Java编写的多线程下载器源代码

package ui; import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JProgressBar; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.SwingConstants; import javax.swing.UIManager; import thread.DownloadThread; import util.Calculator; import util.DownloadUtil; public class DownloaderClient extends JFrame{ private static final long serialVersionUID = 1L; public static long startTime; private JTextArea infoArea; private JProgressBar progressBar; private JTextField pathField; private JButton startButton; private JButton cancelButton; private JTextField fileField; private JButton chooseButton; private JFileChooser fileChooser; private JComboBox threadNumComboBox; public DownloaderClient() throws Exception{ UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); this.setTitle("多线程下载"); this.setSize(600,350); this.setResizable(false); Container contentPanel = this.getContentPane(); contentPanel.setLayout(new BorderLayout()); ButtonListener btnListener = new ButtonListener(); infoArea = new JTextArea(); infoArea.setLineWrap(true); infoArea.setEditable(false); JScrollPane scroll = new JScrollPane(infoArea); //分别设置水平和垂直滚动条自动出现 scroll.setHorizontalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); scroll.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); progressBar = new JProgressBar(SwingConstants.HORIZONTAL, 0, 100); //progressBar.setStringPainted(true); JPanel centerPanel = new JPanel(new BorderLayout(5,2)); centerPanel.add(progressBar, BorderLayout.NORTH); centerPanel.add(scroll,BorderLayout.CENTER); JLabel pathLabel = new JLabel("下载路径："); pathField = new JTextField(86); JPanel pathPanel = new JPanel(new FlowLayout(FlowLayout.LEFT,1,0)); pathPanel.add(pathLabel); pathPanel.add(pathField); startButton = new JButton("下载"); cancelButton = new JButton("取消"); startButton.addActionListener(btnListener); cancelButton.addActionListener(btnListener); JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); buttonPanel.add(startButton); buttonPanel.add(cancelButton); JLabel fileLabel = new JLabel("保存路径："); String currentDir = System.getProperty("user.dir"); fileField = new JTextField(currentDir+File.separator,54); chooseButton = new JButton("浏览"); chooseButton.addActionListener(btnListener); JLabel threadNumLabel = new JLabel(" 启用线程数："); Object num[] = {1,2,3,4,5,6,7,8,9,10}; threadNumComboBox = new JComboBox(num); threadNumComboBox.setSelectedItem(5); JPanel filePanel = new JPanel(new FlowLayout(FlowLayout.LEFT,1,0)); filePanel.add(fileLabel); filePanel.add(fileField); filePanel.add(chooseButton); filePanel.add(threadNumLabel); filePanel.add(threadNumComboBox); JPanel northPanel = new JPanel(new GridLayout(3,1,0,0)); northPanel.add(pathPanel); northPanel.add(filePanel); northPanel.add(buttonPanel); contentPanel.add(northPanel,BorderLayout.NORTH); contentPanel.add(centerPanel,BorderLayout.CENTER); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setLocationRelativeTo(null); this.setVisible(true); } private class CalculateThread extends Thread { @Override public void run() { int flg = 0; while (true) { try { Calculator.calculate(); infoArea.setText(Calculator.getMessage()); progressBar.setValue(Calculator.getProgress()); Thread.sleep(1000); } catch (Exception e) { infoArea.setText(""); infoArea.append("\n\n"); infoArea.append("错误信息：\n"); infoArea.append("--------------------------------\n"); infoArea.append(e.toString()); } //为了让最后的画面停留在100%的时刻，让循环多进行一次，否则会停留在完成99%的画面上 if (DownloadUtil.isDownloadFinished()){ flg++; if(flg == 2){ if(!DownloadThread.isCanceled) infoArea.append("下载完成！"); else infoArea.append("下载已取消！"); startButton.setEnabled(true); break; } } } } } private class ButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent e) { if(e.getSource()==startButton){ DownloadThread.isCanceled = false; String path= pathField.getText().trim(); String saveDir = fileField.getText().trim(); try { int threadNum = (Integer) threadNumComboBox.getSelectedItem(); DownloadUtil.download(path,saveDir,threadNum); startTime = System.currentTimeMillis(); CalculateThread ct = new CalculateThread(); ct.start(); startButton.setEnabled(false); } catch (Exception e1) { infoArea.setText(""); infoArea.append("\n\n"); infoArea.append("错误信息：\n"); infoArea.append("--------------------------------\n"); infoArea.append(e1.toString()); } }else if(e.getSource()==chooseButton){ fileChooser = new JFileChooser("."); fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); fileChooser.setDialogTitle("选择文件夹"); int ret = fileChooser.showOpenDialog(DownloaderClient.this); if (ret == JFileChooser.APPROVE_OPTION) { //文件夹路径 fileField.setText(fileChooser.getSelectedFile().getAbsolutePath()+File.separator); } }else if(e.getSource()==cancelButton){ DownloadThread.isCanceled = true; } } } /** * http://download.5211game.com/11/download/5211install_1181.exe * http://dldir1.qq.com/qqfile/qq/QQ2013/2013Beta5/6966/QQ2013Beta5.exe * http://dldir1.qq.com/music/clntupate/QQMusic_Setup_90_900.exe * @param args * @throws Exception */ public static void main(String[] args) throws Exception { new DownloaderClient(); } }