上傳進度條

進度條用於指示上傳或下載的進度。下面的代碼以ossClient.putObject方法為例，介紹如何使用進度條。

public class PutObjectProgressListener implements ProgressListener {
    private long bytesWritten = 0;
    private long totalBytes = -1;
    private boolean succeed = false;
    @Override
    public void progressChanged(ProgressEvent progressEvent) {
        long bytes = progressEvent.getBytes();
        ProgressEventType eventType = progressEvent.getEventType();
        switch (eventType) {
        case TRANSFER_STARTED_EVENT:
            System.out.println("Start to upload......");
            break;
        case REQUEST_CONTENT_LENGTH_EVENT:
            this.totalBytes = bytes;
            System.out.println(this.totalBytes + " bytes in total will be uploaded to OSS");
            break;
        case REQUEST_BYTE_TRANSFER_EVENT:
            this.bytesWritten += bytes;
            if (this.totalBytes != -1) {
                int percent = (int)(this.bytesWritten * 100.0 / this.totalBytes);
                System.out.println(bytes + " bytes have been written at this time, upload progress: " + percent + "%(" + this.bytesWritten + "/" + this.totalBytes + ")");
            } else {
                System.out.println(bytes + " bytes have been written at this time, upload ratio: unknown" + "(" + this.bytesWritten + "/...)");
            }
            break;
        case TRANSFER_COMPLETED_EVENT:
            this.succeed = true;
            System.out.println("Succeed to upload, " + this.bytesWritten + " bytes have been transferred in total");
            break;
        case TRANSFER_FAILED_EVENT:
            System.out.println("Failed to upload, " + this.bytesWritten + " bytes have been transferred");
            break;
        default:
            break;
        }
    }
    public boolean isSucceed() {
        return succeed;
    }
    public static void main(String[] args) {
        // Endpoint以杭州為例，其它Region請按實際情況填寫。
        String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
        // 阿里雲主帳號AccessKey擁有所有API的存取權限，風險很高。強烈建議您建立並使用RAM帳號進行API訪問或日常運維，請登入 https://ram.console.aliyun.com 建立RAM帳號。
        String accessKeyId = "<yourAccessKeyId>";
        String accessKeySecret = "<yourAccessKeySecret>";
        String bucketName = "<yourBucketName>";
        String objectName = "<yourObjectName>";
        // 建立OSSClient執行個體。
        OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
        try {
            // 帶進度條的上傳。
            ossClient.putObject(new PutObjectRequest(bucketName, objectName, new FileInputStream("<yourLocalFile>")).
                    <PutObjectRequest>withProgressListener(new PutObjectProgressListener()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 關閉OSSClient。
        ossClient.shutdown();
    }
}

ossClient.putObject、ossClient.getObject和ossClient.uploadPart方法支援進度條功能。ossClient.uploadFile和ossClient.downloadFile方法不支援進度條功能。

上傳進度條的完整代碼請參見GitHub。