checking a file starts with a name in ftp location using java

Question

Before downloading a file needs check whether the file(file name starts) exist or not: I had a ftp location, it will generate a file in response to hitting a service(API). I need to check whether file exits or not in ftp location using a starting characters of file name because it will append some data at end of file name. Can any one help on this using java code with commons.net package

Answer 1

Use FTPFileFilter

try {
    String filePattern = "prefix";
    FTPClient objFTPClient = new FTPClient();
    //objFTPClient - set username, password, host, etc...
    FTPFileFilter ftpFileFilter = new FTPFileFilter() {
        @Override
        public boolean accept(FTPFile ftpFile) {
            return ftpFile.getName().toLowerCase().startsWith(filePattern.toLowerCase());
        }
    };
    /* List of file that starts with your given prefix */
    FTPFile[] ftpFiles = objFTPClient.listFiles(remoteDirectory, ftpFileFilter);
}catch(Exception ex){ 
    ex.printStackTrace();
}finally{
    //close connection, etc....
}