结合老师上课讲的屏幕传输的例子，再结合在课堂上学到的多线程的知识，将多线程应用到屏幕传输的功能当中——屏幕传输一个线程，聊天一个线程。-Combination of teacher-speaking example of transmission of the screen, and then combine in the classroom to school to the knowledge of multi-threaded, multi-threaded applications wil