// Initialize TransferConfig with the default configuration. For customization, see the SDK API documentation.
// By default, files larger than or equal to 2 MB are automatically uploaded in parts, with a part size of 1 MB. You can modify the part threshold using the following code.
TransferConfig transferConfig = new TransferConfig.Builder()
        // Set the minimum object size for enabling multipart upload. The default is 2 MB.
        .setDivisionForUpload(2097152)
        // Set the part size for multipart upload. The default is 1 MB.
        .setSliceSizeForUpload(1048576)
        // Set whether to force simple upload and disable multipart upload.
        .setForceSimpleUpload(false)
        .build();
// Initialize TransferManager
TransferManager transferManager = new TransferManager(cosXmlService,
        transferConfig);

PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, cosPath, srcPath);
// Enable server-side encryption with COS-managed encryption keys (SSE-COS) to protect data.
putObjectRequest.setCOSServerSideEncryption();

// Upload documents.
COSXMLUploadTask cosxmlUploadTask = transferManager.upload(putObjectRequest, uploadId);

// Server-side encryption keys
String customKey = "Customer Master Key (CMK)";
String encryptContext = "Encryption Context";
PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, cosPath, srcPath);

// Enable server-side encryption with customer-provided customer master keys (SSE-KMS) to protect data.
try {
    putObjectRequest.setCOSServerSideEncryptionWithKMS(customKey, encryptContext);
} catch (CosXmlClientException e) {
    e.printStackTrace();
}
// Upload documents.
COSXMLUploadTask cosxmlUploadTask = transferManager.upload(putObjectRequest, uploadId);

// Server-side encryption keys
String customKey = "Server-side encryption key";
PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, cosPath, srcPath);
// Enable server-side encryption with customer-provided encryption keys (SSE-C) to protect data.
try {
    putObjectRequest.setCOSServerSideEncryptionWithCustomerKey(customKey);
} catch (CosXmlClientException e) {
    e.printStackTrace();
}

// Upload documents.
COSXMLUploadTask cosxmlUploadTask = transferManager.upload(putObjectRequest, uploadId);