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Spring core framework architecture is how, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Many people are using spring to develop java projects, but when configuring maven dependencies, it is not clear which spring jar should be configured, often adding a bunch randomly, compiling or running errors will continue to configure jar dependencies, resulting in spring dependency confusion, and even the next time to create the same type of project do not know which spring dependencies to configure, only copy, in fact, that's what I did!

There are only about 20 jar packages in spring, each with corresponding functions, and a jar may also rely on several other jar, so it is easy to figure out the relationship between them and configure maven dependency. for example, what jar is required to use the spring framework in an ordinary java project? Just one.

Org.springframework spring-context 3.2.17.RELEASE

What about introducing spring mvc into the web project? As long as you configure a dependency

Org.springframework spring-webmvc 3.2.17.RELEASE

Why can it be configured in this way? Next, we will take the spring 3.2.17.RELEASE version as an example to introduce the spring framework structure. Spring 4 is slightly different and will be introduced in *.

The official website of spring gives a structure diagram of spring3.

In the figure, the spring is divided into five parts: core, aop, data access, web, and test. Each rounded rectangle in the figure corresponds to a jar. If configured in maven, the "groupId" of all these jar is "org.springframework", and each jar has a different "artifactId". In addition, "instrumentation" has two jar and a "spring-context-support" figure is not listed, so there are a total of 19 jar packets for spring3.

The jar and dependencies of these five parts are described below.

Core

The core section contains 4 modules

Spring-core: the most basic implementation of dependency injection IoC and DI

The assembly of spring-beans:Bean factory and bean

The context context of spring-context:spring is the IoC container

Spring-expression:spring expression language

Their complete dependencies

Because spring-core depends on commons-logging and other modules rely on spring-core, the whole spring framework depends on commons-logging. If you have your own log implementation such as log4j, you can eliminate the dependence on commons-logging, exclude commons-logging dependency without log implementation, and compile errors.

Org.springframework spring-context 3.2.17.RELEASE commons-logging commons-logging

Aop

The aop section contains 4 modules

Spring-aop: aspect-oriented programming

Spring-aspects: integrated AspectJ

Spring-instrument: provides some class-level tool support and ClassLoader-level implementation for servers

Spring-instrument-tomcat: instrument implementation for tomcat

Their dependencies

Data access

The data access section contains 5 modules

Support for spring-jdbc:jdbc

Spring-tx: transaction control

Spring-orm: object-relational mapping, integrated orm framework

Spring-oxm: object xml mapping

Spring-jms:java message service

Their dependencies

Web

The web section contains 4 modules

Spring-web: basic web functions, such as file upload

Spring-webmvc:mvc implementation

Spring-webmvc-portlet: mvc implementation based on portlet

Spring-struts: integration with struts, not recommended, spring4 is no longer available

Their dependencies

Test

There is only one module in the test section. I'll put the spring-context-support here, too.

Spring-test:spring testing, providing junit and mock testing functions

Additional support packages for spring-context-support:spring, such as mail service, view parsing, etc.

Their dependencies

This is the end of the introduction to spring3. Looking at these pictures, I'm sure there will be no more confusion when you configure spring dependencies in maven.

Here is an introduction to spring4, which is basically the same as spring3. Here is the structure diagram given on the official website.

As you can see, the struts of spring3 is removed, messaging and websocket are added, and other modules remain unchanged, so there are 20 jar for spring4.

Spring-websocket: an efficient communication tool for web applications

Spring-messaging: used to build message-based applications

Their dependencies

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