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--Make your Own Internet download manager-- Empty
PostSubject: --Make your Own Internet download manager--   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:00 pm

Today I gonna tell you that how to make your own Internet ownload manager using java

Just Copy the code after download java

--Make your Own Internet download manager-- 1



  • Download.java: Contains Download class which downloads a file from a URL.
  • DownloadManager.java: Contains the main class for download manager application.
  • DownloadsTableModel.java: Contains the class which manages the download table's data.
  • ProgressRenderer.java: Contains the class which is responsible to render a JProgressBar in a table cell.


The contents of the listed files are written below.

Download.java


Code:
import java.io.*;
import java.net.*;
import java.util.*;

// This class downloads a file from a URL.
class Download extends Observable implements Runnable {
   
    // Max size of download buffer.
    private static final int MAX_BUFFER_SIZE = 1024;
   
    // These are the status names.
    public static final String STATUSES[] = {"Downloading",
    "Paused", "Complete", "Cancelled", "Error"};
   
    // These are the status codes.
    public static final int DOWNLOADING = 0;
    public static final int PAUSED = 1;
    public static final int COMPLETE = 2;
    public static final int CANCELLED = 3;
    public static final int ERROR = 4;
   
    private URL url; // download URL
    private int size; // size of download in bytes
    private int downloaded; // number of bytes downloaded
    private int status; // current status of download
   
    // Constructor for Download.
    public Download(URL url) {
        this.url = url;
        size = -1;
        downloaded = 0;
        status = DOWNLOADING;
       
        // Begin the download.
        download();
    }
   
    // Get this download's URL.
    public String getUrl() {
        return url.toString();
    }
   
    // Get this download's size.
    public int getSize() {
        return size;
    }
   
    // Get this download's progress.
    public float getProgress() {
        return ((float) downloaded / size) * 100;
    }
   
    // Get this download's status.
    public int getStatus() {
        return status;
    }
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--Make your Own Internet download manager-- Empty
PostSubject: Page 2   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:02 pm

Code:
  // Pause this download.
    public void pause() {
        status = PAUSED;
        stateChanged();
    }
   
    // Resume this download.
    public void resume() {
        status = DOWNLOADING;
        stateChanged();
        download();
    }
   
    // Cancel this download.
    public void cancel() {
        status = CANCELLED;
        stateChanged();
    }
   
    // Mark this download as having an error.
    private void error() {
        status = ERROR;
        stateChanged();
    }
   
    // Start or resume downloading.
    private void download() {
        Thread thread = new Thread(this);
        thread.start();
    }
   
    // Get file name portion of URL.
    private String getFileName(URL url) {
        String fileName = url.getFile();
        return fileName.substring(fileName.lastIndexOf('/') + 1);
    }
   
    // Download file.
    public void run() {
        RandomAccessFile file = null;
        InputStream stream = null;
       
        try {
            // Open connection to URL.
            HttpURLConnection connection =
                    (HttpURLConnection) url.openConnection();
           
            // Specify what portion of file to download.
            connection.setRequestProperty("Range",
                    "bytes=" + downloaded + "-");
           
            // Connect to server.
            connection.connect();
           
            // Make sure response code is in the 200 range.
            if (connection.getResponseCode() / 100 != 2) {
                error();
            }
           
            // Check for valid content length.
            int contentLength = connection.getContentLength();
            if (contentLength < 1) {
                error();
            }
           
      /* Set the size for this download if it
        hasn't been already set. */
            if (size == -1) {
                size = contentLength;
                stateChanged();
            }
           
            // Open file and seek to the end of it.
            file = new RandomAccessFile(getFileName(url), "rw");
            file.seek(downloaded);
           
            stream = connection.getInputStream();
            while (status == DOWNLOADING) {
        /* Size buffer according to how much of the
          file is left to download. */
                byte buffer[];
                if (size - downloaded > MAX_BUFFER_SIZE) {
                    buffer = new byte[MAX_BUFFER_SIZE];
                } else {
                    buffer = new byte[size - downloaded];
                }
               
