巧用Reflections库实现包扫描

1.需求

需要扫描某个包中的某个接口的实现类的需求

2.maven 依赖引入

<dependency>
    <groupId>org.reflections</groupId>
    <artifactId>reflections</artifactId>
    <version>0.9.11</version>
</dependency>

3.扫描org.fhp.test.entity包下的MyInterface的子类

public void testReflections() {
        Reflections reflections = new Reflections("org.fhp.test.entity");
        Set<Class<? extends MyInterface>> classes = reflections.getSubTypesOf(MyInterface.class);
 
        for(Class clazz : classes) {
            //logger.info(clazz.getName());
            System.out.println("Found: " + clazz.getName());
        }
    }

4.如果要扫描整个工程的类

假如想扫描整个工程的类，直接new一个不带参数的Reflections就好。值得一提的是，这东西在扫描的时候，连依赖的jar包都不放过。以Spring框架的BeanFactory为例：

public void testReflections() {
        Reflections reflections = new Reflections();
        Set<Class<? extends BeanFactory>> classes = reflections.getSubTypesOf(BeanFactory.class);
 
        for(Class clazz : classes) {
            //logger.info(clazz.getName());
            System.out.println("Found: " + clazz.getName());
        }
    }