gradle构建项目

参见：https://blog.csdn.net/zxs9999/article/details/113511447 有常见的错误解决方法

https://www.cnblogs.com/wfdespace/p/12869277.html

https://www.cnblogs.com/H-BolinBlog/p/9047561.html  打包成war

https://blog.csdn.net/yangsnow_rain_wind/article/details/79551157  gradle编译成war放到tomcat中运行