Spring Bean 生命周期测试

 本文代码github地址

bean的生命周期是开始创建到销毁的过程。需要实现相关的类beannameaware   ，disposablebean, initializingbean ，并注册instantiationawarebeanpostprocessor。

 

 

bean类实现beannameaware   ，disposablebean, initializingbean 接口

package com.bean.life.entity;

import org.springframework.beans.beansexception;
import org.springframework.beans.factory.*;
import org.springframework.stereotype.component;


@component
public class user implements beanfactoryaware
    , beannameaware
    , initializingbean
    , disposablebean
{
    @override
    public void setbeanfactory(beanfactory beanfactory) throws beansexception {
        system.out.println("beanfactoryaware  setbeanfactory");
    }

    @override
    public void setbeanname(string s) {
        system.out.println("beannameaware接口：  setbeanname = " + s);
    }

    @override
    public void afterpropertiesset() throws exception {
        system.out.println("initializingbean接口：  afterpropertiesset");
    }

    @override
    public void destroy() throws exception {
        system.out.println("disposablebean接口：  destroy");

    }

    @postconstruct
    public  void init(){
        system.out.println("postconstruct");
    }

    @predestroy
    public  void destory(){
        system.out.println("predestroy");
    }
}

 注册instantiationawarebeanpostprocessor接口。

这里的instantiationawarebeanpostprocessoradapter是 instantiationawarebeanpostprocessor 的子孙类。

package com.bean.life.entity;

import org.springframework.beans.beansexception;
import org.springframework.beans.propertyvalues;
import org.springframework.beans.factory.config.instantiationawarebeanpostprocessoradapter;
import org.springframework.stereotype.component;

import java.beans.propertydescriptor;
import java.lang.reflect.constructor;


@component
public class myinstantiationawarebeanpostprocessor extends
        instantiationawarebeanpostprocessoradapter {


    public myinstantiationawarebeanpostprocessor() {
        super();
    }

    @override
    public constructor<?>[] determinecandidateconstructors(class<?> beanclass, string beanname) throws beansexception {

        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口： determinecandidateconstructors: " + beanname);
        }

        return super.determinecandidateconstructors(beanclass, beanname);
    }

    @override
    public object getearlybeanreference(object bean, string beanname) throws beansexception {
        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口： getearlybeanreference: " + beanname);
        }

        return super.getearlybeanreference(bean, beanname);
    }

    @override
    public object postprocessbeforeinstantiation(class<?> beanclass, string beanname) throws beansexception {
        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口： postprocessbeforeinstantiation: " + beanname);
        }

        return super.postprocessbeforeinstantiation(beanclass, beanname);
    }

    @override
    public boolean postprocessafterinstantiation(object bean, string beanname) throws beansexception {
        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口： postprocessafterinstantiation : " + beanname);
        }

        return super.postprocessafterinstantiation(bean, beanname);
    }

    @override
    public propertyvalues postprocesspropertyvalues(propertyvalues pvs, propertydescriptor[] pds, object bean, string beanname) throws beansexception {

        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口：  postprocesspropertyvalues: " + beanname);
        }
        return super.postprocesspropertyvalues(pvs, pds, bean, beanname);
    }

    @override
    public object postprocessbeforeinitialization(object bean, string beanname) throws beansexception {
        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口： postprocessbeforeinitialization: " + beanname);
        }

        return super.postprocessbeforeinitialization(bean, beanname);
    }

    @override
    public object postprocessafterinitialization(object bean, string beanname) throws beansexception {
        if(beanname.equals("user")){
            system.out.println("myinstantiationawarebeanpostprocessor接口：  postprocessafterinitialization: " + beanname);
        }

        return super.postprocessafterinitialization(bean, beanname);
    }
}

 

输出

mybeanfactorypostprocessor ---  beanfactorypostprocessor
myinstantiationawarebeanpostprocessor接口： postprocessbeforeinstantiation: user
myinstantiationawarebeanpostprocessor接口： determinecandidateconstructors: user
myinstantiationawarebeanpostprocessor接口： postprocessafterinstantiation : user
myinstantiationawarebeanpostprocessor接口：  postprocesspropertyvalues: user
beannameaware接口：  setbeanname = user
beanfactoryaware  setbeanfactory
myinstantiationawarebeanpostprocessor接口： postprocessbeforeinitialization: user
postconstruct
initializingbean接口：  afterpropertiesset
myinstantiationawarebeanpostprocessor接口：  postprocessafterinitialization: user

predestroy
disposablebean接口：  destroy

 

 生命周期图解

spring 实现按 init-method 和destory-method的三种方式

 

•  方式1：xml配置方式

package com.bean.life.entity;

public class user
{

    public  void init(){
        system.out.println("postconstruct");
    }

    public  void destory(){
        system.out.println("predestroy");
    }
}

 

 

<bean id="user" class="com.bean.life.entity" init-method="init" destroy-method="destroy">
</bean>

 

 

• 方式2：注解配置

添加@postconstruct 和@predestroy进行指定

package com.bean.life.entity;


@component
public class user
{

    @postconstruct
    public  void init(){
        system.out.println("postconstruct");
    }

    @predestroy
    public  void destory(){
        system.out.println("predestroy");
    }
}

 

• 方式3： 使用注解@bean

public @interface bean {
    @aliasfor("name")
    string[] value() default {};

    @aliasfor("value")
    string[] name() default {};

    autowire autowire() default autowire.no;

    string initmethod() default "";

    string destroymethod() default "(inferred)";
}

 

@configuration
public class userconfig{
   
      @bean(initmethod="init",destorymethod="destory")
      public user user(){
      return new user();
    }
    
}