我正在使用Apache Commons FTPClient上传大文件，但是传输速度只是使用WinSCP通过FTP传输速度的一小部分。如何加快转移速度？
public boolean upload(String host, String user, String password, String directory,
String sourcePath, String filename) throws IOException{
FTPClient client = new FTPClient();
FileInputStream fis = null;
try {
client.connect(host);
client.login(user, password);
client.setControlKeepAliveTimeout(500);
logger.info("Uploading " + sourcePath);
fis = new FileInputStream(sourcePath);
//
// Store file to server
//
client.changeWorkingDirectory(directory);
client.setFileType(FTP.BINARY_FILE_TYPE);
client.storeFile(filename, fis);
client.logout();
return true;
} catch (IOException e) {
logger.error( "Error uploading " + filename, e );
throw e;
} finally {
try {
if (fis != null) {
fis.close();
}
client.disconnect();
} catch (IOException e) {
logger.error("Error!", e);
}
}
}
