The execution process, life cycle of the servlet

The request and response arrows in the following diagram are reversed, and should be the client making the requests and the Web server returning the response.

The servlet life cycle phase includes initialization, loading, instantiation, servicing, and destruction.

When writing a servlet's Dopost method, you need to throw servletexcpetion and IOException exceptions.

There are 2 servlets above, where the load-on-startup priority of TestServlet2 is 1, which is higher than the priority of TestServlet1 2, so the server starts by loading TestServlet2 and then loading TestServlet1 , it resides in memory.

The execution process, life cycle of the servlet