在AWS S3中,ContinuationToken与StartAfter都是用于分页查询的参数,但它们有一些区别。
ContinuationToken是用于在多次请求之间传递的令牌,以获取下一页的结果。当使用ListObjectsV2 API时,如果结果集超过API的最大返回数量(默认为1000个),则会返回一个ContinuationToken。您可以将此ContinuationToken作为参数传递给下一个请求,以获取下一页的结果。以下是使用ContinuationToken的示例代码:
import boto3
s3 = boto3.client('s3')
def list_objects(bucket_name):
response = s3.list_objects_v2(Bucket=bucket_name, MaxKeys=1000)
objects = response['Contents']
while 'NextContinuationToken' in response:
continuation_token = response['NextContinuationToken']
response = s3.list_objects_v2(Bucket=bucket_name, MaxKeys=1000, ContinuationToken=continuation_token)
objects.extend(response['Contents'])
return objects
StartAfter参数是用于指定从哪个对象之后开始返回结果。与ContinuationToken不同,StartAfter参数是直接指定对象的标识符。在使用ListObjectsV2 API时,您可以通过StartAfter参数来获取指定对象之后的结果。以下是使用StartAfter参数的示例代码:
import boto3
s3 = boto3.client('s3')
def list_objects(bucket_name, start_after):
response = s3.list_objects_v2(Bucket=bucket_name, MaxKeys=1000, StartAfter=start_after)
objects = response['Contents']
while 'NextContinuationToken' in response:
continuation_token = response['NextContinuationToken']
response = s3.list_objects_v2(Bucket=bucket_name, MaxKeys=1000, ContinuationToken=continuation_token)
objects.extend(response['Contents'])
return objects
总结: