国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home Java javaTutorial spring-: spring-bean-lifecycle-execution-order

spring-: spring-bean-lifecycle-execution-order

Jan 29, 2025 pm 06:08 PM

spring-: spring-bean-lifecycle-execution-order

This article comprehensively analyzes the life cycle of Spring Bean, which covers all related life cycle interfaces and methods covering the BeanFactory interface to fully present the operating process of Bean.


I. Spring Bean Life Cycle logic execution order (from instantiation to destruction)

(instantiated to destruction)

    Loading bean definition (metadata processing)
  1. Spring from the

    configuration file (@Configuration), XML file or component scan (@Component)
      read bean definition.
    • This is metadata processing steps , no instance has been created.
    • Related method:
    • BeanDefinitionRegistry#registerBeanDefinition()
  2. bean instantiated (created by object)

  1. Create the actual bean object through the following ways:

    The constructive function is instantiated

      Factory method
      • Related method:
    • Set the bean name InstantiationAwareBeanPostProcessor#postProcessBeforeInstantiation() (
    • )
If bean implement
, Spring will call
    Method to
  1. inform Bean's own name

    . This happened before before the injection BeanNameAware#setBeanName(String name).

      Use case:
    • If bean needs to know its name BeanNameAware in the context of the application. setBeanName()
    • Set the bean class loader ()
    • If bean needs to access its class loader
    , Spring will call this method.
Usage:
public class MyBean implements BeanNameAware {
    @Override
    public void setBeanName(String name) {
        System.out.println("Bean Name Set: " + name);
    }
}
If bean
dynamically load the class
    at runtime.
  1. BeanClassLoaderAware#setBeanClassLoader(ClassLoader classLoader)

    • <置> Set Beanfactory (
    • )
    • Spring Injects Beanfactory into Bean.
    <例> Use case:
  2. Allow bean
Get other bean
public class MyBean implements BeanClassLoaderAware {
    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        System.out.println("ClassLoader Set!");
    }
}
by programming.
  1. BeanFactoryAware#setBeanFactory(BeanFactory factory)

      <置> Set the environment
    • ()
    • If bean needs to access environment variables and attributes , this method will be called. <例> Use case:
    • Used to dynamically access the value in
    .
public class MyBean implements BeanFactoryAware {
    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        System.out.println("BeanFactory Set!");
    }
}

  1. <置> Set the embedded value parser EnvironmentAware#setEnvironment(Environment environment) (

    )
      • Allowed bean Analyzing the placement of placement ($ {Property})
      • .
      • <例> Usage: When bean needs manually parsing the placeholder is useful.
public class MyBean implements BeanNameAware {
    @Override
    public void setBeanName(String name) {
        System.out.println("Bean Name Set: " + name);
    }
}

  1. <置> Set the resource loader () ResourceLoaderAware#setResourceLoader(ResourceLoader loader)

      Only applies to
    • ApplicationContext for dynamic loading resources.
    • <例> Use case:
    • Loading files, class path resources or external resources.

    <置> Set the application event publisher
  1. (

    ) ApplicationEventPublisherAware#setApplicationEventPublisher(ApplicationEventPublisher publisher) If bean needs

    to publish an event
      , this method will be called.
    • <例> Use case: Used for broadcasting events, such as
    • .
    • ContextRefreshedEvent
<置> Set the message source
(
    )
  1. If bean needs Internationalization (I18N) to support MessageSourceAware#setMessageSource(MessageSource source), Spring will inject MessageSource.

  2. <置> Set ApplicationContext
(
)
  1. If bean needs to access the entire Spring ApplicationContext , this method will be called. ApplicationContextAware#setApplicationContext(ApplicationContext ctx)

    <例> Example:
      Allow dynamic access to
    • other beans, environmental settings, etc. .
    • <置> Set the servertContext
    (
  2. )

    Only applicable to
  1. Web applications

    , used to access the Web context information . ServletContextAware#setServletContext(ServletContext ctx)

    • <始> The post -processing before the initialization
    • (
    )

Allowed
    before bean
  1. before the

    modified bean. BeanPostProcessor#postProcessBeforeInitialization()

    • <定> Customized initialization
<<>
  1. Custom <方法> Method

    <的> Custom

    • InitializingBean afterPropertiesSet()
    • @PostConstruct
    • <始> After the initialized post -treatment
    • (@Bean) init-method
    Allow bean to initialize
  2. later
modify bean.
public class MyBean implements BeanClassLoaderAware {
    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        System.out.println("ClassLoader Set!");
    }
}

<例> Example:
    Used to create proxy, log records or face -oriented programming (AOP)
  1. .

    BeanPostProcessor#postProcessAfterInitialization()

    • bean available
      • Bean has completely initialized and can be used for applications.

<、> 2. Destruction stage (bean close the life cycle)

When the application is closed, Spring will be elegant

destroyed bean

.

    <毀> The treatment before destroyed
  1. (

    ) DestructionAwareBeanPostProcessor#postProcessBeforeDestruction() Allows to clean up before the destroy

    .
    <<> The
  2. Method
  3. DisposableBean If bean is implemented, destroy() will be called.

