《读spring源码》15 Bean的生命周期简单探索（单实例）

我就是我 2023-06-18 07:54 1阅读 0赞

之前的版本中 bean 是可以在xml文件中 配置bean的初始化和销毁的method

接下来自己模拟一个创建–》 初始化 --》销毁的流程

package com.enjoy.cap7;
    
    public class Bike { 
        public Bike(){ 
            System.out.println("Bike constructor ………………");
        }
        public void init(){ 
            System.out.println("Bike init ……………………");
        }
        public void destory(){ 
            System.out.println("Bike destory…………………");
        }
    
    }

package com.enjoy.cap7;
    
    
    import com.enjoy.cap1.Person;
    import com.enjoy.cap6.*;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Import;
    
    @Configuration
    @Import(value = { Dog.class,Cat.class,TTTTImportSelector.class,TTTImportBeanDefinitionRegistrar.class})
    public class MainConfig { 
    
        @Bean("person")
        public Person zhangsan(){ 
            System.out.println("给我们的容器中添加张三");
            return new Person("张三",22);
        }
        @Bean(initMethod = "init",destroyMethod = "destory")
        public Bike bike(){ 
            return new Bike();
        }
    
    
    }

package test;
    
    import com.enjoy.cap7.MainConfig;
    import org.junit.jupiter.api.Test;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    /** * FactoryBean 和 BeanFactorty 有什么区别？ * * FactoryBean ：可以把我们的JAVA实例通过FactoryBean注入到容器中 * * BeanFactorty：从我们的容器中获取实例化后的bean * */
    public class MainTEwst7 { 
    
        @Test
        public void sss(){ 
            AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
            System.out.println("容器起用完成");
    
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70]  
在默认情况下spring创建bean是单例模式，单例模式在创建容器的同事加入bean实例。  
如上打印结果我们可以到打印出了 bean的新建 初始化的时候的打印日志

当我们再test用例里面加入如下一句话 就是关闭容器的时候 ：

annotationConfigApplicationContext.close();

打印日志如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 1]  
我们可以看到日志中打印了destory的执行日志（当然这只是一个演示）

那么我们看一下close方法  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 2]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 4]  
销毁缓存中所有的**单例**的bean  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 6]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191201095123130.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191201095332108.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191201095549877.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191201095737487.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20191201095821786.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/201912010959485.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/2019120110003146.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70