SpringBoot @ComponentScan

墨蓝 2023-01-06 01:23 149阅读 0赞

# @ComponentScan #

@ComponentScan主要就是定义**扫描的路径**从中找出标识了**需要装配**的类自动装配到spring的bean容器中

@Controller，@Service，@Repository，@Configuration注解有一个**共同的注解@Component**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70]

@ComponentScan注解默认就会装配标识了@Controller，@Service，@Repository，@Configuration，@Component注解的类到spring容器中

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70 1]

测试：

import com.lyh.Application;
    import org.junit.jupiter.api.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    import org.springframework.test.context.junit4.SpringRunner;
    
    
    @RunWith(SpringRunner.class)
    @SpringBootTest(classes = Application.class)
    public class test { 
    
        @Test
        public void run1(){ 
            AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(Application.class);
            //AnnotationConfigApplicationContext可以实现基于Java的配置类加载Spring的应用上下文
            
            String[] definitionNames = applicationContext.getBeanDefinitionNames();
            for (String name : definitionNames) { 
                System.out.println(" -- " +name);
            }
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70 2]

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