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This article will explain in detail what Spring is in JavaWeb. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Spring is a lightweight IoC and AOP-oriented container framework.

Spring is a container because it contains and manages the life cycle of application objects, Spring implements the composition of a complex application using simple component configurations, and combines these objects in Spring using XML and Java annotations.

# spring core development package

Configure the springframework package in pom/xml

4.3.19.RELEASE UTF-8 1.81.8 org.springframework spring-core ${spring.version} org.springframework spring-beans ${spring.version} org.springframework spring-context ${spring.version}

Spring core development package

Spring Core

Spring Beans

Spring AOP

Spring Context

Spring auxiliary development kit

Spring Aspects

Spring Context Support

Spring Expression

Spring Framework Bom

Spring Instrument

Spring Instrument Tomcat

Spring JDBC

Spring JMS

Spring orm

Spring oxm

Spring Struts

Spring test

Spring web

Spring tx

Spring webmvc

# write HelloWorld

Create HelloWorld.java

Create applicationContext.xml and configure bean

Run main.java

Print the result

# IOC

IOC (inverse of control inversion of Control): when we need an object, we don't new one in our own program. Instead, it is created and maintained by the web container (the container of spring)

DI (dependency injection dependency injection): an implementation of control inversion

# AOP

# Bean

Id must be unique in the IOC container

# non-invasive

The so-called non-intrusive means that the API of the Spring framework will not appear in the business logic, that is, the business logic is POJO. Because there is no API of Spring in the business logic, the business logic can be quickly migrated from the Spring framework to other frameworks, that is, independent of the environment.

# container

As a container, Spring can manage the life cycle of objects and the dependencies between objects. You can define objects and set dependencies with other objects through configuration files.

This is the end of this article on "what is Spring in JavaWeb?". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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