@Component
public class ImplementSubformFactory implements ApplicationContextAware {
private static Map<String, ImplementSubformService> productMap = new HashMap<>();
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
//获取ImplementSubformService的所有实现类
Map<String, ImplementSubformService> map = applicationContext.getBeansOfType(ImplementSubformService.class);
for (Map.Entry<String, ImplementSubformService> data : map.entrySet()) {
//在实现类上看有没有使用注解@ImplementSubform
ImplementSubformService subform = data.getValue();
Class<? extends ImplementSubformService> aClass = subform.getClass();
ImplementSubform annotation = AnnotationUtils.findAnnotation(aClass, ImplementSubform.class);
if (null != annotation) {
//有使用,则将注解的type值作为key,实现类作为value存到全局的map中
productMap.put(annotation.type(), subform);
}
}
}
//在业务中,直接根据type值就可以拿到具体实现类,然后就执行具体的代码了
public static ImplementSubformService makeProduct(String name) {
return productMap.get(name);
}
}