Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
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
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 theisConnected()methods of the JDK classes don’t do anything beyond (1).