Download free Download Manager Application for Computer
You may download the lightweight java Download Manager Software from following link:
https://drive.google.com/file/d/0B5WYaNmq5rbueUl5bW03VllIc2M/view?usp=sharing
View Source code
import java.awt.Color;
import java.awt.Desktop;
import java.awt.Font;
import java.awt.datatransfer.DataFlavor;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableModel;
public class DownloadManager extends JFrame{
File QueBackup;
boolean cancel=false;
DownloadManager d;
JLabel status;
ArrayList<task> Queue=new ArrayList<>();
ActionListener al;
JLabel DropBox;
long size;
long currentSize;
JButton addTask;
String droppedLink="";
JTable jtb;
DefaultTableModel tableModel;
boolean tableunlocked=true;
public DownloadManager()
{
setSize(288,277);
setLocationRelativeTo(null);
setAlwaysOnTop(true);
setResizable(false);
QueBackup=new File("C:\\OracleConfig\\QueBackup");
getContentPane().setLayout(null);
addTask=new JButton("Add new Download");
this.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
JButton cancelb=new JButton("Cancel a Download");
jtb=new JTable();
String col[] = {"No","Link","FileName","Size", "Completed"};
tableModel = new DefaultTableModel(col, 0);
jtb.setModel(tableModel);
jtb.setDragEnabled(false);
JScrollPane jsp=new JScrollPane();
JButton ShowList=new JButton("Show List");
ShowList.setFont(ShowList.getFont().deriveFont(Font.BOLD,14));
ShowList.setSize(273,30);
DropBox=new JLabel();
try {
if(QueBackup.exists()&&QueBackup.isFile())
{
ObjectInputStream ois=new ObjectInputStream(new FileInputStream(QueBackup));
Queue=(ArrayList<task>)ois.readObject();
ois.close();
}
for(int i=0;i<Queue.size();i++)
{
float flsa=(float)Queue.get(i).size/1000/1000;
float ffff=(float)Queue.get(i).downloaded/1000/1000;
Object[] rowob={i+1,Queue.get(i).address,Queue.get(i).filename,flsa,ffff};
tableModel.addRow(rowob);
}
} catch (Exception ex) {JOptionPane.showMessageDialog(d,ex.getMessage());}
al=new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String btntext=((JButton)e.getSource()).getText();
if(btntext.equals("Cancel a Download"))
{
int intex;
String inputstring=JOptionPane.showInputDialog(d, "Enter the Serial number in Download queue");
try{
intex=Integer.parseInt(inputstring);
if(intex==1)
cancel=true;
else
{
Queue.remove(intex-1);
UpdateTable();
}
status.setText(Integer.toString(intex)+"th Download Cancelled!");
}catch(Exception ex)
{
JOptionPane.showMessageDialog(d, "Enter a valid number between 1 and "+Integer.toString(Queue.size()));
}
}
else if(btntext.equals("Show List"))
{
for(int i=0;i<20;i+=1)
{
setSize(getWidth(),getHeight()+10);
try{Thread.sleep(30);}catch(Exception ex){JOptionPane.showMessageDialog(d,ex.getMessage());}
}
((JButton)e.getSource()).setText("Hide List");
}
else if(btntext.equals("Hide List"))
{
for(int i=0;i<20;i+=1)
{
setSize(getWidth(),getHeight()-10);
try{Thread.sleep(30);}catch(Exception ex){JOptionPane.showMessageDialog(d,ex.getMessage());}
}
((JButton)e.getSource()).setText("Show List");
}
else
{
String t=droppedLink;
if(droppedLink.equals(""))
t=JOptionPane.showInputDialog(d,"Enter address:");
if(t!=null)
{
task temp=new task();
temp.address=t;
droppedLink="";
int j=t.lastIndexOf(".");
String fname;
if(j==-1)
{
if(t.indexOf("googlevideo.com")!=-1)
fname="youtubevideo "+new Date().toString().replaceAll(":"," ")+".mp4";
