FTPClient中 retrieveFileStream 的用法

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/