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This article mainly introduces what are the characteristics of the factory pattern in Spring. It is very detailed and has a certain reference value. Friends who are interested must read it!

I. the advantages of hungry Han style creation

After the factory is created, all the objects in the Spring configuration file are created (hungry).

Improve the running efficiency of the program. Avoid multiple IO and reduce object creation time. (the concept is close to the connection pool, create it at once, and obtain it directly when you use it.)

II. Life cycle approach

Custom initialization method: add the "init-method" attribute, and Spring will call this method after the object is created.

Custom destruction method: add the "destroy-method" attribute, and Spring will call this method before destroying the object.

Destroy: after the factory's close () method is called, Spring destroys all singleton objects that have been created.

Classification: Singleton objects are destroyed by Spring containers, and Prototype objects are destroyed by JVM.

III. Notes on life cycle

Initialize comments, destroy comments

Import javax.annotation.PostConstruct;import javax.annotation.PreDestroy; @ PostConstruct / / initialize public void init () {System.out.println ("init method executed");} @ PreDestroy / / destroy public void destroy () {System.out.println ("destroy method executed");} IV. Lifecycle phase

Single case bean:singleton

Create with factory startup = "construction method = =" set method (input value) = = "init (initialization) = =" build complete = = "destroy with factory shutdown

Multiple cases of bean:prototype

Create when used = "Construction method = =" set method (input value) = = "init (initialization) = =" build complete = = "JVM garbage collection destruction

5. Use cases

User entity class

Package com.cos.qf.entity; import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import java.util.*; public class User {private Integer id; private String password; private String sex; private Integer age; private Date bornDate; private String [] hobbys; private Set phones; private List names; private Map countries; private Properties files @ PostConstruct / / initialize public void init () {System.out.println ("initialized");} @ PreDestroy / / destroy public void destroy () {System.out.println ("destroyed");} public User () {System.out.println ("No parameter construction performed") } public void setId (Integer id) {System.out.println ("set-id"); this.id = id;} / / get and set method}

Application-config.xml profile

Test method: do not use the parent class (ApplicationContext) of ClassPathXmlApplicationContext to turn it off or you will report an error

@ Test public void text4 () {ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext ("application-config.xml"); ctx.close ();} above is all the content of the article "what are the characteristics of factory schemas in Spring?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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