Spring生命周期分为以下步骤：

1.instantiate bean 对象实例化

2.populate properties 封装属性

3.如果Bean实现BeanNameAware执行setBeanName

4.如果Bean实现BeanFactoryAware或者ApplicationContextAware设置工厂setBeanFactory或者上下文对象setApplicationContext

5.如果存在类实现BeanPostProcessor执行postProcessorBeforeInitialization

6.如果Bean实现InitializingBean执行afterPropertiesSet

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

8.BeanPostProcessor执行postProcessorAfterInitialization

9.执行业务处理(自己写的方法代码)

10.如果Bean实现DisposableBean执行destroy

11.调用<bean destroy-method="destroy">指定销毁方法

代码示例：

配置文件：applicationContext.xml

 

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：设置属性");        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被销毁了");    }    @Override    public void setBeanName(String s) {        System.out.println("第三步：设置Bean的名称"+s);    }    @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {        System.out.println("第四步：了解工厂信息");    }    @Override    public void afterPropertiesSet() throws Exception {        System.out.println("第六步：属性设置后");    }    public void run(){        System.out.println("第九步：执行业务代码");    }    @Override    public void destroy() throws Exception {        System.out.println("第十步：执行Spring的销毁对象");    }}

 

最上方5.中的所说的存在的另一个类：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：初始化后方法");        return bean;    }}

 

测试类：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();    }}

执行demo2方法，打印结果：