                // Read from server into buffer.
                int read = stream.read(buffer);
                if (read == -1)
                    break;
               
                // Write buffer to file.
                file.write(buffer, 0, read);
                downloaded += read;
                stateChanged();
            }
           
      /* Change status to complete if this point was
        reached because downloading has finished. */
            if (status == DOWNLOADING) {
                status = COMPLETE;
                stateChanged();
            }
        } catch (Exception e) {
            error();
        } finally {
            // Close file.
            if (file != null) {
                try {
                    file.close();
                } catch (Exception e) {}
            }
           
            // Close connection to server.
            if (stream != null) {
                try {
                    stream.close();
                } catch (Exception e) {}
            }
        }
    }
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--Make your Own Internet download manager-- Empty
PostSubject: Page 3   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:04 pm

Code:
  // Notify observers that this download's status has changed.
    private void stateChanged() {
        setChanged();
        notifyObservers();
    }
}

DownloadManager.java
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;

// The Download Manager.
public class DownloadManager extends JFrame
        implements Observer {
   
    // Add download text field.
    private JTextField addTextField;
   
    // Download table's data model.
    private DownloadsTableModel tableModel;
   
    // Table listing downloads.
    private JTable table;
   
    // These are the buttons for managing the selected download.
    private JButton pauseButton, resumeButton;
    private JButton cancelButton, clearButton;
   
    // Currently selected download.
    private Download selectedDownload;
   
    // Flag for whether or not table selection is being cleared.
    private boolean clearing;
   
    // Constructor for Download Manager.
    public DownloadManager() {
        // Set application title.
        setTitle("Download Manager");
       
        // Set window size.
        setSize(640, 480);
       
        // Handle window closing events.
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                actionExit();
            }
        });
       
        // Set up file menu.
        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("File");
        fileMenu.setMnemonic(KeyEvent.VK_F);
        JMenuItem fileExitMenuItem = new JMenuItem("Exit",
                KeyEvent.VK_X);
        fileExitMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionExit();
            }
        });
        fileMenu.add(fileExitMenuItem);
        menuBar.add(fileMenu);
        setJMenuBar(menuBar);
       
        // Set up add panel.
        JPanel addPanel = new JPanel();
        addTextField = new JTextField(30);
        addPanel.add(addTextField);
        JButton addButton = new JButton("Add Download");
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionAdd();
            }
        });
        addPanel.add(addButton);
       
        // Set up Downloads table.
        tableModel = new DownloadsTableModel();
        table = new JTable(tableModel);
        table.getSelectionModel().addListSelectionListener(new
                ListSelectionListener() {
            public void valueChanged(ListSelectionEvent e) {
                tableSelectionChanged();
            }
        });
        // Allow only one row at a time to be selected.
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
       
        // Set up ProgressBar as renderer for progress column.
        ProgressRenderer renderer = new ProgressRenderer(0, 100);
        renderer.setStringPainted(true); // show progress text
        table.setDefaultRenderer(JProgressBar.class, renderer);
       
        // Set table's row height large enough to fit JProgressBar.
        table.setRowHeight(
                (int) renderer.getPreferredSize().getHeight());
       
        // Set up downloads panel.
        JPanel downloadsPanel = new JPanel();
        downloadsPanel.setBorder(
                BorderFactory.createTitledBorder("Downloads"));
        downloadsPanel.setLayout(new BorderLayout());
        downloadsPanel.add(new JScrollPane(table),
                BorderLayout.CENTER);
       
