如何检查AWS S3bucket中是否存在资源

我有一个AWS S3存储桶，我有多个文件夹。

s3 = AWS::S3.new bucket = s3.buckets['test'] bucket.exists? => true 

假设我有一个名为demo/index.html的资源，我将如何检查此资源中是否存在此资源？

可能是我的问题太简单了，但我无法为此找到合适的答案。 任何帮助表示赞赏。

Answer 1

#exists？ ⇒布尔值

如果对象存在于S3中，则返回true。

 # new object, does not exist yet obj = bucket.objects["my-text-object"] # no instruction file present begin bucket.objects['my-text-object.instruction'].exists? #=> false rescue # exists? can raise an error `Aws::S3::Errors::Forbidden` end # store the encryption materials in the instruction file # instead of obj#metadata obj.write("MY TEXT", :encryption_key => MY_KEY, :encryption_materials_location => :instruction_file) begin bucket.objects['my-text-object.instruction'].exists? #=> true rescue # exists? can raise an error `Aws::S3::Errors::Forbidden` end 

http://docs.aws.amazon.com/AWSRubySDK/latest/AWS/S3/S3Object.html#exists%3F-instance_method