编辑“︁Bean生命周期（Spring框架）”︁（章节）

=== 详细阶段说明 ===
==== 1. 实例化 ====
通过构造器或工厂方法创建Bean实例：
<syntaxhighlight lang="java">
// 等价于 <bean class="com.example.MyBean"/>
public class MyBean {
    public MyBean() {
        System.out.println("1. 实例化");
    }
}
</syntaxhighlight>

==== 2. 属性赋值 ====
Spring通过依赖注入设置属性值：
<syntaxhighlight lang="xml">
<bean class="com.example.MyBean">
    <property name="message" value="Hello"/>
</bean>
</syntaxhighlight>

==== 3. Aware接口回调 ====
若Bean实现了Aware接口，会依次触发：
<syntaxhighlight lang="java">
public class MyBean implements BeanNameAware {
    @Override
    public void setBeanName(String name) {
        System.out.println("3. BeanNameAware: " + name);
    }
}
</syntaxhighlight>

==== 4. 初始化前处理 ====
{{注意|BeanPostProcessor是全局处理器，会作用到所有Bean}}
<syntaxhighlight lang="java">
public class MyPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String name) {
        System.out.println("4. BeforeInit: " + name);
        return bean;
    }
}
</syntaxhighlight>

==== 5. 初始化阶段 ====
按顺序执行三种初始化方式：
* '''@PostConstruct'''注解方法
* '''InitializingBean'''接口的<code>afterPropertiesSet()</code>
* XML中定义的<code>init-method</code>

<syntaxhighlight lang="java">
public class MyBean {
    @PostConstruct
    public void postConstruct() {
        System.out.println("5.1 @PostConstruct");
    }

    public void customInit() {
        System.out.println("5.3 init-method");
    }
}
</syntaxhighlight>

==== 6. 初始化后处理 ====
<syntaxhighlight lang="java">
public class MyPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessAfterInitialization(Object bean, String name) {
        System.out.println("6. AfterInit: " + name);
        return bean;
    }
}
</syntaxhighlight>

==== 7. 销毁阶段 ====
容器关闭时执行销毁操作，顺序与初始化相反：
* '''@PreDestroy'''注解方法
* '''DisposableBean'''接口的<code>destroy()</code>
* XML中定义的<code>destroy-method</code>