1、安装新建tomcat
https://blog.csdn.net/SmartDemo/article/details/104609358/
排错：
1. 配置tomcat得时候deployment里application context里用/
2. tomcat在idea里错误信息为乱码
https://blog.csdn.net/u012611878/article/details/80723491
https://www.cnblogs.com/shej123/p/10312806.html