Spring通过注解优雅实现工厂模式

import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.stereotype.Component;

// 假设存在一个接口和实现类
interface MyServiceInterface {
    void doSomething();
}

class MyServiceImpl implements MyServiceInterface {
    @Override
    public void doSomething() {
        // 实现细节
    }
}

// 使用Spring的FactoryBean接口来创建MyServiceImpl的实例
class MyServiceFactoryBean extends AbstractFactoryBean<MyServiceInterface> {
    @Override
    public Class<?> getObjectType() {
        return MyServiceImpl.class;
    }

    @Override
    protected MyServiceInterface createInstance() throws Exception {
        return new MyServiceImpl();
    }
}

// 将FactoryBean定义为Spring的bean
@Component
public class MyServiceFactoryBeanConfig {
    @Bean
    public MyServiceFactoryBean myServiceFactoryBean() {
        return new MyServiceFactoryBean();
    }
}