The library cab be used to perform file system operations, currently it support AWS S3 and SFTP related operations.

How you can use it:

Maven

<dependency>
  <groupId>com.github.ramalapure</groupId>
  <artifactId>filesystem</artifactId>
  <version>1.1</version>
</dependency>

Gradle

implementation 'com.github.ramalapure:filesystem:1.1'

Let's see the configuration and how to get the instance of file system.

for AWS S3 file system:

Map<String, Object> properties = new HashMap<>();
properties.put(AppConstants.S3_ACCESS_KEY, "REPLACE_AWS_ACCESS_KEY");
properties.put(AppConstants.S3_SECRET_KEY, "REPLACE_AWS_SECRET_KEY");
properties.put(AppConstants.REGION, "REPLACE_REGION");
properties.put(AppConstants.S3_BUCKET_NAME, "REPLACE_BUCKET_NAME");
Configuration config = new Configuration(AppConstants.STR_S3, properties);
FileSystem fileSystem = FileSystemFactory.getFileSystem(config);

for SFTP file system:

Map<String, Object> properties = new HashMap<>();
properties.put(AppConstants.SFTP_USERNAME, "REPLACE_SFTP_USERNAME");
properties.put(AppConstants.SFTP_PASSWORD, "REPLACE_SFTP_PSWD");
properties.put(AppConstants.SFTP_HOSTNAME, "REPLACE_SFTP_HOST"); 
// port value must be integer
properties.put(AppConstants.SFTP_PORT, REPLACE_SFTP_PORT);
Configuration config = new Configuration(AppConstants.STR_SFTP, properties);
FileSystem fileSystem = FileSystemFactory.getFileSystem(config);

The AWS S3 file system supports following operations on bucket:

1. Create new bucket

   // As creating a bucket is not directly available in file system interface 
   // we need to get the actual instance of S3 client.
   AwsS3Client client = (AwsS3Client) fileSystem;
   client.createBucket("REPLACE_WITH_BUCKET_NAME");
   

2. Get list of buckets

   // As list of buckets is not directly available in file system interface 
   // we need to get the actual instance of S3 client.
   AwsS3Client client = (AwsS3Client) fileSystem;
   List<String> listOfBuckets = client.getListOfBuckets();
   

3. Get list of files from specific folder or bucket

   // Empty string will return all the objects/files from buckets
   List<String> files = fileSystem.getListOfFiles("");
   //OR you can get files from only specific folder
   List<String> files = fileSystem.getListOfFiles("/specific-folder");
   

4. Upload file/object to bucket

   File file = new File("THE_FILE_YOU_WANT_TO_UPLOAD");
   fileSystem.uploadFile(new FileInputStream(file), "FILE_KEY");
   

5. Read input stream of file from bucket

   InputStream inputStream = fileSystem.read("FILE_KEY");
   

6. Download the file from bucket to local system

   fileSystem.downloadFile("FILE_KEY_TO_DOWNLOAD_FROM_BUCKET", "FILE_NAME_TO_SAVE_ON_LOCAL_SYSTEM");
   

7. Create folder in bucket

   fileSystem.createFolder("FOLDER_NAME");
   

8. Delete file from bucket

   fileSystem.deleteFile("FILE_KEY");
   

9. Copy file/object from one folder to another in same bucket

   fileSystem.copyFile("SOURCE_FILE_KEY", "TARGET_FILE_KEY");
   

10. Delete the bucket with objects and versions

    // As deleting a bucket is not directly available in file system interface 
    // we need to get the actual instance of S3 client.
    AwsS3Client client = (AwsS3Client) fileSystem;
    client.deleteBucket("BUCKET_NAME");
    

The SFTP file system supports following operations on directory/file:

1. Get list of files

   // Empty string will return all the files
   List<String> files = fileSystem.getListOfFiles("");
   //OR you can get files from only specific folder
   List<String> files = fileSystem.getListOfFiles("/specific-folder");
   

2. Upload file

   File file = new File("THE_FILE_YOU_WANT_TO_UPLOAD");
   fileSystem.uploadFile(new FileInputStream(file), "FILE_KEY");
   

3. Read input stream of file

   InputStream inputStream = fileSystem.read("FILE_NAME_WITH_PATH");
   

4. Download file to local system

   fileSystem.downloadFile("FILE_NAME_TO_DOWNLOAD_FROM_DIRECTORY", "FILE_NAME_TO_SAVE_ON_LOCAL_SYSTEM");
   

5. Create new folder

   fileSystem.createFolder("FOLDER_NAME");
   

6. Delete file/directory

   fileSystem.deleteFile("FILE_NAME_WITH_PATH");
   

7. Copy file from one folder to another

   fileSystem.copyFile("SOURCE_FILE_NAME_WITH_PATH", "TARGET_FILE_NAME_WITH_PATH");