MockFtpServer - Providing a Fake/Stub FTP Server

The MockFtpServer project provides mock/dummy FTP server implementations that can be very useful for testing of FTP client code. Two FTP Server implementations are provided, each at a different level of abstraction.

FakeFtpServer provides a higher-level abstraction for an FTP server and is suitable for most testing and simulation scenarios. You define a filesystem (virtual, in-memory) containing an arbitrary set of files and directories. These files and directories can (optionally) have associated access permissions. You also configure a set of one or more user accounts that control which users can login to the FTP server, and their home (default) directories. The user account is also used when assigning file and directory ownership for new files. See FakeFtpServer Features and Limitations.

StubFtpServer is a “stub” implementation of an FTP server. It supports the main FTP commands by implementing command handlers for each of the corresponding low-level FTP server commands (e.g. RETR, DELE, LIST). These CommandHandlers can be individually configured to return custom data or reply codes, allowing simulation of a complete range of both success and failure scenarios. The CommandHandlers can also be interrogated to verify command invocation data such as command parameters and timestamps. See StubFtpServer Features and Limitations.

See the FakeFtpServer or StubFtpServer? page for more information on deciding whether to use FakeFtpServer or StubFtpServer.

The MockFtpServer project is written in Java, and is ideally suited to testing Java code. But because communication with the FTP server is across the network using sockets, it can be used to test FTP client code written in any language.

NOTE: Starting with MockFtpServer 2.4, the Log4J dependency has been replaced with SLF4J.


The MockFtpServer project requires:

Maven Support

For projects built using Maven, MockFtpServer is now available from the Maven Central Repository. Add a dependency to your POM like this: