This example demonstrate how to retrieve list of files from FTP server.

package org.kodejava.example.commons.net;

import org.apache.commons.io.FileUtils;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;

import java.io.IOException;

public class FTPListDemo {
    public static void main(String[] args) {
        FTPClient client = new FTPClient();

        try {
            client.connect("ftp.example.org");
            client.login("admin", "admin123**");

            // Obtain a list of filenames in the current working
            // directory. When no file found an empty array will 
            // be returned.
            String[] names = client.listNames();
            for (String name : names) {
                System.out.println("Name = " + name);
            }

            FTPFile[] ftpFiles = client.listFiles();
            for (FTPFile ftpFile : ftpFiles) {
                // Check if FTPFile is a regular file
                if (ftpFile.getType() == FTPFile.FILE_TYPE) {
                    System.out.println("FTPFile: " + ftpFile.getName() +
                            "; " + FileUtils.byteCountToDisplaySize(
                            ftpFile.getSize()));
                }
            }
            client.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                client.disconnect();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Here is the example result of our code:

Name = .
Name = ..
Name = .data
Name = example.html
Name = Touch.dat
FTPFile: .data; 1 KB
FTPFile: examples.html; 1 bytes
FTPFile: Touch.dat; 0 bytes

Maven Dependencies

<dependency>
    <groupId>commons-net</groupId>
    <artifactId>commons-net</artifactId>
    <version>3.4</version>
</dependency>

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Wayan Saryada

A programmer, runner, recreational diver, currently living in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, JPA, etc. If you need help on Java programming you can hire me on Fiverr.

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