Android ftp 断点续传java代码示例

好的，以下是一个简单的 Android ftp 断点续传的 Java 代码示例：

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FtpUtil {
    private static final int BUFFER_SIZE = 1024 * 1024;

    public static boolean uploadFile(String host, int port, String username, String password,
                                     String remoteDir, String remoteFileName, String localFilePath) {
        FTPClient ftpClient = new FTPClient();
        boolean success = false;
        try {
            ftpClient.connect(host, port);
            ftpClient.login(username, password);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

            File localFile = new File(localFilePath);
            InputStream inputStream = new FileInputStream(localFile);
            ftpClient.changeWorkingDirectory(remoteDir);
            ftpClient.setControlEncoding("UTF-8");
            ftpClient.setBufferSize(BUFFER_SIZE);

            long remoteSize = 0;
            FTPFile[] files = ftpClient.listFiles(remoteFileName);
            if (files.length == 1) {
                remoteSize = files[0].getSize();
            }

            OutputStream outputStream = ftpClient.appendFileStream(remoteFileName);
            if (outputStream == null) {
                outputStream = ftpClient.storeFileStream(remoteFileName);
            }

            byte[] bytes = new byte[BUFFER_SIZE];
            int length;
            long step = localFile.length() / 100;
            long process = remoteSize / step;
            while ((length = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, length);
                remoteSize += length;
                long currentProcess = remoteSize / step;
                if (currentProcess > process) {
                    process = currentProcess;
                    if (process % 10 == 0) {
                        System.out.println("上传进度：" + process);
                    }
                }
            }
            outputStream.flush();
            inputStream.close();
            outputStream.close();
            success = ftpClient.completePendingCommand();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.logout();
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return success;
    }
}

希望能够帮到你！