spring factory pattern injection

This article continues with the previous article, describing dependency processing in the spring Ioc.Depend onIn general, enterprise applications will not have only one object (or spring Bean). Even the simplest applications need multiple objects to work together to make the end user see a complete Application. The next section will explain how developers can start by simply defining separate beans, to let

axe; corresponding to a simple factory design pattern, callers need to locate the factory without having to manage the specific implementation of the calleeTo enter the "Communist" society, people who need an axe do not even have to locate the factory, "Wait for" the society to provide, the caller does not need to car

. Create using constructors (common)Creating a Bean,bean using the constructor must have a default constructor2, the use of static Factory modeProvide a static factory:1 Public classFactorybean {2 /**3 * Must be a static method4 * @return5 */6 Public StaticUser CreateUser () {7 return NewUser ();8 }9}To configure:1 ID: uniquely identifies 2class : Static

, after all, refactoring is only necessary to do. However, the work of a dependency injection is definitely not done automatically, and a large number of dependency injection frameworks have emerged to address this problem. If you don't want to use a bulky frame, then you have to create an instance of a, and then you have to know the exact type of a, after all, you can't just make a new interface, at least

[Architecture Pattern] Factory Builder PurposeThe two functions of the deferred injection object and the Mount injection project are also provided.SceneWhen developing a system, if you need to generate and inject objects at run time, you can apply the Factory mode to provide

product series3. The series of the same product is set to be used together4. Different products appear in a series of interfaces, so that the system does not depend on the details of the implementation of the interface.In our frequently used Java framework, our JDBC is using the factory model, JDBC only provides a factory for production data manipulation objects, different databases only need to implement

-arg Index="0" ref="Springdao">constructor-arg> constructor-arg Index="1" ref="user">constructor-arg> Bean> The other is to set the parameter type:constructor-arg type="java.lang.String" ref=""/> 3, Static factory method injectionBy calling the static factory method to get the objects you need, in order for spring to manage all the objects, we cannot

actually changed, but there is only one more layer. But actually not, spring bean Management maintains bean Dependencies from spring configuration files. Before calling each other, spring has long assembled various beans according to this management file. This is the so-called control reversal. In this way, bean functions become more simple, and complicated rel

Design Pattern Learning -- Abstarct Factory, -- abstarctfactoryWhat Abstarct Factory: provides an interface for creating a series of related or mutually dependent interfaces without specifying their specific classes. Why Abstarct Factory is a type of creation design pattern