使用Java源码编写的前台与后台程序，第一次写的程序，可能不是很完善，敬请谅解！ 　　此程序是用工厂模式来写的，分为独立的前台和后台！-Foreground and background program written using the Java source code, first write the program, may not be perfect, please understand! This program is written in a factory pattern