mvc request life cycle

) configuration in the. web. xml file:(3). Write a servlet to test:Package Cn.itheima.servlet;import Java.io.ioexception;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;public class FilterDemo1 extends HttpServlet {public void doget ( HttpServletRequest request, HttpServletResponse response) throws Servletexception, IOException {respo

invokes the event handler to be raised. This model supports true event-driven behavior, which greatly broadens the richness of the user interface that can be combined and reduces the complexity of the code needed to support it. ASP.net replaces the linear processing model of ASP by simulating the behavior of event-driven model. Provides an ASP.net page framework to implicitly establish an association of event and event handlers for you. With this page framework, you can easily create a user int

Suppose you already have a Session factory class: Session = sessionmaker(bind=some_engine) Then the life cycle of the session instance can be: Shortest mode-Create a new session per request, close when you're done@contextmanagerdef get_session_scope(): try: s = Session() yield s s.commit() except: s.rollback() finally:

Various stages of the servlet life cycle 1, creating objects Creating an object is created only when the user accesses the Web server for the first time, and the Servlet object already exists for the second or more times, so it is no longer created. Object creation Principle: When a user accesses the Web server for the first time, the server passes the URL address entered by the user. Parsing the

and a session: 1, the cookie data stored in the customer's browser, session data on the server. 2, cookies are not very safe, others can analyze stored in the local cookies and cookie spoofing, taking into account the security should use session. 3, session will be stored in a certain period of time on the server. When the access is increased, the performance of your server is compared, and cookies should be used to mitigate server performance. 4, a single cookie can not save more than 4K of da

passed back to the server when the form is submitted. Like what:In fact, this technique can be simply replaced by applying URL rewriting to the action. The difference between a cookie and a session: 1, the cookie data stored in the customer's browser, session data on the server. 2, cookies are not very safe, others can analyze stored in the local cookies and cookie spoofingConsider that security should use session. 3, session will be stored in a certain period of time on the server. When the vi

, and when the view's nib file exists, the initialization is done in Viewdidload.The view has not been generated at loadview time, and when the view is Viewdidload, it has been generated. The Loadview method is used to create a new view. Loadview will only be called once, and Viewdidload may be called multiple times.When a memory warning is present, the system default action checks that the current view controller's view is still in use, and if it is not in use and the controller implements the

HttpApplication and handed the box context to it, and then the work list as a performance assessment list also to him. 4, waiting to return the result .PS: In this process, in fact there are more detailed process, but I think that helpless and we understand the real important things, but will bring higher difficulty, so also did not write. Interested cheese can go to the Microsoft website to search for related resources.Next, the "project manager" HttpApplication to believe that we have already

The life cycle of a Servlet:Instantiate, initialize, provide services, destroy instancesAfter the Web container loads the servlet and instantiates it, the servlet life cycle begins, the container runs its Init method for the servlet initialization, the request arrives to run

Create a new lifecycle scope You can create a life cycle scope by invoking the Beginlifetimescope () method from the root container on any existing lifecycle scope. Lifecycle scopes are can be destroyed, they track the disposition of components, so make sure you always call "Dispose ()" or wrap them in a "using" statement. using (var scope = container. Beginlifetimescope ()) { //from the scope that is th

The IsReusable property is used to indicate whether the handler can be stored in the pool for reuse when the IHttpHandlerFactory object is created IHttpHandler.Generic Handler (HttpHandler): is a special class that implements the System.Web.IHttpHandler interface. Any class that implements the IHttpHandler interface is a precondition for the target program as an external request. (Any class that does not implement this interface cannot be requested by

In the request header of the HTTP protocol, get the resource to access, find the Web. XML file to find the corresponding serveletthe life cycle of SevletServletwhen first accessed, the server creates aServletobject that will be called directly after the object is created.Initmethod to initialize, the object that is created will always reside in memory for thisSer

] DidfinishlaunchingwithoptionsLIFECYCLE[40428:11303] ApplicationdidbecomeactivePress the Home buttonLIFECYCLE[40428:11303] ApplicationwillresignactiveLIFECYCLE[40428:11303] ApplicationdidenterbackgroundDouble-click the Home button and then open the programLIFECYCLE[40428:11303] ApplicationwillenterforegroundLIFECYCLE[40428:11303] Applicationdidbecomeactive2. Application life cycle 2.1, loading applications

] Didfinishlaunchingwithoptions LIFECYCLE[40428:11303] ApplicationdidbecomeactivePress the Home buttonLIFECYCLE[40428:11303] applicationwillresignactive lifecycle[40428:11303] ApplicationdidenterbackgroundDouble-click the Home button and then open the programLIFECYCLE[40428:11303] Applicationwillenterforeground lifecycle[40428:11303] Applicationdidbecomeactive2. Application life cycle 2.1, loading applicati