CODEWITHSUNDEEP
javaftp-clientapache-commons-net
Ariyan
Ariyan

Reputation: 15158

FTPClient's isAvailable and is Connected return true but storeFileStream returns null

I'm uploading lots of files (about 2000) using Commons-net FTPClient.
I'm checking connection before each upload using isAvailable() & isConnected() methods and reconnect if connection closed.
after uploading some files (variable) storeFileStream returns null (that means "data connection cannot be opened" as javadoc) while isAvailable() & isConnected() both are true !!
What is the problem?
How can I check data connection availability?

Thanks

Upvotes: 1

Views: 3035

Answers (2)

pm_labs
pm_labs

Reputation: 1145

You can also try calling getReplyCode().

Returns the integer value of the reply code of the last FTP reply. You will usually only use this method after you connect to the FTP server to check that the connection was successful since connect is of type void.

You can check what those codes mean from this Wikipedia link

Upvotes: 0

user207421
user207421

Reputation: 310850

How can I check data connection availability?

Try to use it. There is no 'dial tone' in TCP, so methods with names like isConnected() can't do anything more than tell you (1) whether you have ever connected, and, if you're lucky, (2) whether you have subsequently closed the connection or encountered an I/O error on it. I'm not familiar with the API you mention but the isConnected() methods of the JDK classes don't do anything beyond (1).

Upvotes: 3

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