else fname=new Date().toString().replaceAll(":"," ");
}
else if(t.length()-j>8)
fname=new Date().toString().replaceAll(":"," ");
else
fname=t.substring(t.lastIndexOf("/"));
temp.filename="C:\\OracleConfig\\"+fname;
URL url;
try {
url = new URL(t);
HttpURLConnection ucn=(HttpURLConnection)url.openConnection();
ucn.setRequestMethod("HEAD");
ucn.getInputStream();
temp.size=ucn.getContentLengthLong();
ucn.disconnect();
} catch (Exception ex) {
JOptionPane.showMessageDialog(d, ex.getMessage());
}
Queue.add(temp);
float ttt=(float)temp.size/1000/1000;
String filenamee=temp.filename.substring(temp.filename.lastIndexOf("\\")+1);
tableModel.addRow(new Object[]{Queue.size(),temp.address,filenamee,ttt,0});
}
}
}};
d=this;
cancelb.addActionListener(al);
addTask.addActionListener(al);
status=new JLabel("Starting.");
status.setVerticalAlignment(SwingConstants.CENTER);
status.setHorizontalAlignment(SwingConstants.CENTER);
status.setSize(273,30);
getContentPane().add(status);
status.setLocation(5,5);
addTask.setSize(273,30);
getContentPane().add(addTask);
addTask.setLocation(status.getX(),status.getY()+status.getHeight()+5);
DropBox.setSize(273,100);
DropBox.setBorder(BorderFactory.createLineBorder(Color.BLUE,3));
DropBox.setHorizontalAlignment(SwingConstants.CENTER);
DropBox.setVerticalAlignment(SwingConstants.CENTER);
getContentPane().add(DropBox);
DropBox.setLocation(addTask.getX(),addTask.getY()+addTask.getHeight()+5);
DropBox.setText("<html><font size=\"4\"><b>Drag n Drop Links Here</b></font></html>");
getContentPane().add(cancelb);
cancelb.setSize(273,30);
cancelb.setLocation(status.getX(),DropBox.getY()+DropBox.getHeight()+5);
getContentPane().add(ShowList);
ShowList.setLocation(cancelb.getX(),cancelb.getY()+cancelb.getHeight()+5);
getContentPane().add(jsp);
jsp.setSize(273, 190);
jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
jsp.setLocation(ShowList.getX(),ShowList.getY()+ShowList.getHeight()+5);
jtb.setCellSelectionEnabled(false);
jtb.getColumnModel().getColumn(0).setPreferredWidth(30);
jtb.getColumnModel().getColumn(1).setPreferredWidth(90);
jtb.getColumnModel().getColumn(2).setPreferredWidth(80);
jtb.getColumnModel().getColumn(3).setPreferredWidth(35);
jtb.getColumnModel().getColumn(4).setPreferredWidth(35);
jsp.setViewportBorder(BorderFactory.createLineBorder(Color.yellow));
jsp.getViewport().add(jtb);
ShowList.addActionListener(al);
DropBox.setDropTarget(new DropTarget(addTask,new DropTargetListener() {
@Override
public void dragEnter(DropTargetDragEvent dtde) {}
@Override
public void dropActionChanged(DropTargetDragEvent dtde) {}
@Override
public void dragExit(DropTargetEvent dte) {}
@Override
public void drop(DropTargetDropEvent dtde) {
try {
dtde.acceptDrop(DnDConstants.ACTION_COPY);
String link=(String)dtde.getTransferable().getTransferData(DataFlavor.fragmentHtmlFlavor);
int i=link.indexOf("<a href=\"")+9;
if(i==-1)
{
JOptionPane.showMessageDialog(d,"Invalid link:"+link);
dtde.dropComplete(false);
}
else
{
int j=link.indexOf("\">",i);
link=link.substring(i,j);
droppedLink=link;
addTask.doClick();
dtde.dropComplete(true);
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(d, ex.getMessage());
}
}
@Override
public void dragOver(DropTargetDragEvent dtde) {}
}));
Runner.setPriority(8);
Runner.start();
}
public static void main(String[] args) {
try{
