One: Web Engineering
src is used to store the Java source code written by yourself
web is specially used to store the resource files of web projects, such as html page css file, js file waiting
web-inf is a directory protected by the server, browsers cannot directly access the contents of this directory
web.xml It is the configuration and deployment description file of the entire dynamic web project. Many web project components can be configured here. Servlet program Filter filter Listener listener Session timeout