@Autowired注入Map,List

@Autowired源码

@Target({ElementType.CONSTRUCTOR, ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Autowired {

   /**
    * Declares whether the annotated dependency is required.
    * <p>Defaults to {@code true}.
    */
   boolean required() default true;

}

其中@Target中有写他可以支持的地方

• ElementType.CONSTRUCTOR 构造函数
• ElementType.METHOD 方法
• ElementType.PARAMETER 参数
• ElementType.FIELD 字段声明（包括枚举常量）
• ElementType.ANNOTATION_TYPE 注解类型声明

这里我们用到@Autowired的ElementType.FIELD注入到Map上

public interface OrderService {
}

@Service
public class MeituanOrderServiceImpl implements OrderService{
}

@Service
public class ElemeOrderServiceImpl implements OrderService{
}

@SpringBootApplication
public class DemoApplication {

    @Autowired
    public Map<String, OrderService> map;
    
    @Bean
    public void test(){
        System.out.println(map);
    }
    
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);

    }
}

Debug一下