spring使用ExcludeFilter和IncludeFilter

最新推荐文章于 2025-01-13 10:13:28 发布

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本文详细介绍了Spring中@ComponentScan注解的使用，包括如何通过IncludeFilter包含特定类作为Bean，即使该类未标记为@Component。同时，也展示了如何使用ExcludeFilter排除已经标记为@Component的类不被扫描为Bean。示例代码展示了这两种过滤机制的实际应用。

使用IncludeFilter。就算目标类上没有@Component注解，它也会被扫描成为一个Bean

@ComponentScan(value = "com.yzy", 
        includeFilters = {@ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE,classes = {OtherEntity.class})})
@MapperScan(basePackages = "com.yzy.springdemo.dao")
@EnableAspectJAutoProxy
public class SpringAnnotationTest {

}

public class OtherEntity {

}

public class Test {
    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringAnnotationTest.class);
        OtherEntity otherEntity = (OtherEntity) context.getBean("otherEntity");
        System.out.println(otherEntity);//com.yzy.other.OtherEntity@5769e7ae
    }
}

使用ExcludeFilter，就算目标类上面有@Component注解也不会成为Bean

@Component
public class OtherEntity {

}

@ComponentScan(value = "com.yzy",
        excludeFilters = {@ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE,classes = {OtherEntity.class})})
@MapperScan(basePackages = "com.yzy.springdemo.dao")
@EnableAspectJAutoProxy
public class SpringAnnotationTest {

}

public class Test {
    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringAnnotationTest.class);
        OtherEntity otherEntity = (OtherEntity) context.getBean("otherEntity");
        System.out.println(otherEntity);
    }
}