Untitled

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
 */

package bai01;

/**
 *
 * @author hotua
 */
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicLong;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;



public class Bai01 {
    /**
     * @param args the command line arguments
     */
  
    private static DownloadTask downloadTask;
    public static void main(String[] args) {
        
        
        JFrame window=new JFrame ("NOTPAD WITH TAG");
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setSize(800,600);
        
        JTabbedPane tabbedPane=new JTabbedPane();
        tabbedPane.setFocusable(false);
        //Add button 
        JButton addButton= new JButton("+");
        addButton.setBorder(null);
        addButton.setFocusPainted(false);
        addButton.setContentAreaFilled(false);
        addButton.setPreferredSize(new Dimension(30,30));
        //Counter
        AtomicLong counter = new AtomicLong(0);
        //JLabel valueLabel = new JLabel("Value: 0");
        
        addButton.addActionListener(new ActionListener(){
            
            @Override
            public void actionPerformed(ActionEvent e) {
                JPanel formPanel = createFormPanel();
                long nextValue = counter.incrementAndGet();
                JTextArea textArea=new JTextArea();
                JLabel tabTitleLabel=new JLabel("TAB"+nextValue);
                tabTitleLabel.setPreferredSize(new Dimension(20, 10));
                tabbedPane.addTab("TAB"+nextValue,textArea);
                tabbedPane.setComponentAt(tabbedPane.getTabCount()-1, formPanel);
                
            }
        });
        
        tabbedPane.addTab("", null);
        tabbedPane.setTabComponentAt(0, addButton);
        
        window.add(tabbedPane);
        window.setVisible(true);
        
    }

  private static JPanel createFormPanel() {
        JPanel panel = new JPanel();
        //panel.setLayout(new GridLayout(3, 2));

        JLabel linkLabel = new JLabel("Link:");
        JTextField linkField = new JTextField(70);
        linkField.setColumns(75);
        JLabel saveLabel = new JLabel("Save to:");
        JTextField saveField = new JTextField(70);
        saveField.setColumns(75);
        JLabel progressLabel = new JLabel("Progress:");
        
        JProgressBar progressBar = new JProgressBar();
        progressBar.setMinimum(0);
        progressBar.setMaximum(100);
        progressBar.setPreferredSize(new Dimension(753, 20));
        progressBar.setStringPainted(true);

        
        JButton startButton = new JButton("Start");
        JButton stopButton = new JButton("Stop");
        stopButton.setEnabled(false);
        //Event download
        startButton.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
               String link=linkField.getText();
               String save=saveField.getText();
               startButton.setEnabled(false);
               stopButton.setEnabled(true);
               ExecutorService executor = Executors.newSingleThreadExecutor();
               executor.execute(new DownloadTask(link, save, progressBar));
               executor.shutdown();
            }
        });
        
        stopButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                ExecutorService executor = Executors.newSingleThreadExecutor();
                if(downloadTask != null) {
                    // Stop the download task and shut down the executor
                    downloadTask.cancel(true);
                    executor.shutdownNow();
                }

                // Enable start button and disable stop button
                startButton.setEnabled(true);
                stopButton.setEnabled(false);
            }
        });
        panel.add(linkLabel);
        panel.add(linkField);
        panel.add(saveLabel);
        panel.add(saveField);
        panel.add(progressLabel);
        panel.add(progressBar);
        panel.add(startButton);
        panel.add(stopButton);
        return panel;
    }
}

//Download Task class
/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package bai01;

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Paths;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;

/**
 *
 * @author hotua
 */
public class DownloadTask implements Runnable {

        private String link;
        private String save;
        private JProgressBar progressBar;
        public DownloadTask(String link, String save,JProgressBar progressBar) {
            this.link = link;
            this.save = save;
            this.progressBar=progressBar;
        }

        @Override
        public void run() {
            try {
                URL url = new URL(link);
                try (BufferedInputStream in = new BufferedInputStream(url.openStream());
                     FileOutputStream fileOutputStream = new FileOutputStream(Paths.get(save).getFileName().toString())) {

                    int bytesRead;
                    byte[] buffer = new byte[1024];
                    long totalBytesRead = 0;
                    long fileSize = url.openConnection().getContentLengthLong();

                    while ((bytesRead = in.read(buffer, 0, 1024)) != -1) {
                        fileOutputStream.write(buffer, 0, bytesRead);
                        totalBytesRead += bytesRead;

                        int progress = (int) ((totalBytesRead * 100) / fileSize);
                        SwingUtilities.invokeLater(() -> progressBar.setValue(progress));
                    }

                    SwingUtilities.invokeLater(() -> progressBar.setValue(100));
                    JOptionPane.showMessageDialog(null, "Download complete!");
                } catch (IOException e) {
                    SwingUtilities.invokeLater(() -> {
                        JOptionPane.showMessageDialog(null, "Error downloading file: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
                    });
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
}