// Initialize TransferConfig. The default configuration is used here. If you need to customize it, 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 size threshold using the following code.
TransferConfig transferConfig = new TransferConfig.Builder()
        // Set the minimum object size to enable 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);
// Configure server-side encryption (SSE-COS) using COS-managed encryption keys 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);

// Configure server-side encryption (SSE-KMS) using a customer-provided Customer Master Key (CMK) 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);
// Configure server-side encryption (SSE-C) using a customer-provided encryption key to protect data.
try {
    putObjectRequest.setCOSServerSideEncryptionWithCustomerKey(customKey);
} catch (CosXmlClientException e) {
    e.printStackTrace();
}

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