Java: Accessing a File from an FTP Server

Question

So I have this FTP server with a bunch of folders and files inside.

My program needs to access this server, read all of the files, and display their data.

For de

Answer 1

File objects cannot handle an FTP connection, you need to use a URLConnection:

URL url = new URL ("ftp://username:password@www.superland.example/server");
URLConnection urlc = url.openConnection();
InputStream is = urlc.getInputStream();
...

Consider as an alternative FTPClient from Apache Commons Net which has support for many protocols. Here is an FTP list files example.

Answer 2

if you use URI with file you can use your code but , but when you want to use ftp so you need to this kind of code; code list the name of the files under your ftp server

import java.net.*;
import java.io.*;

public class URLConnectionReader {
    public static void main(String[] args) throws Exception {
        URL url = new URL("ftp://username:password@www.superland.example/server");
        URLConnection con = url.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                                    con.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    }
}

EDITED Demo Code Belongs to Codejava

package net.codejava.ftp;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

public class FtpUrlListing {

    public static void main(String[] args) {
        String ftpUrl = "ftp://%s:%s@%s/%s;type=d";
        String host = "www.myserver.com";
        String user = "tom";
        String pass = "secret";
        String dirPath = "/projects/java";

        ftpUrl = String.format(ftpUrl, user, pass, host, dirPath);
        System.out.println("URL: " + ftpUrl);

        try {
            URL url = new URL(ftpUrl);
            URLConnection conn = url.openConnection();
            InputStream inputStream = conn.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

            String line = null;
            System.out.println("--- START ---");
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            System.out.println("--- END ---");

            inputStream.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}