Common tools jar description
Providing the AOP (aspect-oriented programming) implemented: spring -aop
spring provides the integration of AspectJ framework: spring-aspects
Providing the IoC (inversion control) underlying implementation: spring-beans
IoC spring provided on the basis of functional extension of the service: spring-context
Expanded support for the spring-context: spring-context-support
spring core components: spring-core
spring expression language: spring-expression
JDBC support package provided to the spring: spring-jdbc
Integrate third-party ORM framework: spring-orm
Simple packaging unit testing and integration testing: spring-test
Package for transaction management: spring-tx
springMVC end support for web application deployment architecture: spring-web
Implement the view controller REST Web services and Web applications: spring-webmvc
General construction Injection:
1. Create a spring xml configuration no applictionContext.xml
2, declare an object in the spring configuration file
(Object information tells spring containers, and class id e.g., spring containers according to class, can create an object named user1 by using the constructor with no arguments reflection (default))
id and name differences
The actual development process, we can ignore the id and name different. It can be mixed. By getBean () can get method, this method is overloaded.
id = "user1, user2, user3 " represents the bean has a name, and that name is user1, user2, user3 (ID not duplicate in the same configuration file)
name = "user1, user2, user3 " represents the bean have multiple names, multiple names are user1 , user2 and user3
3, the initialization container:
ApplicationContext ac = new ClassPathXmlApplicationContext(applicationContext.xml)；
4, call the object is injected into the spring
GetBean obtained by the method call in the container. ac.getBean ( "object name" object type);
Examples of acquired directly through a Bean type. ac.getBean (object type); there is a potential risk, if there are a plurality of the same object type, will be given.
Note: The need to meet the general structure injected constructor (constructor referenced objects) to succeed.