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      工作需要使用了org.apache.commons.net.ftp.FTPClient来操作FTP，记录一下心得。

      这个类封装的很完善，使用起来也很简单，只是在使用retrieveFileStream的时候碰到了一点小问题，就是不知道怎么完成传输状态，尝试发送abor指令也不行。在咨询了bianbian和查看了源代码之后看到这一段说明以后解决问题： 

/* 
* You must close the InputStream when you 
* finish reading from it. The InputStream itself will take care of 
* closing the parent data connection socket upon being closed. To 
* finalize the file transfer you must call 
* {@link #completePendingCommand completePendingCommand } and 
* check its return value to verify success. 
*/

代码如下：

import org.apache.commons.net.ftp.FTPClient; import java.io.IOException; 
import java.io.InputStream; 
import java.net.SocketException; public class TestFTP { public static void main(String[] args) { try { FTPClient ftp = new FTPClient(); // initialize ftp connection String remotefile = "test.xml"; InputStream is = null; is = ftp.retrieveFileStream(remotefile); if (is != null) { is.close(); } if (!ftp.completePendingCommand()) { ftp.logout(); ftp.disconnect(); } // continue } catch (SocketException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } 
}

博文来源：http://blog.sunshow.net/2007/03/ftpclient-retrievefilestream-usage/