[开发工具]关于Java一个接口多个实现

一，通过反射工具包

        <!-- 反射工具包 -->
        <dependency>
            <groupId>net.oneandone.reflections8</groupId>
            <artifactId>reflections8</artifactId>
            <version>0.11.7</version>
        </dependency>

@Override
    public void onApplicationEvent(ApplicationReadyEvent applicationReadyEvent) {
        Reflections reflections = new Reflections(AdminApplication.class);
        // 获取一个接口的所有实现类
        Set<Class<? extends AppStartListener>> subTypes = reflections.getSubTypesOf(AppStartListener.class);
        // 循环执行所有实现类的方法 可以用 if(aClass instanceof AAppStartListener) 判断具体是哪个实现
        subTypes.forEach(aClass -> {
            applicationContext.getBean(aClass).onApplicationEvent(applicationReadyEvent);
        });

    }

二，工厂模式

 @Override
    public void onApplicationEvent(ApplicationReadyEvent applicationReadyEvent) {
        applicationContext.getBean(appStartListenerFactory("A").getClass()).onApplicationEvent(applicationReadyEvent);
    }

    public AppStartListener appStartListenerFactory(String platform) {
        if (StringUtils.equals("A", platform)) {
            return new AAppStartListenerImpl();
        } else if (StringUtils.equals("B", platform)) {
            return new BAppStartListenerImpl();
        } else if (StringUtils.equals("C", platform)) {
            return new CAppStartListenerImpl();
        }else {
            return new AppStartListenerImpl();
        }
    }