Spring Framework Basics

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Introduction to Spring Framework

Spring, an open-source framework, was created by Rod Johnson. Spring is created to address the complexities of enterprise application development, allowing simple javabeans/pojo to accomplish things that were previously only ejb[1]. Spring also provides a number of APIs to simplify integration with other third-party frameworks.

With spring, you'll find that spring solves a lot of problems, but ultimately, all of the api/solutions from spring can be traced back to spring's most fundamental concept of " simplifying Java development ."

▲spring= Simplifying Java Development

Spring Strategy and Core

Spring 4 Key strategies/cores to reduce the complexity of Java development

1. Pojo-based lightweight and minimally intrusive programming

2. Loose coupling via Dependency injection and interface-oriented

3. Declarative programming based on facets and conventions

4. Reduce plate code by cutting and stencil

All of the basic spring api/solutions can be traced back to one or more of the above policies.

Spring drawbacks

While spring can reduce complexity, spring is already a complex framework as spring develops to 4.X today.

Another spring's original goal was a lightweight container framework, but the development of spring4.x is now a heavy-weight framework.

Finally, although spring is the smallest invasive, it gives us the greatest tolerance.

Spring Module Core Module

Spring-core,spring-beans: The framework's most basic module, which provides functions such as IOC and dependency injection

Spring-context: Provides a context object for accessing an object

Spring-context-support: Provides the ability to integrate third-party libraries into context

Spring-expression (SPEL): Provides powerful expression language support to reduce workload

AOP Modules

SPRING-AOP: Provides a facet-oriented API implementation that conforms to the AOP specification

Spring-aspects: provides integration with ASPECTJ

Data Access Integration Module

SPRING-JDBC: Provides APIs to simplify JDBC programming

SPRING-TX: Provides an API to simplify transaction management and programming

Spring-orm: Provides a simplified ORM specification [2] Programming API and provides support for JPA, hibernate

SPRING-OXM: Provides API for simplifying the OXM specification [3] Programming

SPRING-JMS: Provides APIs that simplify the JMS specification [4] Programming

Web Module

Spring-web: Provides an API to simplify basic Web functionality programming

Spring-webmvc,spring-webmvc-portlet: Provides APIs to simplify mvc[5] and restful[6] programming

Spring-websocket: Provides an API that simplifies websocket authoring

Test module

Spring-test: Provides components that support unit testing and integration testing, and simplifies the API for test case programming

Information module

Spring-messaging: Support for message schemas and protocols

Device module

Spring-instrument: Provides class detection support and class loader implementations for use in some application servers

Spring-instrument-tomcat: Provides class detection support and class loader implementations for use in Tomcat

Spring Frame composition

Reference

Spring Framework Reference

Spring in Action

Comments

[1] The EJB here refers to ejb2.x, because the EJB specification can also be implemented using Pojo starting with the ejb3.x specification.

[2] Object-relational mapping, used to map objects represented by the object model to the SQL-based relational model database structure.

[3] Object XML Mapping, a mapping between a data entity object and an XML node.

[4] A member of the Java Messaging Service, which is responsible for interacting with the information middleware (MOM) API. Reference: Basic knowledge of Java EE specifications

[5] MVC is a pattern of creating WEB applications using MVC (Model View Controller-View-controller) design.

[6] RESTful a software architecture style.

Spring Framework Basics