
if (!task.error) {
constrainURL = task.result;
} else {
NSLog(@"error: %@", task.error);
}
6）osscmd：
signurl(sign) oss://bucket/object —timeout=[timeout_seconds]
SDK的具体代码可以参考如下链接：http://docs.aliyun.com/?spm=5176.383338.201.62.MwuAaz#/oss/sdk/java-sdk&preface
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