Java后端开启WebSocket，Tomcat实现

h5 websocket

https://www.runoob.com/html/html5-websocket.html

参考文章

https://www.cnblogs.com/xdp-gacl/p/5193279.html

我的项目，h5与java 通信

https://gitee.com/lishuoboy/lishuoboy-websocket