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package ftp;
import gui.image.FTPDownloader_GUI;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import javax.swing.JOptionPane;
import javax.swing.SwingWorker;
/**
* Execute file download in a background thread and update the progress.
* @author www.codejava.net
*
*/
public class DownloadTask extends SwingWorker<Void, Void> {
private static final int BUFFER_SIZE = 4096;
private String host;
private int port;
private String username;
private String password;
private String downloadPath;
private String saveDir;
@SuppressWarnings("unused")
private FTPDownloader_GUI gui;
public DownloadTask(String host, int port, String username,
String password, String downloadPath, String saveDir,
FTPDownloader_GUI gui) {
this.host = host;
this.port = port;
this.username = username;
this.password = password;
this.downloadPath = downloadPath;
this.saveDir = saveDir;
this.gui = gui;
}
/**
* Executed in background thread
*/
@Override
protected Void doInBackground() throws Exception {
FTPUtility util = new FTPUtility(host, port, username, password);
try {
util.connect();
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
long totalBytesRead = 0;
int percentCompleted = 0;
long start=System.nanoTime();
final double NANOS_PER_SECOND = 1000000000.0;
final double BYTES_PER_MIB = 1024*1024;
long fileSize = util.getFileSize(downloadPath);
//gui.setFileSize(fileSize);
String fileName = new File(downloadPath).getName();
File downloadFile = new File(saveDir + File.separator + fileName);
FileOutputStream outputStream = new FileOutputStream(downloadFile);
util.downloadFile(downloadPath);
InputStream inputStream = util.getInputStream();
while ((bytesRead = inputStream.read(buffer)) != -1 && isCancelled()==false) {
outputStream.write(buffer, 0, bytesRead);
totalBytesRead += bytesRead;
//System.out.println(totalBytesRead);
double speed = NANOS_PER_SECOND / BYTES_PER_MIB * totalBytesRead / (System.nanoTime() - start + 1);
percentCompleted = (int) (totalBytesRead * 100 / fileSize);
setProgress(percentCompleted);
firePropertyChange("speed", 0, speed);
firePropertyChange("filesize", 0,fileSize);
firePropertyChange("bytesread", 0,totalBytesRead);
}
outputStream.close();
util.finish();
} catch (FTPException ex) {
JOptionPane.showMessageDialog(null, "Error downloading file: " + ex.getMessage(),
"Error", JOptionPane.ERROR_MESSAGE);
ex.printStackTrace();
setProgress(0);
cancel(true);
} finally {
util.disconnect();
}
return null;
}
/**
* Executed in Swing's event dispatching thread
*/
@Override
protected void done() {
if (!isCancelled()) {
JOptionPane.showMessageDialog(null,
"File has been downloaded successfully!", "Message",
JOptionPane.INFORMATION_MESSAGE);
}
}
}
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