如何使用Java中的FTPClient在FTP服务器中复制文件？ [英] How to copy a file in FTP server using FTPClient in Java?

问题描述

我有一个CSV文件，我需要将其复制并在同一路径中将其重命名为 。

FTP登录：

  InputStream inputStream = ftpClient.retrieveFileStream（cvs_name +。csv）; 
 ftpClient.storeFile（cvs_name2 +.csv，inputStream）; 
  

但是当我在服务器上验证文件时，它是空的。我如何复制文件并重命名它？

解决方案

我相信你的代码无法工作。您无法同时通过一个FTP连接下载和上传文件。

您有两种选择：

• 完全下载文件（临时文件或内存）。

  
  
  

  如何将ftp服务器上的文件复制到java中同一服务器上的目录？显示to memory解决方案。注意 outputStream.toByteArray（）调用。

打开两个连接（两个 FTPClient ）并在实例之间复制文件。



  InputStream inputStream = ftpClient1。 retrieveFileStream（cvs_name +.csv）; 
 ftpClient2.storeFile（cvs_name2 +.csv，inputStream）; 
  

I have a CSV file, and I need to copy it and rename it in the same path.

I tried this after the FTP login:

InputStream inputStream = ftpClient.retrieveFileStream(cvs_name +".csv");
ftpClient.storeFile(cvs_name2 + ".csv",inputStream);

But when I verify the file on the server, it's empty. How can I copy a file and rename it?

解决方案

I believe your code cannot work. You cannot download and upload a file over a single FTP connection at the same time.

You have two options:

• Download the file completely first (to a temporary file or to a memory).

  The accepted answer to How to copy a file on the ftp server to a directory on the same server in java? shows the "to memory" solution. Note the outputStream.toByteArray() call.

• Open two connections (two instances of the FTPClient) and copy the file between the instances.

  InputStream inputStream = ftpClient1.retrieveFileStream(cvs_name + ".csv");
  ftpClient2.storeFile(cvs_name2 + ".csv", inputStream);
  

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