File MutexFile = new File(System.getProperty("java.io.tmpdir") + "\\JavaTongueDManagerRunning");
MutexFile.deleteOnExit();
if (MutexFile.exists()) {
return;
}
try
{
MutexFile.createNewFile();
}
catch (Exception ex) {}
DownloadManager t=new DownloadManager();
t.setVisible(true);
Runtime.getRuntime().addShutdownHook(new Thread()
{
public void run() {
ObjectOutputStream ois=null;
try {
if(t.QueBackup.exists())
t.QueBackup.delete();
t.QueBackup.createNewFile();
ois = new ObjectOutputStream(new FileOutputStream(t.QueBackup));
ois.writeObject((Object)t.Queue);
ois.close();
if (MutexFile.exists())
MutexFile.delete();
Desktop.getDesktop().browse(new URL("http://javatongue.blogspot.com/").toURI());
}catch(Exception ee){JOptionPane.showMessageDialog(t,ee);}
}
}
);
t.addComponentListener(new ComponentAdapter() {
@Override
public void componentHidden(ComponentEvent e) {
System.exit(0);
}
});
}catch(Exception ex)
{
return;
}
}
public void UpdateTable()
{
tableunlocked=false;
tableModel.setRowCount(0);
for(int i=0;i<Queue.size();i++)
{
float flsa=(float)Queue.get(i).size/1000/1000;
float ffff=(float)Queue.get(i).downloaded/1000/1000;
Object[] rowob={i+1,Queue.get(i).address,Queue.get(i).filename,flsa,ffff};
tableModel.addRow(rowob);
}
tableunlocked=true;
}
Thread Runner=new Thread()
{
public void run()
{
while(true)
{
try{Thread.sleep(1000);}catch(Exception ex){JOptionPane.showMessageDialog(d,ex.getMessage());}
if(Queue.size()>0)
{
status.setText("Download starting..");
try {
File f;
int i=0;
URL url=new URL(Queue.get(i).address);
f=new File(Queue.get(i).filename);
HttpURLConnection ucn=(HttpURLConnection)url.openConnection();
ucn.setRequestProperty("Range", "bytes="+Queue.get(i).downloaded+"-");
ucn.connect();
size=ucn.getContentLengthLong();
Queue.get(i).size=size+Queue.get(i).downloaded;
size=Queue.get(i).size;
InputStream is=ucn.getInputStream();
long currsize=Queue.get(i).downloaded;
FileOutputStream fo=new FileOutputStream(f,true);
size=Queue.get(i).size;
tableModel.setValueAt((float)(size/1000/1000),i,3);
byte[] buf=new byte[1000000];
float perc,MBsize;
int len;
MBsize=(float)((float)size/1000/1000);
String MBsizestr=Float.toString(MBsize).substring(0,5);
status.setText("<HTML>Work in progress ("+Integer.toString(Queue.size()-1)+" tasks remaining)."+"<br/>Current: "+Queue.get(i).address+"<br/>ext= "+Queue.get(i).filename+"</HTML>");
while((len=is.read(buf))>0)
{
currsize+=len;
fo.write(buf,0, len);
if(cancel)
break;
if(tableunlocked)
{
if(size!=-1)
{
perc=(float)currsize*100/size;
status.setText("Progress: "+Double.toString(perc).substring(0,5)+"% of "+MBsizestr+" MB.");
}
Queue.get(i).downloaded=currsize;
perc=(float)currsize/1000/1000;
tableModel.setValueAt(perc,i,4);
}
}
fo.close();
tableModel.removeRow(i);
if (cancel)
{
f.delete();
status.setText("<HTML>"+Queue.get(i).address+" cancelled.</HTML>");
cancel=false;
}
else
status.setText("<HTML>"+Queue.get(i).address+" completed.</HTML>");
Queue.remove(i);
for(int m=0;i<Queue.size();i++)
tableModel.setValueAt(m+1,m,0);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
}
}
else
status.setText("<HTML>Queue is Empty. </HTML>");
}
}
};
}
class task implements Serializable{
public String address;
public long size;
public long downloaded;
public String filename;
public task()
{
downloaded=0;
}
}
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