Spring生命周期分為以下步驟：

1.instantiate bean 對象實例化

2.populate properties 封裝屬性

3.如果Bean實現BeanNameAware執行setBeanName

4.如果Bean實現BeanFactoryAware或者ApplicationContextAware設置工廠setBeanFactory或者上下文對象setApplicationContext

5.如果存在類實現BeanPostProcessor執行postProcessorBeforeInitialization

6.如果Bean實現InitializingBean執行afterPropertiesSet

7.調用<bean init-method="init">指定初始化方法init

8.BeanPostProcessor執行postProcessorAfterInitialization

9.執行業務處理(自己寫的方法代碼)

10.如果Bean實現DisposableBean執行destroy

11.調用<bean destroy-method="destory">指定銷毀方法

代碼示例：

配置文件：applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi
 
="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="man" class="com.imooc.ioc.demo3.Man" init-method="setup" destroy-method="teardown">
        <property name="name" value="張三"/>
    </bean>

    <bean class
 
="com.imooc.ioc.demo3.MyBeanPostProcessor"/>
</beans>

Bean：Man.java

package com.imooc.ioc.demo3;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


public class Man implements BeanNameAware,ApplicationContextAware,InitializingBean,DisposableBean{
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        System.out.println("第二步：設置屬性");
        this.name = name;
    }

    public Man(){
        System.out.println("第一步：初始化");
    }
    public void setup(){
        System.out.println("第七步：MAN被初始化了");
    }
    public void teardown(){
        System.out.println("第十一步：MAN被銷毀了");
    }

    @Override
    public void setBeanName(String s) {
        System.out.println("第三步：設置Bean的名稱"+s);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("第四步：了解工廠信息");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("第六步：屬性設置後");
    }

    public void run(){
        System.out.println("第九步：執行業務代碼");
    }

    @Override
    public void destroy() throws Exception {
        System.out.println("第十步：執行Spring的銷毀對象");
    }
}

最上方5.中的所說的存在的另一個類：MyBeanPostProcessor.java

package com.imooc.ioc.demo3;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class MyBeanPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String s) throws BeansException {
        System.out.println("第五步：初始化前方法");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(final Object bean, String beanName) throws BeansException {
        System.out.println("第八步：初始化後方法");
        return bean;

    }
}

測試類：SpringDemo3.java

package com.imooc.ioc.demo3;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringDemo3 {

    @Test
    public void demo2(){
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        Man man = (Man) applicationContext.getBean("man");
        man.run();
        applicationContext.close();
    }

}

執行demo2方法，打印結果：

Spring容器中Bean的生命周期