**How to Transfer Files between Android Apps and FTP Servers Using Apache Commons FTP?**

Android FTP Library

Android applications often require the ability to transfer files to and from FTP servers. While numerous client apps exist, finding standalone libraries for Android can be challenging. This article provides a solution to this problem.

Apache Commons FTP

For Android, Apache Commons FTP is an excellent choice. This library offers a comprehensive set of classes for working with FTP servers. It supports both synchronous and asynchronous operations, making it suitable for a wide range of scenarios.

Sample Code

The following code demonstrates how to use Apache Commons FTP to download a file from an FTP server:

<code class="java">FTPClient ftpClient = new FTPClient();
ftpClient.connect(InetAddress.getByName(server));
ftpClient.login(user, password);
ftpClient.changeWorkingDirectory(serverRoad);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

BufferedInputStream buffIn = null;
buffIn = new BufferedInputStream(new FileInputStream(file));
ftpClient.enterLocalPassiveMode();
ftpClient.storeFile("test.txt", buffIn);
buffIn.close();
ftpClient.logout();
ftpClient.disconnect();</code>

In this code, you first create an FTPClient instance and establish a connection to the FTP server. You then authenticate using a username and password. Next, you change the working directory on the server and set the file type to binary.

Using a BufferedInputStream, you read the file from the local file system and store it on the FTP server using the storeFile method. Finally, you close the input stream and disconnect from the FTP server.

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