import com.aliyun.oss.HttpMethod;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.GeneratePresignedUrlRequest;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectResult;

// OSS所在服务区地址（在所购买的OSS存储对象空间信息中会有，一般也就是杭州的）
private static String endpoint="https://oss-cn-hangzhou.aliyuncs.com";
// OSS对象存储空间访问身份验证账户和密钥
private static String accessKeyId="*************";
private static String accessKeySecret="********************";
// OSS对象存储空间名
private static String bucketName="*********************";
// OSS存储空间中的文件目录
private static String fileDir = "***/***/";

private OSSClient ossClient;

public OSSUpload1() {
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

/**
 * @Author qtl
 * @Description 同步上传
 * @Date 18:31 2020/10/14
 * @Param [file]
 * @return java.lang.String
 **/
public String uploadImg2Oss(MultipartFile file) {
    // 获取文件名
    String originalFilename = file.getOriginalFilename();
    String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
    Random random = new Random();
    String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
    try {
        InputStream inputStream = file.getInputStream();
        this.uploadFile2OSS(inputStream, name);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return name;
}

/**
 * @Author qtl
 * @Description 上传到OSS服务器 如果同名文件会覆盖服务器上的,因此在文件命名上采用时间戳（毫秒级）来命名上传成功的文件
 * @Date 10:55 2020/9/16
 * @Param [instream, fileName]
 * @return java.lang.String
 **/
public String uploadFile2OSS(InputStream instream, String fileName) {
    String ret = "";
    try {
        // 创建上传Object的Metadata
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentLength(instream.available());
        objectMetadata.setCacheControl("no-cache");
        objectMetadata.setHeader("Pragma", "no-cache");

        objectMetadata.setContentType(getContentType(fileName.substring(fileName.lastIndexOf("."))));
        objectMetadata.setContentDisposition("inline;filename=" + fileName);
        // 上传文件
        PutObjectResult putResult = ossClient.putObject(bucketName, fileDir + fileName, instream, objectMetadata);
        ret = putResult.getETag();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (instream != null) {
                instream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
　　// 这个返回值就是上传成功后在OSS文件对象存储的文件名【例：1607605931087.jpg】
    return ret;
}