这个是用JAVA语言编写的FTP客户端程序，里面有详细的文档。-This is written in JAVA FTP client program, which has detailed documentation.

ftp软件，内容包括说明文档，java文件-ftp software, including documentation, java file

这里面是一个简单的socket编程说明文档，有详细的ftp客户端实现需要方法，以及一些主要的代码-That there is a simple socket programming documentation, a detailed implementation of the ftp client needs methods, and some major code