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How to achieve the introduction to Spring, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

Spring is created to solve the enterprise application development environment. One of the main advantages of the framework is the hierarchical architecture, which allows users to choose which components to use, and also provides an integrated framework for javaEE application development.

IOC and AOP are the core modules of Spring and the basis of application development of other components of other modules in the system. Only by deeply understanding the basic principles of these two modules, can we better develop Spring applications.

I. Overview of Spring

A brief introduction to a.Spring

Spring is a lightweight inversion of control (IoC) and aspect-oriented (AOP) container framework, it is mainly to solve the complexity of enterprise application development.

Objective: to solve the complexity of enterprise application development

Function: use basic JavaBean instead of EJB

Scope: any Java application

The Origin of b.Spring

Spring exists because it has unique advantages:

It locates in areas that other framework does not have.

Spring is comprehensive and modular

It is designed to help developers write code that is easy to test from the bottom.

Spring is a potential one-stop solution

Advantages of c.Spring

Spring is born with the following advantages:

Low intrusive design with extremely low code pollution

Write Once,Run Anywhere

DI effectively reduces the coupling degree.

AOP provides centralized management of common tasks

ORM and DAO simplify access to the database

Highly open and not mandatory

The benefits that Spring brings to development:

Can effectively organize middle-tier objects

Use a unified profile

Promote good programming habits and reduce programming costs

Easy to unit test

Make EJB an alternative

Provides a consistent framework for data access

Characteristics of d.Spring

Facilitate decoupling and simplify development

Support for AOP programming

Support for declarative transactions

Convenient program testing

Easy to integrate all kinds of excellent frameworks

Reduce the difficulty of using JavaEE API

The source code of Spring is a classic learning example.

The core module of e.Spring

The Spring framework is a hierarchical architecture consisting of seven well-defined modules. The module of Spring is built on top of the core container, which corresponds to the way Bean is created, configured, and managed. Each module or component that makes up the Spring framework can exist alone or in conjunction with one or more other modules to implement an application.

Core container (Spring Core)

The core container defines the basic functions of the framework. The main component of the core container is BeanFactory, which is the implementation of the factory pattern. BeanFactory uses the inversion of Control (IOC) mode to separate the application's configuration and dependency specifications from the actual application code.

Application context (Spring Context)

The Spring context is a configuration file that provides context information to the Spring framework. The Spring context includes enterprise services such as JNDI, EJB, email, internationalization, checksum and scheduling capabilities.

AOP module (Spring AOP)

Through the configuration management feature, Spring's AOP module directly integrates aspect-oriented programming functions into the Spring framework. Therefore, it is easy to make any object managed by the Spring framework to support AOP. Spring's AOP module provides transaction management services for objects in Spring-based applications. By using Spring AOP, declarative transaction management can be integrated into applications without relying on EJB components.

JDBC and DAO module (Spring DAO)

The JDBC DAO abstraction layer provides a meaningful exception hierarchy that can be used to manage exception handling and error messages thrown by different database vendors. The exception hierarchy simplifies error handling and greatly reduces the amount of exception code that needs to be written (such as opening and closing connections). Spring DAO's JDBC-oriented exceptions follow the general DAO exception hierarchy.

Object entity Mapping (Spring ORM)

The Spring framework inserts several ORM frameworks, providing a relational tool for ORM objects. These include JDO, Hibernate, and iBats. All of this follows Spring's generic transaction and DAO exception hierarchy.

Web module (Spring Web)

The Web context module is built on top of the application context module and provides context for Web-based applications. So the Spring framework supports integration with Struts. The Web module also simplifies the work of handling multi-part requests and binding request parameters to pre-objects.

MVC module (Spring Web MVC)

Spring's MVC framework is a full-featured MVC implementation for building Web applications. Through the policy interface, the MVC framework becomes highly configurable. MVC houses a number of view technologies, including JSP, Tiles, iText, and POI. The model is composed of JavaBean and stored in map. The view is an interface that implements the model. The controller represents the logic code and is the implementation of Controller.

The functionality of the Spring framework can be used in any J2EE server, and most of the features also apply to unmanaged environments. The core point of Spring is to support access objects for reusable business and data that do not use specific JavaEE services. There is no doubt that such businesses and objects can be reused between separate applications and test environments in different JavaEE environments.

After reading the above, have you mastered how to get started with Spring? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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