依赖

<!-- 七牛云 -->
<dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>7.2.7</version>
</dependency>

配置YUM文件

# 七牛云存储
oss:
  qiniu:
    domain: http://ceshi.clouddn.com/ # 访问域名(查看你存储空间的域名即可)
    accessKey: cEx_Pq1p # 公钥 去密钥管理界面获取
    secretKey: dkZ-n_wFyPmapL # 私钥
    bucketName: chen-file  #存储空间名称

配置类

@Data
@Configuration
public class CloudStorageConfig {

    /**
     * 七牛域名domain
     */
    @Value("${oss.qiniu.domain}")
    private String qiniuDomain;

    /**
     * 七牛ACCESS_KEY
     */
    @Value("${oss.qiniu.accessKey}")
    private String qiniuAccessKey;

    /**
     * 七牛SECRET_KEY
     */
    @Value("${oss.qiniu.secretKey}")
    private String qiniuSecretKey;

    /**
     * 七牛空间名
     */
    @Value("${oss.qiniu.bucketName}")
    private String qiniuBucketName;

}

工具类StringUtil

public class StringUtil {

    /**
     * @Description: 生成唯一图片名称
     * @Param: fileName
     * @return: 云服务器fileName
     */
    public static String getRandomImgName(String fileName) {

        int index = fileName.lastIndexOf(".");

        if ((fileName == null || fileName.isEmpty()) || index == -1) {
            throw new IllegalArgumentException();
        }
        // 获取文件后缀
        String suffix = fileName.substring(index);
        // 生成UUID
        String uuid = UUID.randomUUID().toString().replaceAll("-", "");
        // 生成上传至云服务器的路径
        String path = "duck/" + DateUtil.today() + "-" + uuid + suffix;
        return path;
    }
}

业务实现类

@Service
public class UploadService {

    // 七牛文件上传管理器
    private UploadManager uploadManager;

    private String token;

    // 七牛认证管理
    private Auth auth;

    protected CloudStorageConfig config;

    public UploadService(CloudStorageConfig config) {
        this.config = config;
        init();
    }

    private void init() {
        // 构造一个带指定Zone对象的配置类, 注意这里的Zone.zone0需要根据主机选择，华东、华南等
        uploadManager = new UploadManager(new Configuration(Zone.zone0()));
        auth = Auth.create(config.getQiniuAccessKey(), config.getQiniuSecretKey());
        // 根据命名空间生成的上传token
        token = auth.uploadToken(config.getQiniuBucketName());
    }

    public String uploadQNImg(FileInputStream file, String key) {
        try {
            // 上传图片文件
            Response res = uploadManager.put(file, key, token, null, null);
            if (!res.isOK()) {
                throw new RuntimeException("上传七牛出错：" + res.toString());
            }
            // 解析上传成功的结果
            DefaultPutRet putRet = new Gson().fromJson(res.bodyString(), DefaultPutRet.class);

            String path = config.getQiniuDomain() + "/" + putRet.key;
            // 这个returnPath是获得到的外链地址,通过这个地址可以直接打开图片
            return path;
        } catch (QiniuException e) {
            e.printStackTrace();
        }
        return "";
    }
}

控制器

@Slf4j
@RestController
@RequestMapping("/qiniu")
public class UploadController {

    @Resource
    UploadService uploadService;

    @PostMapping(value = "/image")
    private RespResult upLoadImage(@RequestParam("file") MultipartFile file) throws IOException {

        // 获取文件的名称
        String fileName = file.getOriginalFilename();

        // 使用工具类根据上传文件生成唯一图片名称
        String imgName = StringUtil.getRandomImgName(fileName);

        if (!file.isEmpty()) {

            FileInputStream inputStream = (FileInputStream) file.getInputStream();

            String path = uploadService.uploadQNImg(inputStream, imgName);
            System.out.print("七牛云返回的图片链接:" + path);

            inputStream.close();
            return RespResult.ok(path);
        }
        return RespResult.error();
    }

}