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我正在尝试构建一个 Android 应用程序来使用 FTP 执行上传速度测试，但是使用以下代码，上传速度不会超过 1 Mbps。在同一设备上使用 FTP 客户端时，我可以获得 15 Mbps 的上传速度。有人可以帮我解决这个问题吗？

public class MultiUL extends Thread{

private String id="hhhhh0001";
private int bufferSize=32768;

public void run() {
    FTPClient ftp = new FTPClient();
    try {       
        ftp.connect(MPSharkVar.Server,21); // Using port no=21
        ftp.login(MPSharkVar.FTPUser, MPSharkVar.FTPPwd);
        ftp.setFileType(FTP.BINARY_FILE_TYPE);
        ftp.enterLocalPassiveMode();
    } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }     
    uploadWork(ftp, id);           
    try {
        ftp.disconnect();
    } 
    catch (Exception ex) 
    {    
    }
}

private void uploadWork(FTPClient ftp, String id) {

    byte[] buffer = new byte[bufferSize];
    for (int i = 0; i < bufferSize; i++) {
        buffer[i] = 'F';
    }
    OutputStream os = null;
    BufferedOutputStream bos = null;
    long start = System.currentTimeMillis();
    long end = start;
    try {
        ftp.changeWorkingDirectory("/upload");
        os = ftp.storeFileStream(id);
        bos = new BufferedOutputStream(os);
        start = System.currentTimeMillis();
        end = start;
        while (((end - start) <= MPSharkVar.TestDur)) {
            bos.write(buffer, 0, buffer.length);

            end = System.currentTimeMillis();

        }
        } catch (Exception ex) {
            end = System.currentTimeMillis();
        } finally {

                try {
                    bos.flush();
                    bos.close();
                    os.close();      
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

        }
    }

}
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