        // Set up buttons panel.
        JPanel buttonsPanel = new JPanel();
        pauseButton = new JButton("Pause");
        pauseButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionPause();
            }
        });
        pauseButton.setEnabled(false);
        buttonsPanel.add(pauseButton);
        resumeButton = new JButton("Resume");
        resumeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionResume();
            }
        });
        resumeButton.setEnabled(false);
        buttonsPanel.add(resumeButton);
        cancelButton = new JButton("Cancel");
        cancelButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionCancel();
            }
        });
        cancelButton.setEnabled(false);
        buttonsPanel.add(cancelButton);
        clearButton = new JButton("Clear");
        clearButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionClear();
            }
        });
        clearButton.setEnabled(false);
        buttonsPanel.add(clearButton);
       
        // Add panels to display.
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(addPanel, BorderLayout.NORTH);
        getContentPane().add(downloadsPanel, BorderLayout.CENTER);
        getContentPane().add(buttonsPanel, BorderLayout.SOUTH);
    }
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--Make your Own Internet download manager-- Empty
PostSubject: page 4   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:10 pm

Code:
 // Exit this program.
    private void actionExit() {
        System.exit(0);
    }
   
    // Add a new download.
    private void actionAdd() {
        URL verifiedUrl = verifyUrl(addTextField.getText());
        if (verifiedUrl != null) {
            tableModel.addDownload(new Download(verifiedUrl));
            addTextField.setText(""); // reset add text field
        } else {
            JOptionPane.showMessageDialog(this,
                    "Invalid Download URL", "Error",
                    JOptionPane.ERROR_MESSAGE);
        }
    }
   
    // Verify download URL.
    private URL verifyUrl(String url) {
        // Only allow HTTP URLs.
        if (!url.toLowerCase().startsWith("http://"))
            return null;
       
        // Verify format of URL.
        URL verifiedUrl = null;
        try {
            verifiedUrl = new URL(url);
        } catch (Exception e) {
            return null;
        }
       
        // Make sure URL specifies a file.
        if (verifiedUrl.getFile().length() < 2)
            return null;
       
        return verifiedUrl;
    }
   
    // Called when table row selection changes.
    private void tableSelectionChanged() {
    /* Unregister from receiving notifications
      from the last selected download. */
        if (selectedDownload != null)
            selectedDownload.deleteObserver(DownloadManager.this);
       
    /* If not in the middle of clearing a download,
      set the selected download and register to
      receive notifications from it. */
        if (!clearing) {
            selectedDownload =
                    tableModel.getDownload(table.getSelectedRow());
            selectedDownload.addObserver(DownloadManager.this);
            updateButtons();
        }
    }
   
    // Pause the selected download.
    private void actionPause() {
        selectedDownload.pause();
        updateButtons();
    }
   
    // Resume the selected download.
    private void actionResume() {
        selectedDownload.resume();
        updateButtons();
    }
   
    // Cancel the selected download.
    private void actionCancel() {
        selectedDownload.cancel();
        updateButtons();
    }
   
    // Clear the selected download.
    private void actionClear() {
        clearing = true;
        tableModel.clearDownload(table.getSelectedRow());
        clearing = false;
        selectedDownload = null;
        updateButtons();
    }
   
  /* Update each button's state based off of the
    currently selected download's status. */
    private void updateButtons() {
        if (selectedDownload != null) {
            int status = selectedDownload.getStatus();
            switch (status) {
                case Download.DOWNLOADING:
                    pauseButton.setEnabled(true);
                    resumeButton.setEnabled(false);
                    cancelButton.setEnabled(true);
                    clearButton.setEnabled(false);
                    break;
                case Download.PAUSED:
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(true);
                    cancelButton.setEnabled(true);
                    clearButton.setEnabled(false);
                    break;
                case Download.ERROR:
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(true);
                    cancelButton.setEnabled(false);
                    clearButton.setEnabled(true);
                    break;
                default: // COMPLETE or CANCELLED
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(false);
                    cancelButton.setEnabled(false);
                    clearButton.setEnabled(true);
            }
        } else {
            // No download is selected in table.
            pauseButton.setEnabled(false);
            resumeButton.setEnabled(false);
            cancelButton.setEnabled(false);
            clearButton.setEnabled(false);
        }
    }
   
