Surprisingly, there's already basic support for FTP in some JDK flavors in the form of, we shouldn't use this class directly and it's instead possible to use the JDK's class as an abstraction. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. It's recommended to always use the latest version. paulpjoby/simple-ftp-server-java-tcp-socket. That's why we'll use MockFtpServer instead, a Fake/Stub FTP server written in Java, that provides an extensive API for easy use in JUnit tests: However especially when used in passive mode, an FTP server isn't the easiest application to run transparently inside a container if we want to make use of dynamic port mappings (which is often necessary for tests being able to be run on a shared CI server).

Nowadays, we'd normally use Docker to spin up those systems for our integration tests. This class takes care of all low level details of interacting with an FTP server and provides a convenient higher level interface. When using libraries, that are used to interact with external systems, it's often a good idea to write some additional integration tests, in order to make sure, we're using the library correctly. Direct Known Subclasses: FTPHTTPClient, FTPSClient public class FTPClient extends FTP implements Configurable FTPClient encapsulates all the functionality necessary to store and retrieve files from an FTP server. if your ftp client provides a command passive, then type that, press enter, and then try the usual commands like dir, get or put.

Simpleftp java passive