Check whether the path exists on server or not in Java

问题

I am creating a Java program in which I am uploading file to server on a particular path. I am using jSch for sftp.

So, before uploading the file, I want to check if the given directory exists on server or not.

if(path exists)
    //upload file to the location
else
    //create the directory and then upload the file.

How do I check the path exists or not?

Note: I am executing the code on a client that will check for the existence of a remote directory on a server. So please don't suggest File.exists().

回答1:

Reading the Documentation for ChannelSftp it would appear you can just lstat the directory:

SftpATTRS attrs = channelSftp.lstat(path);

If that throws an exception, it doesn't exist. You can then use channelSftp.mkdir(path) to create it.

回答2:

I am not familiar with this library, but from this example code: http://www.jcraft.com/jsch/examples/Sftp.java.html it looks like you can use

ChannelSftp c = ..;
c.ls('<path>')

to retrieve the file, this should tell you whether it exists or not.

来源：https://stackoverflow.com/questions/21276775/check-whether-the-path-exists-on-server-or-not-in-java