downloadmanager.java

一个网络上传下载器

        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addDownloadButtonActionPerformed(evt);
            }
        });
        editMenuItem1.add(jMenuItem1);

        jMenuBar2.add(editMenuItem1);

        controlMenuItem.setText("Control");
        controlMenuItem.setName("controlMenuItem"); // NOI18N

        startMenuItem.setText("Start");
        startMenuItem.setName("startMenuItem"); // NOI18N
        startMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                startMenuItemActionPerformed(evt);
            }
        });
        controlMenuItem.add(startMenuItem);

        pauseMenuItem.setText("Pause");
        pauseMenuItem.setName("pauseMenuItem"); // NOI18N
        pauseMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                pauseButtonActionPerformed(evt);
            }
        });
        controlMenuItem.add(pauseMenuItem);

        resumeMenuItem.setText("Resume");
        resumeMenuItem.setName("resumeMenuItem"); // NOI18N
        resumeMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                resumeButtonActionPerformed(evt);
            }
        });
        controlMenuItem.add(resumeMenuItem);

        stopMenuItem.setText("Stop");
        stopMenuItem.setName("stopMenuItem"); // NOI18N
        stopMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cancelButtonActionPerformed(evt);
            }
        });
        controlMenuItem.add(stopMenuItem);

        jMenuBar2.add(controlMenuItem);

        helpMenuItem.setText("Help");
        helpMenuItem.setName("helpMenuItem"); // NOI18N

        aboutMenuItem.setText("About");
        aboutMenuItem.setName("aboutMenuItem"); // NOI18N
        helpMenuItem.add(aboutMenuItem);

        jMenuBar2.add(helpMenuItem);

        setJMenuBar(jMenuBar2);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(60, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-800)/2, (screenSize.height-640)/2, 800, 640);
    }// </editor-fold>//GEN-END:initComponents
    /** This method is called when system initiate.
     ** It is used to initiate settings of Downloads table.
     */
    private void setDownloadsTableModel() {
        //Setup download table
        jTable1.getSelectionModel().addListSelectionListener(new ListSelectionListener() {

            public void valueChanged(ListSelectionEvent e) {
                tableSelectionChanged();
            }
        });
        // Allow only one row at a time to be selected.
        jTable1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        // Set up ProgressBar as renderer for progress column.
        ProgressRenderer renderer = new ProgressRenderer(0, 100);
        renderer.setStringPainted(true); // show progress text
        jTable1.setDefaultRenderer(JProgressBar.class, renderer);

        // Set table's row height large enough to fit JProgressBar.
        jTable1.setRowHeight((int) renderer.getPreferredSize().getHeight());
    }

    private void addDownloadButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addDownloadButtonActionPerformed

        String urlString = txtURL.getText();
        String rename = txtRenameAs.getText().trim().toString();
        actionAdd(urlString, Integer.parseInt(threadsSpinner.getValue().toString()),
                this.txtSaveTo.getText() + "\\", rename);

        //follows are temped set
        pauseButton.setEnabled(false);
        resumeButton.setEnabled(false);
        cancelButton.setEnabled(false);
        this.removeDownloadButton.setEnabled(false);
        this.startButton.setEnabled(false);
    // end temped set.
                        
}//GEN-LAST:event_addDownloadButtonActionPerformed

    private void fileExitMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fileExitMenuItem1ActionPerformed
        System.exit(0);
    }//GEN-LAST:event_fileExitMenuItem1ActionPerformed

    private void browseButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_browseButtonActionPerformed
        // TODO add your handling code here:
        FolderSelected folderSelected = new FolderSelected(DownloadManager.this);
        txtSaveTo.setText(folderSelected.getFolderPath());
    }//GEN-LAST:event_browseButtonActionPerformed

    private void removeDownloadButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_removeDownloadButtonActionPerformed
        // TODO add your handling code here:
        clearing = true;
        tableModel.clearDownload(table.getSelectedRow());
        clearing = false;
        selectedDownload = null;
        updateButtons();
    }//GEN-LAST:event_removeDownloadButtonActionPerformed

