Object Storage Service:Download objects as local files using OSS SDK for Android

Usage notes

• Before you run the sample code in this topic, you must create an OSSClient instance by using methods such as using a custom domain name or Security Token Service (STS). For more information, see Initialization.

Permissions

By default, an Alibaba Cloud account has full permissions. RAM users or RAM roles under an Alibaba Cloud account do not have any permissions by default. The Alibaba Cloud account or account administrator must grant operation permissions through RAM Policy or Bucket policies.

Example

The following code provides an example on how to download a specific object to a local computer:

// Construct an object download request. 
// Specify the name of the bucket and the full path of the object. In this example, the bucket name is examplebucket and the full path of the object is exampledir/exampleobject.txt. Do not include the bucket name in the full path. 
GetObjectRequest get = new GetObjectRequest("examplebucket", "exampledir/exampleobject.txt");

oss.asyncGetObject(get, new OSSCompletedCallback<GetObjectRequest, GetObjectResult>() {
    @Override
    public void onSuccess(GetObjectRequest request, GetObjectResult result) {
// Start reading data. 
        long length = result.getContentLength();
        if (length > 0) {
            byte[] buffer = new byte[(int) length];
            int readCount = 0;
            while (readCount < length) {
                try{
                    readCount += result.getObjectContent().read(buffer, readCount, (int) length - readCount);
                }catch (Exception e){
                    OSSLog.logInfo(e.toString());
                }
            }
    // Specify the full path of the downloaded object. Example: D:\\localpath\\exampleobject.jpg. 
            try {
                FileOutputStream fout = new FileOutputStream("download_filePath");
                fout.write(buffer);
                fout.close();
            } catch (Exception e) {
                OSSLog.logInfo(e.toString());
            }
        }
    }

    @Override
    public void onFailure(GetObjectRequest request, ClientException clientException,
                          ServiceException serviceException)  {

    }
});

References

• For the complete sample code that is used to download an object to a local computer, visit GitHub.

• For more information about the API operation that you can call to download an object to a local computer, see GetObject.

• For more information about how to initialize an OSSClient instance, see Initialization.