《读spring源码》9注解@ComponentScan 中useDefaultFilters中默认扫描是如何扫描的

蔚落 2023-06-18 04:50 35阅读 0赞

package com.enjoy.cap2.MainConfiguer;
    
    
    import com.enjoy.cap1.Person;
    import com.enjoy.cap2.controller.OderController;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.FilterType;
    import org.springframework.stereotype.Controller;
    import org.springframework.stereotype.Service;
    
    @Configuration
    @ComponentScan(value = "com.enjoy.cap2",includeFilters  = { 
                @ComponentScan.Filter(type = FilterType.CUSTOM,classes = { MYTyperFilter.class})
        },useDefaultFilters = false)//扫描组件
    public class MainConfig { 
        @Bean
        public Person person1(){ 
            return new Person("张三",22);
        }
    }

在5的时候我们知道 useDefaultFilters = true的时候会扫描所有的注解到容器，那么具体是怎么扫描的呢？  
我们先看一下测试用例：

package test;
    
    import com.enjoy.cap2.MainConfiguer.MainConfig;
    import org.junit.jupiter.api.Test;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class MainTEwst { 
    
        @Test
        public void sss(){ 
            AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
            String[] beanDefinitionNames = annotationConfigApplicationContext.getBeanDefinitionNames();
            for(String name:beanDefinitionNames){ 
                System.out.println(name);
            }
        }
    }

我么跟一下容器代码。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 1]  
![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][20191130093540688.png]

![在这里插入图片描述][20191130093619612.png]  
![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]

![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][20191130094259107.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 6]

![在这里插入图片描述][201911300945356.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 7]  
useDefaultFilters 看到了 如果useDefaultFilters 为true  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 8]

this.includeFilters.add(new AnnotationTypeFilter(Component.class));

只要包含@Component都会被扫描进容器

然后我们看看看 @Controller@Service@Repository都包含Component所以都会被加载进入容器

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][20191130095239874.png]  
![在这里插入图片描述][20191130095304492.png]

这就是在include的时候useDefaultFilters 为true的话 所有都会加载进来。

还可以用eccludefilter进行排除。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/201911300927002.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/20191130093313747.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/20191130093514302.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[20191130093540688.png]: https://img-blog.csdnimg.cn/20191130093540688.png
[20191130093619612.png]: https://img-blog.csdnimg.cn/20191130093619612.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191130093738737.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/20191130093817973.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/2019113009395212.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[20191130094259107.png]: https://img-blog.csdnimg.cn/20191130094259107.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20191130094402902.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[201911300945356.png]: https://img-blog.csdnimg.cn/201911300945356.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw_size_16_color_FFFFFF_t_70 7]: https://img-blog.csdnimg.cn/2019113009462774.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 8]: https://img-blog.csdnimg.cn/20191130094757465.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 9]: https://img-blog.csdnimg.cn/20191130095219348.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Bwd3dw,size_16,color_FFFFFF,t_70
[20191130095239874.png]: https://img-blog.csdnimg.cn/20191130095239874.png
[20191130095304492.png]: https://img-blog.csdnimg.cn/20191130095304492.png