FakeFtpServer

FakeFtpServer provides a high-level abstraction for an FTP Server and is suitable for most testing and simulation scenarios. You define a filesystem (internal, 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.

FakeFtpServer processes FTP client requests and responds with reply codes and reply messages consistent with its configuration and the contents of its internal filesystem, including file and directory permissions, if they have been configured.

FakeFtpServer can be fully configured programmatically or within a Spring Framework or other dependency-injection container.

See the FakeFtpServer Features and Limitations page for more information on which features and scenarios are supported.

StubFtpServer

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.

StubFtpServer works out of the box with reasonable defaults, but can be fully configured programmatically or within a Spring Framework or other dependency-injection container.

See the StubFtpServer Features and Limitations page for more information on which features and scenarios are supported.

So, Which One Should I Use?

In general, if your testing and simulation needs are pretty straightforward, then using FakeFtpServer is probably the best choice. See the FakeFtpServer Features and Limitations page for more information on which features and scenarios are supported.

Some reasons to use StubFtpServer include:

• If you need to simulate an FTP server scenario not supported by FakeFtpServer.
• You want to test a very specific and/or limited FTP scenario. In this case, the setup of the StubFtpServer might be simpler -- you don't have to setup fake files and directories and user accounts.
• You are more comfortable with configuring and using the lower-level FTP server command reply codes and behavior.