Shulou(Shulou.com)06/01 Report--

The life cycle of Servlet is divided into five phases: loading, creating, initializing, processing customer requests, and unloading.

(1) load: the container uses the file corresponding to the servlet class to load servlet through the class loader

(2) create: create a servlet instance object by calling the servlet constructor

(3) initialization: initialization is done by calling the init () method of Servlet, which is called before the Servlet has been created but before the service is provided to the client.

(4) handle customer requests: after the Servlet is created, the request can be processed. When there is a new client request, the Web container will create a new thread to process the request. Then call the Servlet's

The Service () method responds to the client request (the Service method calls doGet () and doPost () based on the method property of the request)

(5) Uninstall: before uninstalling Servlet, the container needs to call the destroy () method to let Servlet release the resources it occupies.

Servlet is the responsibility of the Servlet container to load the Servlet class, create the Servlet object and instantiate it, then call the init method of Servlet for initialization, and then call the Service method. Instantiation is different from initialization.

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