  /* Update is called when a Download notifies its
    observers of any changes. */
    public void update(Observable o, Object arg) {
        // Update buttons if the selected download has changed.
        if (selectedDownload != null && selectedDownload.equals(o))
            updateButtons();
    }
   
    // Run the Download Manager.
    public static void main(String[] args) {
        DownloadManager manager = new DownloadManager();
        manager.show();
    }
}
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--Make your Own Internet download manager-- Empty
PostSubject: page 5   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:13 pm

Code:
DownloadTableModel.java
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

// This class manages the download table's data.
class DownloadsTableModel extends AbstractTableModel
        implements Observer {
   
    // These are the names for the table's columns.
    private static final String[] columnNames = {"URL", "Size",
    "Progress", "Status"};
   
    // These are the classes for each column's values.
    private static final Class[] columnClasses = {String.class,
    String.class, JProgressBar.class, String.class};
   
    // The table's list of downloads.
    private ArrayList downloadList = new ArrayList();
   
    // Add a new download to the table.
    public void addDownload(Download download) {
       
        // Register to be notified when the download changes.
        download.addObserver(this);
       
        downloadList.add(download);
       
        // Fire table row insertion notification to table.
        fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1);
    }
   
    // Get a download for the specified row.
    public Download getDownload(int row) {
        return (Download) downloadList.get(row);
    }
   
    // Remove a download from the list.
    public void clearDownload(int row) {
        downloadList.remove(row);
       
        // Fire table row deletion notification to table.
        fireTableRowsDeleted(row, row);
    }
   
    // Get table's column count.
    public int getColumnCount() {
        return columnNames.length;
    }
   
    // Get a column's name.
    public String getColumnName(int col) {
        return columnNames[col];
    }
   
    // Get a column's class.
    public Class getColumnClass(int col) {
        return columnClasses[col];
    }
   
    // Get table's row count.
    public int getRowCount() {
        return downloadList.size();
    }
   
    // Get value for a specific row and column combination.
    public Object getValueAt(int row, int col) {
       
        Download download = (Download) downloadList.get(row);
        switch (col) {
            case 0: // URL
                return download.getUrl();
            case 1: // Size
                int size = download.getSize();
                return (size == -1) ? "" : Integer.toString(size);
            case 2: // Progress
                return new Float(download.getProgress());
            case 3: // Status
                return Download.STATUSES[download.getStatus()];
        }
        return "";
    }
   
  /* Update is called when a Download notifies its
    observers of any changes */
    public void update(Observable o, Object arg) {
        int index = downloadList.indexOf(o);
       
        // Fire table row update notification to table.
        fireTableRowsUpdated(index, index);
    }
}

ProgressRenderer.java
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

// This class renders a JProgressBar in a table cell.
class ProgressRenderer extends JProgressBar
        implements TableCellRenderer {
   
    // Constructor for ProgressRenderer.
    public ProgressRenderer(int min, int max) {
        super(min, max);
    }
   
  /* Returns this JProgressBar as the renderer
    for the given table cell. */
    public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected,
            boolean hasFocus, int row, int column) {
        // Set JProgressBar's percent complete value.
        setValue((int) ((Float) value).floatValue());
        return this;
    }
}
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Hacker iam
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--Make your Own Internet download manager-- Empty
PostSubject: Download Code   --Make your Own Internet download manager-- I_icon_minitime09/02/11, 06:23 pm

If u hate that code u can download the JAVA.txt from this attachment
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orin222

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PostSubject: Re: --Make your Own Internet download manager--   --Make your Own Internet download manager-- I_icon_minitime16/02/12, 12:56 pm

what next?
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orin222

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PostSubject: Re: --Make your Own Internet download manager--   --Make your Own Internet download manager-- I_icon_minitime16/02/12, 12:57 pm

i have installed java and downloaded the code.... then?
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PostSubject: Re: --Make your Own Internet download manager--   --Make your Own Internet download manager-- I_icon_minitime

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