Spring @ComponentScan 组件中扫描规则使用场景:
package org.example.cap2.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.FilterType;
import org.example.model.Person;
@Configuration
@ComponentScan(value = "org.example.cap2", includeFilters = {
@Filter(type = FilterType.CUSTOM, classes = MyTypeFilter.class)
}, useDefaultFilters = false)
// includeFilters = Filter[], 指定扫描的时候只需要包含哪些组件
// excludeFilters = Filter[], 指定扫描的时候按照什么规则排除哪些组件
// useDefaultFilters = false, 默认是true 扫描所有组件,要改成false
public class MainConfig2 {
@Bean(value = "abcPerson")
public Person person() {
return new Person("abc", "30");
}
}
自定义扫描规则代码实现:
package org.example.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;
/**
* 新增自定义过滤规则类
*/
public class MyTypeFilter implements TypeFilter {
/**
* @param metadataReader 读取当前正在扫描类的信息
* @param metadataReaderFactory 可以获取到其他任何类信息
* @return
* @throws IOException
*/
@Override
public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory)
throws IOException {
// 获取当前注解类的信息
AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();
// 获取当前正在扫描的类的信息
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("er")) { // 当前类名包含er,则匹配成功
return true;
}
return false;
}
}