一个很简单的监控软件，主要功能就是不断的PING你需要的主机，断网时或者延时时间太大的话会主动发出提示或者邮件。主要涉及多线程，委托等知识点。-Host a simple monitoring software, the main function is to keep the PING you need, when broken network or delay time will be too large, or unsolicited e-mail alerts. Mainly relat