spring装配注解（IOC容器加载控制）ComponentScan及ComponentScans使用

　　ComponentScan，只写入value，可扫描路径下装配的@Contrller、@Service、@Repository

@ComponentScan(value = "com.test")

测试类：

@Test
    @SuppressWarnings("resource")
    public void test01() {
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(
                MainConfig.class);

        String[] definitionNames = applicationContext.getBeanDefinitionNames();//获取spring装配的bean

        for (String name : definitionNames) {
            System.out.println(name);
        }
    }

ComponentScan中还有参数excludeFilters、includeFilters、useDefaultFilters

ANNOTATION, // 按照注解 比如Controller Service
ASSIGNABLE_TYPE,// 按照给定的类型 比如某个类 like this

CUSTOM，//自定义验证

其中excludeFilters是设置屏蔽，excludeFilters可通过设置type进行过滤，classes进行详细的排除。其中使用方法如下：

@ComponentScan(value = "com.test", excludeFilters = 
{ @Filter(type = FilterType.ASSIGNABLE_TYPE ,
        classes={BookService.class,Book.class}) })

通过注解类型屏蔽BookService及Book类

1 @ComponentScan(value = "com.test", excludeFilters = 
2 { @Filter(type = FilterType.ASSIGNABLE_TYPE ,
3         classes={BookService.class,Book.class}) })

 通过注解类型屏蔽service，controller

@ComponentScan(value = "com.test", excludeFilters = 
{ @Filter(type = FilterType.ANNOTATION ,
        classes={Controller.class,Service.class}) })

而includeFilters是设置非屏蔽，只装配自己设定的类，要注意的是，在使用是要将useDefaultFilters关闭，默认时开启的。

只装配配置了service，controller的类

@ComponentScan(value = "com.test", useDefaultFilters=false,includeFilters = 
{ @Filter(type = FilterType.ANNOTATION ,
        classes={Controller.class,Service.class}) })

 ComponentScans的使用就更明了，里面放的是多个ComponentScan，直接放进去就可以直接使用

@ComponentScans(
value={
        @ComponentScan(value = "com.test", useDefaultFilters=false,includeFilters = 
            { @Filter(type = FilterType.ANNOTATION ,
                    classes={Controller.class}) })
}
        )

 CUSTOM自定义验证，需要我们写一个类，去实现TypeFilter的方法，下面测试类，对className中包含了“ser”的允许装配进容器

public class MyTypeFilter implements TypeFilter {

    public boolean match(MetadataReader metadataReader,
            MetadataReaderFactory metadataReaderFactory) throws IOException {
        // TODO Auto-generated method stub
//        获取当前类注解的信息
        AnnotationMetadata annotationMetadata=metadataReader.getAnnotationMetadata();
        //获取当前正在扫描的类信息
        ClassMetadata classMetadata=metadataReader.getClassMetadata();
        //获取当前类资源（类的路径）
        Resource resource=metadataReader.getResource();
        
        String className=classMetadata.getClassName();
        
        System.out.println("--->"+className);
        if(className.contains("ser")){
            return true;
        }
        
        return false;
    }

}

@ComponentScans(value={@ComponentScan
        (value = "com.test", useDefaultFilters=false,
        includeFilters = {@Filter(type=FilterType.CUSTOM ,classes={MyTypeFilter.class})}
        )}
        )