    • DisposableBean destroy()
    <定> Custom
  4. Method (preferred method)
public class MyBean implements BeanNameAware {
    @Override
    public void setBeanName(String name) {
        System.out.println("Bean Name Set: " + name);
    }
}
  1. is more modern than <現(xiàn)>, and

    call before bean destroyed . @PreDestroy

    • DisposableBean <定> Custom
    • (If defined in
    )
public class MyBean implements BeanClassLoaderAware {
    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        System.out.println("ClassLoader Set!");
    }
}
    Define the alternative method of cleaning the logic.
  1. destroy-method @Bean Three, the complete process summary (final order)

    • ? Bean initialization stage
Load bean definition

instantiated bean ()

(

) (

)
  1. (
  2. )
  3. new Bean() (
  4. )
  5. setBeanName() (BeanNameAware)
  6. (setBeanClassLoader()) BeanClassLoaderAware
  7. (
  8. ) setBeanFactory() BeanFactoryAware (
  9. )
  10. setEnvironment() (EnvironmentAware)
  11. (setEmbeddedValueResolver()) EmbeddedValueResolverAware
  12. (
  13. ) setResourceLoader() ResourceLoaderAware /
  14. setApplicationEventPublisher() (ApplicationEventPublisherAware)
  15. bean available setMessageSource() MessageSourceAware
  16. setApplicationContext() ? Bean's destruction stage ApplicationContextAware
  17. setServletContext() (ServletContextAware)
  18. (postProcessBeforeInitialization()) BeanPostProcessor
  19. @PostConstruct afterPropertiesSet()
  20. postProcessAfterInitialization() More information about interface and methods, please visit: BeanPostProcessor http://www.miracleart.cn/link/6759d0996526ddc8e27aa550F0B806B1
  21. I wish you a happy coding! ?

The above is the detailed content of spring-: spring-bean-lifecycle-execution-order. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Difference between HashMap and Hashtable? Difference between HashMap and Hashtable? Jun 24, 2025 pm 09:41 PM

The difference between HashMap and Hashtable is mainly reflected in thread safety, null value support and performance. 1. In terms of thread safety, Hashtable is thread-safe, and its methods are mostly synchronous methods, while HashMap does not perform synchronization processing, which is not thread-safe; 2. In terms of null value support, HashMap allows one null key and multiple null values, while Hashtable does not allow null keys or values, otherwise a NullPointerException will be thrown; 3. In terms of performance, HashMap is more efficient because there is no synchronization mechanism, and Hashtable has a low locking performance for each operation. It is recommended to use ConcurrentHashMap instead.

Why do we need wrapper classes? Why do we need wrapper classes? Jun 28, 2025 am 01:01 AM

Java uses wrapper classes because basic data types cannot directly participate in object-oriented operations, and object forms are often required in actual needs; 1. Collection classes can only store objects, such as Lists use automatic boxing to store numerical values; 2. Generics do not support basic types, and packaging classes must be used as type parameters; 3. Packaging classes can represent null values ??to distinguish unset or missing data; 4. Packaging classes provide practical methods such as string conversion to facilitate data parsing and processing, so in scenarios where these characteristics are needed, packaging classes are indispensable.

What are static methods in interfaces? What are static methods in interfaces? Jun 24, 2025 pm 10:57 PM

StaticmethodsininterfaceswereintroducedinJava8toallowutilityfunctionswithintheinterfaceitself.BeforeJava8,suchfunctionsrequiredseparatehelperclasses,leadingtodisorganizedcode.Now,staticmethodsprovidethreekeybenefits:1)theyenableutilitymethodsdirectly

How does JIT compiler optimize code? How does JIT compiler optimize code? Jun 24, 2025 pm 10:45 PM

The JIT compiler optimizes code through four methods: method inline, hot spot detection and compilation, type speculation and devirtualization, and redundant operation elimination. 1. Method inline reduces call overhead and inserts frequently called small methods directly into the call; 2. Hot spot detection and high-frequency code execution and centrally optimize it to save resources; 3. Type speculation collects runtime type information to achieve devirtualization calls, improving efficiency; 4. Redundant operations eliminate useless calculations and inspections based on operational data deletion, enhancing performance.

What is an instance initializer block? What is an instance initializer block? Jun 25, 2025 pm 12:21 PM

Instance initialization blocks are used in Java to run initialization logic when creating objects, which are executed before the constructor. It is suitable for scenarios where multiple constructors share initialization code, complex field initialization, or anonymous class initialization scenarios. Unlike static initialization blocks, it is executed every time it is instantiated, while static initialization blocks only run once when the class is loaded.

What is the `final` keyword for variables? What is the `final` keyword for variables? Jun 24, 2025 pm 07:29 PM

InJava,thefinalkeywordpreventsavariable’svaluefrombeingchangedafterassignment,butitsbehaviordiffersforprimitivesandobjectreferences.Forprimitivevariables,finalmakesthevalueconstant,asinfinalintMAX_SPEED=100;wherereassignmentcausesanerror.Forobjectref

What is the Factory pattern? What is the Factory pattern? Jun 24, 2025 pm 11:29 PM

Factory mode is used to encapsulate object creation logic, making the code more flexible, easy to maintain, and loosely coupled. The core answer is: by centrally managing object creation logic, hiding implementation details, and supporting the creation of multiple related objects. The specific description is as follows: the factory mode handes object creation to a special factory class or method for processing, avoiding the use of newClass() directly; it is suitable for scenarios where multiple types of related objects are created, creation logic may change, and implementation details need to be hidden; for example, in the payment processor, Stripe, PayPal and other instances are created through factories; its implementation includes the object returned by the factory class based on input parameters, and all objects realize a common interface; common variants include simple factories, factory methods and abstract factories, which are suitable for different complexities.

What is type casting? What is type casting? Jun 24, 2025 pm 11:09 PM

There are two types of conversion: implicit and explicit. 1. Implicit conversion occurs automatically, such as converting int to double; 2. Explicit conversion requires manual operation, such as using (int)myDouble. A case where type conversion is required includes processing user input, mathematical operations, or passing different types of values ??between functions. Issues that need to be noted are: turning floating-point numbers into integers will truncate the fractional part, turning large types into small types may lead to data loss, and some languages ??do not allow direct conversion of specific types. A proper understanding of language conversion rules helps avoid errors.

See all articles