SpringBoot使用@Value读取属性值

@Component
public class PayUtil {

    @Value("${nuonuo.app_key}")
    public String appKey;

    @Value("${nuonuo.app_secret}")
    public String appSecret;
}

@SpringBootTest(classes = HelloApplication.class)
@RunWith(SpringRunner.class)
public class Test1 {

    @Autowired
    PayUtil payUtil;

    @Test
    public void test() {
        System.out.println("---"+payUtil.appKey);
    }
}

@Component
public class PayUtil {
    
    public static String appKey;
    public static String appSecret;
    
    @Value("${nuonuo.app_key}")
    public void setAppKey(String app_key) {
        appKey = app_key;
    }

    @Value("${nuonuo.app_secret}")
    public void setAppSecret(String app_secret) {
        appSecret = app_secret;
    }
}

@SpringBootTest(classes = HelloApplication.class)
@RunWith(SpringRunner.class)
public class Test1 {
    @Test
    public void test() {
        System.out.println("---"+PayUtil.appKey);
    }
}

1. 直接在静态变量上加@Value无效；
2. 给变量赋值要交给Spring容器管理，也就是需要在类上加@Component注解；