what is spring

Spring is an open source lightweight Java application framework for building enterprise-level applications. It provides a wealth of functions and components, including dependency injection, aspect-oriented programming, transaction management, data access, messaging, etc., as well as integrated support for various application layer frameworks. The design goal of the Spring framework is to simplify the development of enterprise-level applications, improve code maintainability and testability, and reduce development complexity. The core function of Spring is to provide a lightweight container for managing objects and their dependencies in applications.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Spring is an open source lightweight Java application framework for building enterprise-level applications. It provides a wealth of functions and components, including dependency injection, aspect-oriented programming, transaction management, data access, messaging, etc., as well as integrated support for various application layer frameworks. The design goal of the Spring framework is to simplify the development of enterprise-level applications, improve code maintainability and testability, and reduce development complexity. The Spring framework is widely used in the development of Java enterprise applications.

The core function of Spring is to provide a lightweight container (also called IoC container) for managing objects and their dependencies in applications. This container is responsible for tasks such as creating objects, configuring objects, assembling objects, and managing object life cycles.

In addition to the core container functions, Spring also provides many other functions and tools, such as:

1. Aspect-oriented programming (AOP): Spring AOP allows developers to define horizontal Focus on the focus, extract duplicate codes scattered throughout the application, and encapsulate them uniformly, so that the functions of the program can be enhanced without changing the original code.
2. Data access: Spring provides seamless integration with third-party data access frameworks (such as Hibernate, JPA), and it also provides a set of JDBC access templates to facilitate database access.
3. Web layer framework: Spring provides the Spring MVC framework to easily build the web layer. At the same time, it also supports seamless integration with other web frameworks such as Struts and JSF.
4. Transaction management: Spring simplifies the management of database transactions. It provides declarative transaction management, allowing developers to focus more on the implementation of business logic.
5. Security control: Spring provides a complete security control framework that can easily implement user authentication and permission control.
6. Message passing: Spring supports integration with message middleware, such as ActiveMQ, RabbitMQ, etc., allowing applications to implement asynchronous message processing.
7. Log and monitoring: Spring integrates the log framework and supports log level management, log cutting, log analysis and other functions. At the same time, Spring also provides monitoring and management tools to facilitate performance monitoring and debugging of running applications.

To sum up, Spring is a powerful development framework that can make the development of enterprise-level applications simpler, faster and maintainable.

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