Apache Commons Net FTPClient and listFiles()

Vladimir Mihailenco picture Vladimir Mihailenco · Apr 26, 2010 · Viewed 39.9k times · Source

Can anyone explain me what's wrong with the following code? I tried different hosts, FTPClientConfigs, it's properly accessible via firefox/filezilla... The problem is I always get empty filelist without any exceptions (files.length == 0). I use commons-net-2.1.jar installed with Maven.

    FTPClientConfig config = new FTPClientConfig(FTPClientConfig.SYST_L8);

    FTPClient client = new FTPClient();
    client.configure(config);

    client.connect("c64.rulez.org");
    client.login("anonymous", "anonymous");
    client.enterRemotePassiveMode();

    FTPFile[] files = client.listFiles();
    Assert.assertTrue(files.length > 0);

Answer

PapaFreud picture PapaFreud · Mar 3, 2011

Found it!

The thing is you want to enter passive mode after you connect, but before you log in. Your code returns nothing for me, but this works for me:

import org.apache.commons.net.ftp.FTPClient;
import java.io.IOException;
import org.apache.commons.net.ftp.FTPFile;

public class BasicFTP {

    public static void main(String[] args) throws IOException {
        FTPClient client = new FTPClient();
        client.connect("c64.rulez.org");
        client.enterLocalPassiveMode();
        client.login("anonymous", "");
        FTPFile[] files = client.listFiles("/pub");
        for (FTPFile file : files) {
            System.out.println(file.getName());
        }
    }
}

Gives me this output:

c128
c64
c64.hu
incoming
plus4