Spring的@ComponentScan注解用法介绍

// includeFilters 用法 包含Animal.class类可以被扫描到，包括其子类
@ComponentScan(value = "com.spring"
  includeFilters = {@ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, classes = {Animal.class}
)}
)
// excludeFilters 用法 排除包含@Controller注解的类
@ComponentScan(value = "com.spring"
        , excludeFilters = {
        @ComponentScan.Filter(type = FilterType.ANNOTATION
                , classes = {Controller.class}
        ),
})
// ComponentScans用法
@ComponentScans(
        value = {
                @ComponentScan(value = "com.spring"
                        , includeFilters = {
                        @ComponentScan.Filter(type = FilterType.ANNOTATION
                                , classes = {Controller.class}
                        )
                }, useDefaultFilters = false) ,
                @ComponentScan(value = "com.spring"
                        , excludeFilters = {
                        @ComponentScan.Filter(type = FilterType.ANNOTATION
                                , classes = { Repository.class}
                        )
                })
        }
)*/
// @ComponentScan 
// 针对Java8 语法可以指定多个@ComponentScan，Java8以下可以用 //@ComponentScans() 配置多个规则
@ComponentScan(value = "com.spring"
        , excludeFilters = {
        @ComponentScan.Filter(type = FilterType.ANNOTATION
                , classes = {Controller.class, Controller.class}
        ),
}, includeFilters = {
        @ComponentScan.Filter(type = FilterType.ANNOTATION
                , classes = {Controller.class, Controller.class}
        ),
})

package com.spring.config;
import org.springframework.core.io.Resource;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.ClassMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.TypeFilter;
import java.io.IOException;
/**
 * metadataReader 读取到当前正在扫描的类信息
 * metadataReaderFactory 可以获取到其他任何类的信息
 */
public class TestTypeFilter implements TypeFilter {
    public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {
        //获取当前类注解信息
        AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();
        // 获取当前正在扫描的类信息
        ClassMetadata classMetadata = metadataReader.getClassMetadata();
        // 获取当前类资源信息（比如类的文件路径）
        Resource resource = metadataReader.getResource();
        String className = classMetadata.getClassName();
        System.out.println("类名：" + className);
        if (className.contains("controller")) {
            return true;
        } else {
            return false;
        }
    }
}

package com.spring.test;
import com.spring.config.TestComponentScanConfig;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestComponentScan {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext annotationContext = new AnnotationConfigApplicationContext(TestComponentScanConfig.class);
        String[] names = annotationContext.getBeanDefinitionNames();
        for (String name : names) {
            System.out.println(name);
        }
    }
}