项目场景：

项目场景：在上传文件至腾讯云OSS时，为了维护方便，在application中建立了tencent云存储相关信息，如下：

tencent:
  appId: xxx
  secretId: xxx
  secretKey: xxx
  region: xxx
  photoBucket: xxx

然后在工具类CosUtil中加上注解@Component，并且在相关参数上加入@Value注解注入值,如下：

@Component
public class CosUtil {
    @Value("${tencent.appId}")
    private static String appId;
    
    @Value("${tencent.secretId}")
    private static String secretId;
    
    @Value("${tencent.secretKey}")
    private static String secretKey;
    
    @Value("${tencent.region}")
    private static String region;
    
    @Value("${tencent.photoBucket}")
    private static String photoBucket;
}
    

在方法中调用参数：

PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, KEY, file.getInputStream(),meta);

        putObjectRequest.setStorageClass(StorageClass.Standard);
        COSClient client = getCosClient();
        try {
            PutObjectResult putObjectResult = client.putObject(putObjectRequest);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 关闭客户端
        client.shutdown();

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问题描述：

方法接收的参数为空，即secretId、secretKey、bucketName都为空，无法正常地完成业务功能。

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原因分析：

springBoot高版本无法使用@Value直接注入值

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解决方案：

在类头加注解@ConfigurationPropertie,并创建set方法，直接在set方法上使用@Value注入配置的值。完美解决问题！

@Component
@ConfigurationProperties(prefix = "tencent",ignoreInvalidFields = true,ignoreUnknownFields = true)
public class CosUtil {
    private static String appId;

    private static String secretId;

    private static String secretKey;

    private static String region;

    private static String photoBucket;

    @Value("${tencent.appId}")
    public void setAppId(String appId) {
        this.appId = appId;
    }
    @Value("${tencent.secretId}")
    public void setSecretId(String secretId) {
        this.secretId = secretId;
    }
    @Value("${tencent.secretKey}")
    public void setSecretKey(String secretKey) {
        this.secretKey = secretKey;
    }
    @Value("${tencent.region}")
    public void setRegion(String region) {
        this.region = region;
    }
    @Value("${tencent.photoBucket}")
    public void setPhotoBucket(String photoBucket) {
        this.photoBucket = photoBucket;
    }
    ..............