COSClient createCOSClient() {
    // Set user identity information.
    // To view and manage SECRETID and SECRETKEY, please log in to the Access Management Console at https://console.cloud.tencent.com/cam/capi
    // 1. Pass the obtained credentials (secretId, secretKey, sessionToken)
    String secretId = "SECRETID";
    String secretKey = "SECRETKEY";
    COSCredentials cred = new BasicCOSCredentials(secretId, secretKey);

    // ClientConfig contains the client settings for subsequent requests to COS:
    ClientConfig clientConfig = new ClientConfig();

    // Set the bucket region
    // For COS_REGION, please refer to https://cloud.tencent.com/document/product/436/6224
    clientConfig.setRegion(new Region("COS_REGION"));

    // Set the request protocol, either HTTP or HTTPS
    // For versions 5.6.53 and below, it is recommended to use the HTTPS protocol.
    // Version 5.6.54 and higher, HTTPS is used by default.
    clientConfig.setHttpProtocol(HttpProtocol.https);

    // The following settings are optional:

    // Set socket read timeout, default is 30 seconds
    clientConfig.setSocketTimeout(30 * 1000);
    // Set connection establishment timeout, default is 30 seconds
    clientConfig.setConnectionTimeout(30 * 1000);

    // Set the HTTP proxy, IP, and port if needed.
    clientConfig.setHttpProxyIp("httpProxyIp");
    clientConfig.setHttpProxyPort(80);

    // Create a COS client.
    return new COSClient(cred, clientConfig);
}

String bucketName = "examplebucket-1250000000";
// Create a client
COSClient cosClient = createCOSClient();
HeadBucketRequest headBucketRequest = new HeadBucketRequest(bucketName);
HeadBucketResult headBucketResult = cosClient.headBucket(headBucketRequest);
bool isMetaAccBucket = headBucketResult.isMetaAccBucket(); // If metadata acceleration is enabled, isMetaAccBucket is true.

String bucketName = "examplebucket-1250000000";
String key = "test";
// Create a client
COSClient cosClient = createCOSClient();
GetObjectMetadataRequest getObjectMetadataRequest = new GetObjectMetadataRequest(bucketName, key);
ObjectMetadata objectMetadata = cosClient.getObjectMetadata(getObjectMetadataRequest);
boolean isDir = objectMetadata.isFileModeDir();  // If the object is a directory, isDir is true.

String bucketName = "examplebucket-1250000000";
String key = "test";
// Create a client
COSClient cosClient = createCOSClient();
DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(bucket, key);
deleteObjectRequest.setRecursive(true); // Recursively delete the directory
cosClient.deleteObject(deleteObjectRequest);

String bucketName = "examplebucket-1250000000";
String srcKey = "/test/src";
String dstKey = "test/dst"
// Create a client
COSClient cosClient = createCOSClient();
RenameRequest renameRequest = new RenameRequest(bucketName, srcKey, dstKey);
cosClient.rename(renameRequest);

// putObject has an intermediate path
String bucketName = "examplebucket-1250000000";
// An object key is the unique identifier of an object in a bucket.
String key = "/testdemo/test/README.md";

COSClient cosClient = createCOSClient();

// Local file
String localFilePath = "README.md";
File localFile = new File(localFilePath);
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, file);
PutObjectResult putObjectResult = cosClient.putObject(bucketName, key, file);

// Determine whether the intermediate path is a file or a directory
// Intermediate path
dirKey = "/testdemo/test";
GetObjectMetadataRequest getObjectMetadataRequest = new GetObjectMetadataRequest(bucketName, dirKey);
ObjectMetadata objectMetadata = cosClient.getObjectMetadata(getObjectMetadataRequest);  // 404 will be returned for a general bucket here
boolean isDir = objectMetadata.isFileModeDir();   // isDir is true