Spring Web Common Interview questions

First, the Web container initialization process

First initialize the listener, then filter, and then the servlet.

Ii. IOC container relationship in Spring MVC project

When the Web container starts, it notifies Contextloaderlistener to initialize the root IOC container, which defaults to the Webapplicationcontext instance and stores the Bean object in addition to the Web layer. Then Dispatcherservlet initializes the WEBMVC context and establishes its own IOC container as a sub-container of the root IOC container.

Third, the working process of Dispatherservlet

Process
1, the user sends the request to the front controller Dispatcherservlet
2. Dispatcherservlet received a request to call the Handlermapping processor mapper.
3. The processor mapper finds the specific processor, generates the processor object and the processor interceptor (if any) is returned to Dispatcherservlet.
4. Dispatcherservlet Call Handleradapter Processor Adapter
5, Handleradapter through the adaptation of the call to the specific processor (controller, also known as the back-end controller).
6, controller execution completed return Modelandview
7, Handleradapter the controller execution results Modelandview returned to Dispatcherservlet
8. Dispatcherservlet Pass Modelandview to Viewreslover view parser
9, Viewreslover after parsing return to the specific view
10. Dispatcherservlet the rendered view based on the view (populate the model data into the view).
11. Dispatcherservlet Response User Four, Spring MVC design Advantages

Five, the main difference between SPRINGMVC and Struts2?

The entrance to the ① Springmvc is a servlet, the front-end controller, and the struts2 entry is a filter filter. ②Springmvc is based on method development, the transfer parameters are through the method parameter, can be designed as a single case or multiple examples (recommended singleton ),Struts2 is based on class development, passing parameters are through the properties of the class, can only be designed as a number of examples.
③struts uses value stacks to store request and response data, and access data through OGNL, SPRINGMVC through the parameter parser is to parse the request object content into a method parameter, to encapsulate the response data and the page into Modelandview the object, and finally transmits the model data to the page through the request object. The JSP view parser uses Jstl by default .

SPRINGMVC Summary and some questions during the interview.

SPRINGMVC Start-up process detailed

Spring Web Common Interview questions