public void uploadFile(String filePath, byte[] data) throws IOException {
login();
OutputStream os = ftpClient.storeFileStream(filePath);
int ftpUploadReplyCode = ftpClient.getReplyCode();
if (FTPReply.isNegativePermanent(ftpUploadReplyCode)) {
throw new IOException("SERVER FTP:REQUEST DENIED");
} else if (FTPReply.isNegativeTransient(ftpUploadReplyCode)) {
uploadFile(filePath, data);
}
ByteArrayInputStream bais = new ByteArrayInputStream(data);
IOUtils.copy(bais, os);
bais.close();
os.flush();
os.close();
if (!ftpClient.completePendingCommand()) {
uploadFile(filePath, data);
}
logout();
}
/**
* Method that downloads a file from the FTP server.
*
* @param filepath is the absolute path of the file in the FTP server
* @return the file content as byte[]
* @throws IOException if an i/o error occurs.
*/
public byte[] downloadFile(String filepath) throws IOException {
login();
FTPFile ftpFile = ftpClient.listFiles(filepath)[0];
// file exists on FTP server?
if (ftpFile == null) {
throw new IOException("NULL FILE POINTER IN THE FTP SERVER");
}
// file is a directory?
if (ftpFile.isDirectory()) {
throw new IOException("FILE POINTER IS A DIRECTORY");
}
// its a file and exists. start download stream...
InputStream is = ftpClient.retrieveFileStream(filepath);
// how the server replied to the fetch command?
int ftpReplyCode = ftpClient.getReplyCode();
// denied?
if (FTPReply.isNegativePermanent(ftpReplyCode)) {
throw new IOException("SERVER FTP:REQUEST DENIED");
// can we try again?
} else if (FTPReply.isNegativeTransient(ftpReplyCode)) {
// close the already open stream before try again...
if (is != null) {
is.close();
}
return downloadFile(filepath);
}
// server accepted the command
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// copying the file
IOUtils.copy(is, baos);
// closing open streams
is.close();
baos.flush();
baos.close();
// transaction is successful?
boolean transactionCompleted = ftpClient.completePendingCommand();
if (!transactionCompleted) {
return downloadFile(filepath);
}
// we got the file
logout();
return baos.toByteArray();
}
