POM

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>3.8.0</version>
</dependency>

Java

public class UploadSample {
    private static String endpoint = "<endpoint, http://oss-cn-hangzhou.aliyuncs.com>";
    private static String accessKeyId = "<accessKeyId>";
    private static String accessKeySecret = "<accessKeySecret>";
    private static String bucketName = "<bucketName>";
    // 下载用的路径名
    private static String key = "<downloadKey>";
    private static String uploadFile = "<uploadFile>";
    public static void main(String[] args) throws IOException {        
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        try {
            UploadFileRequest uploadFileRequest = new UploadFileRequest(bucketName, key);
            // The local file to upload---it must exist.
            uploadFileRequest.setUploadFile(uploadFile);
            // Sets the concurrent upload task number to 5.
            uploadFileRequest.setTaskNum(5);
            // Sets the part size to 1MB.
            uploadFileRequest.setPartSize(1024 * 1024 * 1);
            // Enables the checkpoint file. By default it's off.
            uploadFileRequest.setEnableCheckpoint(true);
            UploadFileResult uploadResult = ossClient.uploadFile(uploadFileRequest);
            CompleteMultipartUploadResult multipartUploadResult = 
                    uploadResult.getMultipartUploadResult();
            System.out.println(multipartUploadResult.getETag());
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message: " + oe.getErrorMessage());
            System.out.println("Error Code:       " + oe.getErrorCode());
            System.out.println("Request ID:      " + oe.getRequestId());
            System.out.println("Host ID:           " + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ce.getMessage());
        } catch (Throwable e) {
            e.printStackTrace();
        } finally {
            ossClient.shutdown();
        }
    }
}

参考资料

• https://help.aliyun.com/document_detail/52834.html