从服务中获取提供者的值

// 定义一个服务接口
public interface ServiceProvider {
    String getValue();
}

// 实现服务接口的具体类
@Service
public class ServiceProviderImpl implements ServiceProvider {
    @Override
    public String getValue() {
        return "Provider Value";
    }
}

// 客户端类，通过依赖注入获取服务提供者的实例
@Service
public class ClientService {
    private final ServiceProvider serviceProvider;

    // 使用构造器注入
    @Autowired
    public ClientService(ServiceProvider serviceProvider) {
        this.serviceProvider = serviceProvider;
    }

    public void printProviderValue() {
        System.out.println(serviceProvider.getValue());
    }
}

// 主类，用于启动Spring应用上下文
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        ApplicationContext context = SpringApplication.run(Application.class, args);
        ClientService clientService = context.getBean(ClientService.class);
        clientService.printProviderValue();
    }
}