ftp复制文件 java,如何使用Java中的FTPClient在FTP服务器中复制文件？

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);