Servlet mapping configuration

1. Configure the web.xml file

First <url-pattern>intercept the request, then look for the same name as <servlet-mapping>in , and then jump to his<servlet-name><servlet-><servlet-class>

2. Annotation method (Servlet3.0)

It is no longer necessary to configure in web.xml, just write the following code at the beginning of the servlet.
@WebServlet(name = "xxx（一般系统自动生成）",urlPatterns = {"/xxx"})