Upload and download FTP files and folders in Java

FTP is the English abbreviation of file transfer protocol, and the Chinese abbreviation is "Text Transfer Protocol". It is used to control the two-way transmission of files on the Internet. At the same time, it is also an application (application). There are different FTP applications based on different operating systems, and all these applications follow the same protocol to transfer files. In the use of FTP, users often encounter two concepts: "download" and "Upload". The "download" file is to copy the file from the remote host to their own computer; "Upload" A file is a copy of a file from your computer to a remote host. In the Internet language, users can upload (download) files to (from) remote hosts through client programs.

First, I downloaded Serv-U and set my computer as an FTP file server for easy operation. The following codes are used after the FTP server has been created, and the relevant data of FTP connection can be written in the code.

1. Upload and download of FTP files (note the upload and download of individual files)

2. Upload and download of FTP folder (note the whole folder)

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