The Apache FtpServer is a 100% pure Java FTP server. It’s designed to be a complete and portable FTP server engine solution based on currently available open protocols. FtpServer can be run standalone as a Windows service or Unix/Linux daemon, or embedded into a Java application. We also provide support for integration within Spring applications and provide our releases as OSGi bundles.
The default network support is based on Apache MINA, a high performance asynchronous IO library. Using MINA, FtpServer can scale to a large number of concurrent users.
It is also an FTP application platform. We have developed a Java API to let you write Java code to process FTP event notifications that we call the Ftplet API. Apache FtpServer provides an implementation of an FTP server to support this API.