实现策略模式的正确姿势

@Component
public class QueryServiceStrategyFactory implements ApplicationContextAware {
    public static Map<String, IQueryService> strategies = null;
    public static String selectedStrategy = "test1";
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        strategies = applicationContext.getBeansOfType(IQueryService.class);
    }
}
@component("test1")
public class Test implements IqueryService{
}

@component("test2")
public class Testt2 implements IqueryService{
}

@component("tettt")
public class Testt3 implements IqueryService{
}