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This article introduces the knowledge of "what is spring". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Starting with this article, we will learn about the spring framework. Spring is undoubtedly one of the most popular open source frameworks in the Java development framework. It is precisely because spring is an open source framework that we can easily download its source code to analyze the underlying design of the spring framework. The source address of the spring framework is https://github.com/spring-projects/spring-framework. If we look at the source code of the spring framework, we will find that the underlying implementation of the spring framework is cleverly designed, and a large number of design patterns are used in the source code. If we can not only master the basic use of the spring framework, but also understand the underlying implementation, then not only when we use the spring framework handy, but also improve our understanding and use of design patterns. So as a Java developer, it is important to learn the spring framework.

Since the spring framework is so important, let's see what the spring framework can do for us.

The spring framework is a hierarchical and lightweight Java development framework. It mainly includes IOC (Inverse of Control control inversion also called dependency injection) and AOP (Aspect Oriented Programming aspect-oriented programming) and provides enterprise-level development technologies such as presentation layer spring MVC and persistence layer spring JDBC as well as transaction management. And the spring framework can easily let us integrate other development frameworks and reduce the difficulty of integration between the framework and the framework.

Let's take a look at what the specific technologies mentioned above are for.

IOC

The main function of IOC is to separate the dependencies between classes from the code and describe them in the way of configuration files. Then the IOC container is responsible for the creation, management, acquisition, and so on, between dependent classes. To put it bluntly, IOC exists for us to deal with class instantiation.

AOP

AOP is actually a programming idea. That is, add crosscutting logic to the code. In the spring framework, the AOP function is to change the functionality of a class without changing the source code of the class. The underlying layer is achieved by dynamically modifying the run-time bytecode.

Data access

We know that there is a need for data access when developing any project, but there are many technologies to access the database. Such as JDBC, Hibernate, Mybatis and so on. In order to solve the difference of accessing database by different technologies, spring encapsulates spring in DAO layer, which simplifies the complexity of accessing database and provides unified exception handling and transaction handling.

Support for web development

Spring provides various utility classes for Web applications. You can initialize the spring container through Listener and Servlet, and support Velocity, FreeMarker, XSLT, and so on. In addition, a complete MVC framework similar to Struts is provided. His name is springMVC.

That's all for "what spring is". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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