What is Spring in Java

Spring in Java is an open source Java platform that provides a comprehensive programming and configuration model for building enterprise-level applications. It aims to simplify enterprise-level Java development. By providing a comprehensive set of functions, including dependency injection, transaction management, security, data access, etc., developers can focus on the implementation of business logic instead of getting involved in cumbersome underlying configuration and management. Work.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Spring is an open source Java platform that provides a comprehensive programming and configuration model for building enterprise-level applications. It is a lightweight framework that is very flexible in design, allowing developers to choose specific components according to their needs. Spring's goal is to simplify enterprise-level Java development. By providing a comprehensive set of functions, including dependency injection, transaction management, security, data access, etc., developers can focus on the implementation of business logic instead of getting stuck in cumbersome underlying configuration and management work.

The core of Spring is an Inversion of Control (IoC) container, which is responsible for creating and configuring objects and their dependencies in applications. Through IoC containers, developers can liberate the relationships between objects from hard coding and achieve a more flexible and maintainable code structure. The IoC container also provides an automatic assembly function, which simplifies the assembly process of objects and avoids a large amount of configuration code.

Spring also provides a series of functional modules, including Spring MVC, Spring Security, Spring Data, Spring Cloud, etc. These modules further expand the functional scope of the Spring platform. Spring MVC is a Java-based web framework for building web applications. It simplifies the development of the Web layer, provides a model-view-controller (MVC) architecture pattern, separates the business logic, data and presentation layers, and improves the maintainability and reusability of the code.

Spring Security is a security framework that provides authentication and authorization mechanisms. It helps developers build secure applications and protect sensitive operations from unauthorized access and data leakage. Spring Security supports various authentication mechanisms, such as username and password authentication, OAuth2, etc.

Spring Data is an extension module that provides a complete set of data access abstractions for Spring applications. It simplifies the development of the data access layer. Developers can use annotations or templates to perform database operations without writing cumbersome SQL statements or processing JDBC-related code. Spring Data supports various persistence technologies, including relational databases, NoSQL databases, etc.

In addition, Spring also provides many other modules and extension points, such as Spring AMQP (supporting message queues), Spring Integration (enterprise integration), etc. These modules provide powerful support for building various types of enterprise applications.

Another important feature of Spring is the openness of its ecosystem. Because Spring is an open source project with huge community support, many companies and developers have contributed rich extension libraries and tools to it. This makes it easy to find ready-made solutions or libraries to meet specific needs when developing applications on the Spring platform.

In general, Spring in Java is a comprehensive enterprise-level application development framework. By providing rich functions and modular architecture, Spring simplifies various complex tasks in Java development, allowing developers to build high-quality applications more efficiently. At the same time, due to its openness and community support, Spring has become one of the important platforms in Java development.

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