open source java FTP client library [duplicate]

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What Java 开发者_开发问答FTP client library should I use?

I am looking for open source FTP client library which exposes APIsI.I will be calling these APis from my java program .The APIs should return proper codes indicating whether the while was successfully downloaded etc.In case or error it should return proper error codes.

Please suggest.

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Have a look at Apache Commons Net, http://commons.apache.org/net/

It implements many internet protocols, among them is ftp.