这是一个GUI聊天小程序。客户端与服务器端都可以由用户输入数据向对方发送，把接收数据部分放在线程中，它始终在后台运行，一旦对方发数据就显示，不影响自己发送-This is a GUI chat applet. Client and server-side data can be entered by the user to send to each other, some of the received data on the thread, it is always running in th