[Java Interview] Talk about your understanding of Spring MVC

A fan who has worked for 7 years, he said that the Spring content was well prepared before the interview.

And all kinds of interview questions have also been brushed. As a result, during the interview, the interviewer asked: "Tell me about your understanding of Spring MVC".

This question can't be solved for him at once. It's the kind of suddenly who doesn't know how to organize the language, and finally failed the interview because the answers were confusing.

ok, for this question, let's take a look at the answers of ordinary people and experts.

Ordinary people:

Spring MVC it is an MVC framework.

Web applications can be developed using Spring MVC

Expert:

OK, I will answer this question in several ways.

First of all, Spring MVC is a module in the Spring Framework ecosystem. It is a web framework built on the basis of Servlet and designed using the MVC pattern.

The main purpose is to simplify the Web development method under the traditional Servlet+JSP mode.

Secondly, the overall architecture design of Spring MVC has enhanced and extended the MVC architecture pattern in Java Web, mainly in several aspects.

1. The Controller controller in the traditional MVC framework is split and divided into the front-end controller DispatcherServlet and the back-end controller Controller.
2. Split the Model model into the business layer Service and the data access layer Repository.
3. In the view layer, different views can be supported, such as Freemark, velocity, JSP and so on.

Therefore, Spring MVC is naturally designed for the MVC pattern, so it will be more convenient and flexible to develop MVC applications.

The specific workflow of Spring MVC is that the browser request will first pass through the core controller DispatcherServlet in Spring MVC, which is responsible for distributing the request to the corresponding Controller.

After processing the business logic in the Controller, return to ModeAndView.

Then DispatcherServlet looks for one or more ViewResolver view resolvers, finds the view specified by ModeAndView, and displays the data to the client.

The above is my understanding of Spring MVC.

Summarize

I have trained more than 3W Java architects, and I found that their understanding of technology is only at the use level,

There is no in-depth thinking about the underlying design of these technical frameworks, which led them to work 5 years later.

When you want to change the architecture, you lack top-level design capabilities and abstract thinking.

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