(uploadanddownload) , browsethe remote FTPsite(directorylistingincluded),create,delete,
renameandmoveremotedirectoriesandfiles.
关于FTP连接主要有如下几种方式：
The ftp4j library can connect the remote FTP server:
· Througha direct TCP/IPconnection. 一般就是直接连接了。
· ThroughaFTP proxy. FTP代理
· Tunnelling through aHTTPproxy. HTTP代理
· ThroughaSOCKS 4/4aproxy.
· ThroughaSOCKS 5 proxy.
· You can add support to otherproxies plugging your own connector, since the ftp4jconnection manager
architecture is modular.
2、主要类简介
下面根据官网的描述，将该ftp4j库的主要类简单说明下：
FTPClient类
该类封装了对FTPCommand的请求操作。例如：连接FTP服务器、进行各种各样的FTP操作(上传、下载、
删除、重命名文件 等)。基本使用流程图如下：
利用伪代码描述如下：
//1、登录至FTPp服务器mFTPClient.connect(mFTPHost, mFTPPort);//2、请求授权mFTPClient.login(mFTPUser, mFTPPassword);//3、各种FTP操作mFTPClient.upload();mFTPClient.download();//4、断开FTP连接mFTPClient.disconnect();
throws java.lang.IllegalStateException,
throws java.lang.IllegalStateException,
我们的FTP客户端主要功能为：
①、显示特定目录列表;
②、删除文件以及文件夹，下载文件;
③、上传文件。
主要代码如下：
/** * * @author jun.qin * {@link} * */public class FtpMainActivity extends Activity implements OnClickListener {private static String TAG = CopyOfFtpMainActivity.class.getName();private CmdFactory mCmdFactory;private FTPClient mFTPClient;private ExecutorService mThreadPool;@Overrideprotected void onDestroy() {mDameonRunning = false ;Thread thread = new Thread(mCmdFactory.createCmdDisConnect()) ;thread.start();//等待连接中断try {thread.join(2000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}mThreadPool.shutdownNow();super.onDestroy();}//put线程池中执行private void executeConnectRequest() {mThreadPool.execute(mCmdFactory.createCmdConnect());}private void executeDisConnectRequest() {mThreadPool.execute(mCmdFactory.createCmdDisConnect());}private void executePWDRequest() {mThreadPool.execute(mCmdFactory.createCmdPWD());}private void executeLISTRequest() {mThreadPool.execute(mCmdFactory.createCmdLIST());}//创建FtpCmd的工厂类public class CmdFactory {public FtpCmd createCmdConnect() {return new CmdConnect();}public FtpCmd createCmdDisConnect() {return new CmdDisConnect();}}//继承了Runnable接口public abstract class FtpCmd implements Runnable {public abstract void run();}//连接命令public class CmdConnect extends FtpCmd {@Overridepublic void run() {boolean errorAndRetry = false ; //根据不同的异常类型，是否重新捕获try {String[] welcome = mFTPClient.connect(mFTPHost, mFTPPort);if (welcome != null) {for (String value : welcome) {logv("connect " + value);}}mFTPClient.login(mFTPUser, mFTPPassword);mHandler.sendEmptyMessage(MSG_CMD_CONNECT_OK);}catch (IllegalStateException illegalEx) {illegalEx.printStackTrace();errorAndRetry = true ;}catch (IOException ex) {ex.printStackTrace();errorAndRetry = true ;}catch (FTPIllegalReplyException e) {e.printStackTrace();}catch (FTPException e) {e.printStackTrace();errorAndRetry = true ;}if(errorAndRetry && mDameonRunning){mHandler.sendEmptyMessageDelayed(MSG_CMD_CONNECT_FAILED, 2000);}}}public class CmdDisConnect extends FtpCmd {@Overridepublic void run() {if (mFTPClient != null) {try {mFTPClient.disconnect(true);} catch (Exception ex) {ex.printStackTrace();}}}}//下载命令public class CmdDownLoad extends AsyncTask<Void, Integer, Boolean> {@Overrideprotected Boolean doInBackground(Void… params) {try {String localPath = getParentRootPath() + File.separator+ mFileList.get(mSelectedPosistion).getName();mFTPClient.download(mFileList.get(mSelectedPosistion).getName(),new File(localPath),new DownloadFTPDataTransferListener(mFileList.get(mSelectedPosistion).getSize()));} catch (Exception ex) {ex.printStackTrace();return false;}return true;}protected void onPostExecute(Boolean result) {toast(result ? "下载成功" : "下载失败");progressDialog.dismiss();}}}
第二步：运行FTP客户端，填写FTP验证时的资料(即第一步输入信息)后，连接FTP服务器即可。如图：
上帝助自助者。
