1.Idea中新建Project,新建Module(这里是01-javaweb-begin)
点击Next-->Next
File-Project Structure-Modules,点击01-javaweb-begin,选择Paths
勾选Use module compile output path
取消勾选Exclude output paths
2. 创建Web Application
File-Project Structure-Facets,点击"+",选择Web
Choose Module选择01-javaweb-begin,出现提醒:Facet...no