代码如下，
- Java code
public class FTPTransferTask extends FTPTransferAstnTask { /** */ private FTPClient mFTPClient = null; private long lRemoteSize = 0L; private long size= 0L; private OutputStream out = null; private InputStream in = null; private byte[] bytes; private int c; /** * @see net.abachar.androftp.transfers.manager.TransferTask#doInBackgroundDownload() */ public void doInBackgroundDownload() { new FTPTransferAstnTask() { @Override protected Object doInBackground(Object... params) { // TODO Auto-generated method stub try { // Create client if (mFTPClient == null) { createFTPClient(); } if (!mFTPClient.isConnected()) { connect(); } if (!mFTPClient.login("lgw150", "123456yi")) {// mFTPClient.login("lgw150", "123456yi"); } // if (binaryTransfer) { mFTPClient.setFileType(FTP.BINARY_FILE_TYPE); // } mFTPClient.enterLocalPassiveMode(); if (!mFTPClient.printWorkingDirectory().equals("/lgw150/Web")) { mFTPClient.changeWorkingDirectory("/lgw150/Web"); } FileOutputStream fos = new FileOutputStream(Environment .getExternalStorageDirectory().toString() + "/classpath123.txt"); CountingOutputStream cos = new CountingOutputStream(fos) { protected void beforeWrite(int n) { super.beforeWrite(n); String remotePath = "/lgw150/Web/"; try { mFTPClient.login("lgw150", "123456yi"); FTPFile[] files = mFTPClient.listFiles(remotePath); for (int i = 0; i < files.length; i++) { FTPFile file = files[i]; String fileName = file.getName(); Log.e("fileNames", file.getName()); if (fileName.equals("classpath.txt")) { size = file.getSize(); } } Log.e("remotefilesize", lRemoteSize + "" + "||" + getCount() + "size" + size + "|" + "files.length" + files.length + "||" + "n:" + n); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } int p = Math.round((getCount() * 100) / size); Log.i("DOWN", "the progress" + " : -> " + p + "%"); } }; [color=#FF0000] mFTPClient.retrieveFile("classpath.txt", cos)[/color];//代码在这边就走不下去 Log.e("go here2?", "yes"); mFTPClient.logout(); cos.close(); fos.close(); Log.e("go here3?", "yes"); } catch (SocketException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if ((mFTPClient == null) && mFTPClient.isConnected()) { try { mFTPClient.disconnect(); } catch (IOException e) { e.printStackTrace(); } } } return super.doInBackground(params); } @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); } @Override protected void onPostExecute(Object result) { // TODO Auto-generated method stub super.onPostExecute(result); } }.execute(null); } public void createFTPClient() { mFTPClient = new FTPClient(); mFTPClient.addProtocolCommandListener(new PrintCommandListener( new PrintWriter(System.out))); } /** * @throws IOException * @throws SocketException * */ public void connect() throws SocketException, IOException { // FTPFileManager fileManager = (FTPFileManager) // MainApplication.getInstance().getServerFileManager(); // Connect to server mFTPClient.connect("lgw150.web-211.com", 21); // Check the reply code to verify success. int reply = mFTPClient.getReplyCode(); Log.e("the reply ", reply+""); if (!FTPReply.isPositiveCompletion(reply)) { return; } }}