Spring annotations how to specify InitMethod and DestroyMethod for bean

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Spring comments specify InitMethod and DestroyMethod/** for bean to specify init methods and destroy methods for construction * 1: in the configuration class @ Bean (initMethod = "init", destroyMethod = "destory") note specifies * 2: implement the InitializingBean interface to override its afterPropertiesSet method and DisposableBean interface to rewrite the destroy method * 3: use @ PostConstruct in the JSR250 specification of java to mark the init method, and @ PreDestroy to mark the destroy note * /

It is important to note that:

Single instance bean: creates an object when the container starts

Multi-instance bean: create an object each time you get it

Initialize:

Object creation is complete, assignment is complete, initialization method is called

Destroy:

Single instance: called when the container is closed

Multiple instances: the container will not be destroyed and can only be called manually.

Here is the specific code

Car.java

Public class Car {public Car () {System.out.println ("Car's Constructor..");} public void init () {System.out.println ("Car's Init...");} public void destory () {System.out.println ("Car's Destroy...");}}

Configuration class

@ Bean (initMethod = "init", destroyMethod = "destory") public Car car () {return new Car ();} Note initMethod and destroyMethod@Configurationpublic class AppConfig {@ Bean (initMethod = "init") public Foo foo () {return new Foo ();} @ Bean (destroyMethod = "cleanup") public Bar bar () {return new Bar ();}

There are no parentheses after initMethod and destroyMethod in the above code.

Remember not to wear parentheses.

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