根据SMTP协议写出的java小程序，实现邮件发送功能。适合初学计算机的学生。根据SMTP协议的要求直接处理协议的细节发送邮件，虽然比较麻烦了一些，但是对了解邮件协议的细节很有帮助的。-According to the SMTP protocol written java applets, implement email functions. Suitable for novice computer student. According to the requirements of the SM