head first servlets and jsp

Chapter OutlineThe difference between 1.servletConfig and ServletContextThe difference between 1.servletConfig and ServletContext From the deployment point of view, ServletConfig is in the servlet, and ServletContext is under Web-app From the code,Getservletcontext (). Getinitparameter ("foo"); Getservletconfig (). Getinitparameter ("foo") From a usable point of view, ServletConfig is available only to the corresponding servlet, while ServletContext is useful for all

When I was visiting a bookstore, I accidentally found this book amazing. So I bought it and showed it to the students. After a few months, I am idle and ready to look at the system. Although I have made two struts, spring, and hibernate projects, I feel that the knowledge is not very systematic. 1. servlet does not have the main () method, and they are controlled by another Java application called "Container: HTTP request -----> Web Server ----- (Servlet request) -----> Servlet container (create

, the service method is called first, and then, depending on the requested method type, the call Doget or the Dopost method is called, and then after all the execution of the request, the Destroy method is called to Kill (GC) out the Servlet object(3) ServletConfig and SERVLETCONTENXTEach servlet has only one servletconfig, and then the initialization parameters configured in the servlet in the DD, ServletConfig can getWhen the container invokes the servlet's init () method, it creates a unique