    private void pauseButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_pauseButtonActionPerformed
        // TODO add your handling code here:
        selectedDownload.pause();
        updateButtons();
    }//GEN-LAST:event_pauseButtonActionPerformed

    private void resumeButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_resumeButtonActionPerformed
        // TODO add your handling code here:
        selectedDownload.resume();
        updateButtons();
    }//GEN-LAST:event_resumeButtonActionPerformed

    private void cancelButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cancelButtonActionPerformed
        // TODO add your handling code here:
        selectedDownload.cancel();
        updateButtons();
    }//GEN-LAST:event_cancelButtonActionPerformed

    private void startMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_startMenuItemActionPerformed
    // TODO add your handling code here:
    }//GEN-LAST:event_startMenuItemActionPerformed

    private void menuItemCodeManagerActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_menuItemCodeManagerActionPerformed
        // TODO add your handling code here:
        new CodeManager().setVisible(true);
        this.dispose();
}//GEN-LAST:event_menuItemCodeManagerActionPerformed

    private void startButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_startButtonActionPerformed
    // TODO add your handling code here:
    }//GEN-LAST:event_startButtonActionPerformed

    /**
    this method is called when adding a new download.
    @param urlString   full URL path
    @param threadNumber    number of threads set to one download job
    @param localFileAddress    local path which is saved
    @param filename    downloading file name
     */
    private void actionAdd(String urlString, int threadNumber, String localFileAddress, String filename) {
        try {
            URL verifyUrl = new URL(urlString);
            if (verifyUrl != null) {
                tableModel.addDownload(new Download(verifyUrl, threadNumber, localFileAddress, filename));
            } else {
                JOptionPane.showMessageDialog(this,
                        "Invalid Download URL", "Error",
                        JOptionPane.ERROR_MESSAGE);
            }
        } catch (MalformedURLException malURLe) {
            System.err.println(malURLe);
        }
    }

    /**
    this method is 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 (!removing) {
            selectedDownload =
                    tableModel.getDownload(table.getSelectedRow());
            selectedDownload.addObserver(DownloadManager.this);
            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.
    @param o observed object which implement the Observalbe
    @param arg
     */
    public void update(Observable o, Object arg) {
        //Update buttons if the selected download has changed.
        if (selectedDownload != null && selectedDownload.equals(o)) {
            updateButtons();
        }
    }

    /**
    @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new DownloadManager().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JMenuItem aboutMenuItem;
    private javax.swing.JButton addDownloadButton;
    private javax.swing.JButton browseButton;
    private javax.swing.JButton cancelButton;
    private javax.swing.JPanel controlButtonPanel;
    private javax.swing.JMenu controlMenuItem;
    private javax.swing.JPanel downloadsPanel;
    private javax.swing.JMenu editMenuItem1;
    private javax.swing.JMenuItem fileExitMenuItem1;
    private javax.swing.JMenu fileMenuItem1;
    private javax.swing.JMenu helpMenuItem;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JMenuBar jMenuBar2;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JSeparator jSeparator2;
    private javax.swing.JTable jTable1;
    private javax.swing.JMenuItem menuItemCodeManager;
    private javax.swing.JButton pauseButton;
    private javax.swing.JMenuItem pauseMenuItem;
    private javax.swing.JButton removeDownloadButton;
    private javax.swing.JButton resumeButton;
    private javax.swing.JMenuItem resumeMenuItem;
    private javax.swing.JButton showDetailsButton;
    private javax.swing.JButton startButton;
    private javax.swing.JMenuItem startMenuItem;
    private javax.swing.JMenuItem stopMenuItem;
    private javax.swing.JSpinner threadsSpinner;
    private javax.swing.JTextField txtRenameAs;
    private javax.swing.JTextField txtSaveTo;
    public javax.swing.JTextField txtURL;
    // End of variables declaration//GEN-END:variables

    // Variables Declaration
    private DownloadsTableModel tableModel; // Download table's data model.  
    private JTable table;   // Table listing downloads.
    private Download selectedDownload;  // Currently selected download.
    private boolean removing;   // Flag for whether or not table 
    // Flag for whether or not table selection is being cleared.
    private boolean clearing;    //selection is being cleared.
    // End of variables declaration
    }