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copied!<p>If your ftp server supports XCRC command it could be possible to compare checksum (CRC32) of local and remote file. You could iterate all files in the folder and compare its crc with local one.</p> <pre><code>import java.io.File; import java.io.IOException; import java.net.SocketException; import java.util.Scanner; import org.apache.commons.io.FileUtils; import org.apache.commons.net.ftp.FTPClient; public class DownloadFile { private FTPClient client = new FTPClient(); public void connect() throws SocketException, IOException { client.connect("127.0.0.1"); client.login("user", "password"); } public boolean hasXCRCSupport() throws IOException { client.sendCommand("feat"); String response = client.getReplyString(); Scanner scanner = new Scanner(response); while(scanner.hasNextLine()) { String line = scanner.nextLine(); if(line.contains("XCRC")) { return true; } } return false; } public boolean isSameFile() throws IOException { if(hasXCRCSupport()) { File file = new File("D:/test.txt"); String localCRC = Integer.toHexString((int) FileUtils.checksumCRC32(file)).toUpperCase(); client.sendCommand("XCRC /test.txt"); String response = client.getReplyString().trim(); System.out.println(response); if(response.endsWith(localCRC)) { return true; } } return false; } public void logout() throws IOException { client.logout(); } public static void main(String[] args) throws SocketException, IOException { DownloadFile downloadFile = new DownloadFile(); downloadFile.connect(); if(downloadFile.isSameFile()) { System.out.println("remote file is same as local"); } downloadFile.logout(); } } </code></pre>

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