创建一个简单的端到端的文件传输程序，分别实现为FileSend与FileReceive两个命令行程序，实现在控制台下通过命令行将主机A上指定文件，拷贝到主机B的指定目录下(The file transfer program to create a simple end to end, respectively for FileSend and FileReceive two command line program to achieve commands through the console