public static String uploadFile2OSS(InputStream instream, String fileName) throws IOException {        String imageName = null;        OSSClient ossClient = null;        try {            ClientConfiguration conf = new ClientConfiguration();            // 请求超时时间设置            conf.setConnectionTimeout(5000);            // 请求失败重试次数            conf.setMaxErrorRetry(3);            // 创建上传Object的Metadata，该类为阿里云文件上传内部类，可在里面配置一些基本信息，具体参见源码            ObjectMetadata objectMetadata = new ObjectMetadata();            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            ossClient = new OSSClient(ENDPOINT, ACCESS_KEY_ID, ACCESS_KEY_SECRET);//ENDPOINT：服务器地址，KEY_ID和KEY_SECERT为阿里云颁发的Access Id/Access Key，用于连接服务器            PutObjectResult putResult = ossClient.putObject(BUCKET_NAME, fileName, instream, objectMetadata);//BUCKET_NAME为文件上传路径，instream为文件流，            String ret = putResult.getETag();            if (!"".equals(ret)) {                imageName = fileName;            }        } finally {            if (ossClient != null) {                ossClient.shutdown();            }            try {                if (instream != null) {                    instream.close();                }            } catch (IOException e) {                e.printStackTrace();                return null;            }        }        return imageName;    }

 

ClientConfiguration客户端配置选项，例如代理设置，用户代理字符串，最大重试次数等。

OSSClient：阿里云文件上传类，