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;

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) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}