Spring Framework Seven Modules

1. The Spring Core:core package is the most fundamental part of the framework, providing IOC and dependency injection characteristics. The basic concept here is beanfactory, which provides a classic implementation of the factory pattern to eliminate the need for procedural singleton patterns and really allows you to isolate dependencies and configurations from the program logic.

2.Spring Context: The context package, built on the core package, provides a framework for object access, some like the Jndi registrar. The context wrapper package is characterized by the beans package and adds support for internationalization (i18n), event propagation, the way resources are loaded, and the transparent creation of the context, such as through a servlet container.

3. Spring Dao:dao (Data Access Object) provides a JDBC abstraction layer that eliminates lengthy JDBC encoding and resolves database vendor-specific error codes. Also, the JDBC package provides a better declarative transaction management approach than programmatic, not only for specific interfaces, but also for all pojos (plain old Java objects).

The 4.Spring Orm:orm package provides an integrated layer of commonly used "object/relationship" mapping APIs. These include JPA, JDO, Hibernate, and IBatis. With the ORM package, you can mix the "object/relationship" mappings with all of the spring-provided features, such as the simple declarative transaction management mentioned earlier.

The AOP package for 5.Spring aop:spring provides an aspect-oriented programming implementation that conforms to the AOP Alliance specification, allowing you to define, for example, method interceptors (method-interceptors) and Pointcuts (pointcuts), logically, Thereby weakening the functional coupling of the code, clearly separated away. Also, with the Source-level metadata feature, you can incorporate various behavioral information into your code.

Web Packages in 6.Spring web:spring provide the underlying integration features for web development, such as multi-party file uploads, and the use of servlet listeners for IOC container initialization and web-based applicationcontext. When using spring with webwork or struts, this package enables spring to be combined with other frameworks.

The MVC wrapper package in 7.Spring Web Mvc:spring provides a model-view-controller (MVC) Implementation of the Web application. The spring MVC Framework does not simply provide a traditional implementation, it provides a clear separation model between the domain model code and the Web form. Also, other features of the spring framework can be used.

Spring Framework Seven Modules