我正在开发一个Spring Boot应用程序来发送短信通知。这是我上课的目的。

package org.otp.services;

import org.otp.Configurations;
import com.mashape.unirest.http.HttpResponse;
import org.springframework.stereotype.Component;

import org.springframework.context.annotation.PropertySource;
import org.springframework.context.annotation.PropertySources;

@Component
public class SmsService
{
    private static final Logger LOG = LoggerFactory.getLogger(SmsService.class);

    public String send(String mobile,String msg)
    {
        //Code 
    }
}

这是使用上述类发送通知的类。

package org.otp.controllers;

import org.otp.Constants;
import org.otp.services.EmailService;
import org.otp.services.SmsService;
import org.otp.dto.MessageRequest;
import org.otp.dto.MessageResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestBody;

@Component
public class MessageController {

    private static final Logger LOG = LoggerFactory.getLogger(MessageController.class);

    @Autowired
    SmsService smsService;

    public void sendMessageToAlert(@RequestBody MessageRequest messageRequest)
    {
        String smsStatus = "FAIL";
        MessageResponse messageResponse = new MessageResponse();

         //1. Nullpointer
        smsStatus = smsService.send(messageRequest.getMobileNo(),messageRequest.getMessage());

    }
}

主类

package org.otp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;

@SpringBootApplication
@EnableAsync
public class OtpServiceApplication implements ApplicationRunner
{
    public static void main(String[] args) {
        SpringApplication.run(OtpServiceApplication.class,args);
    }
}

问题是，我在（1）中得到一个 nullpointer异常，说明我的 SmsService 对象为null。而且我的主类在软件包org.otp中，所以这里的两个类都在子软件包下，因此不需要组件扫描。

因此，我很困惑该怎么办。我在这里尝试了许多答案，例如在主类中添加了@Component批注和@ComponentScan，但没有任何效果。有人可以在这里指出我的错误。

谢谢。