spring boot发送短信服务

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
* Created by jalen on 17-6-1.
*/
@Service
public class SmsService {
    @Autowired
    RestTemplate restTemplate;
    @Value("${sms.username}")
    String username;
    @Value("${sms.password}")
    String password;
    @Value("${sms.url}")
    String url;

    public String sendMsg(String phoneNum,String text){
        if (text.getBytes().length<=500){
            String postUrl = url + "xxxx";

            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

            MultiValueMap p = new LinkedMultiValueMap<>();
            p.add("userId",username);
            p.add("password",password);
            p.add("pszMobis",phoneNum);
            p.add("pszMsg",text);

            HttpEntity< MultiValueMap> entity = new HttpEntity< MultiValueMap>(p,headers);

            String result = restTemplate.postForObject(postUrl,entity,String.class);

            return result;
        }else {
            String result = "短信内容过长，请重新编辑";
            return result;
        }
    }

}

2.看注入的属性RestTemplate对象实在哪里实例化的，这里实在spring boot入口Application处设置的bean

import com.xxx.repository.support.CustomRepository;
import com.ulisesbocchio.jasyptspringboot.annotation.EnableEncryptableProperties;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
//@EnableEncryptableProperties    //启用配置文件加密Encrypt
@EnableJpaAuditing
//@EnableCaching      //启用Ehcache缓存
@EnableJpaRepositories(repositoryBaseClass = CustomRepository.class)
public class Application {

  @Bean
  RestTemplate restTemplate(){
      return new RestTemplate();
  }

  public static void main(String[] args) {
      SpringApplication.run(Application.class, args);
  }
}

3.@Value("${sms.username}")中值的获取，在配置文件yml中设置的

sms:
  username: xxxx
  password: xxxx
  url: http://xx.xx.xx.xx:8086/xx/xx.asmx/