xy.rar_Java 下载器_java 多线程下载

package xy; import java.awt.event.*; import javax.swing.*; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import java.awt.*; import java.util.*; import java.net.*; public class DownloadManager extends JFrame implements Observer{ private JTextField tf; private DownloadTableModel tableModel; private JTable table; private JPanel pl,pl2,pl3; private JButton addButton,pauseButton,resumeButton,cancelButton,clearButton,exitButton; private Download load; private boolean clear; private JMenuBar jb; private JMenu menu,menu1; private JMenuItem item,item1,item2,item3,item4,item5; public DownloadManager(){ this.setTitle("用户下载器"); this.setSize(800,300); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ actionExit(); } }); pl=new JPanel(); jb=new JMenuBar(); menu=new JMenu("文件"); item=new JMenuItem("另存为..."); item.setToolTipText("该菜单项可以使下载的文件保存到自己指定的目录下"); item.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ new Save(); } }); item1=new JMenuItem("退出"); item1.setToolTipText("该界面将退出"); item1.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionExit(); } }); menu.add(item); menu.add(item1); jb.add(menu); pl.add(jb); menu1=new JMenu("编辑"); item2=new JMenuItem("清除"); item2.setToolTipText("该任务将被删除"); item2.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionClear(); } }); item3=new JMenuItem("取消"); item3.setToolTipText("该任务将被取消"); item3.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionCancel(); } }); item4=new JMenuItem("暂停"); item4.setToolTipText("该任务将被暂停"); item4.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionPause(); } }); item5=new JMenuItem("继续"); item5.setToolTipText("该任务将再次继续"); item5.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionResume(); } }); menu1.add(item4); menu1.add(item5); menu1.add(item2); menu1.add(item3); jb.add(menu1); pl.add(jb); tf=new JTextField(30); pl.add(tf); addButton=new JButton("请先添加URL地址，然后开始下载"); addButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionAdd(); } }); pl.add(addButton); tableModel=new DownloadTableModel(); table=new JTable(tableModel); table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){ public void valueChanged(ListSelectionEvent e){ tablechanged(); } }); table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); ProgressRenderer renderer=new ProgressRenderer(0,100); renderer.setStringPainted(true); table.setDefaultRenderer(JProgressBar.class,renderer); table.setRowHeight((int)renderer.getPreferredSize().getHeight()); pl2=new JPanel(); pl2.setBorder(BorderFactory.createTitledBorder("任务如下:")); pl2.setLayout(new BorderLayout()); pl2.add(new JScrollPane(table),BorderLayout.CENTER); pl3=new JPanel(); pauseButton=new JButton("暂停(P)"); pauseButton.setMnemonic('P'); pauseButton.setToolTipText("任务将暂停..."); pauseButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionPause(); } } ); pauseButton.setEnabled(false); pl3.add(pauseButton); resumeButton=new JButton("继续(R)"); resumeButton.setMnemonic('R'); resumeButton.setToolTipText("任务将继续..."); resumeButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionResume(); } } ); resumeButton.setEnabled(false); pl3.add(resumeButton); cancelButton=new JButton("取消(C)"); cancelButton.setMnemonic('C'); cancelButton.setToolTipText("任务将取消..."); cancelButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionCancel(); } } ); cancelButton.setEnabled(false); pl3.add(cancelButton); clearButton=new JButton("清除(Z)"); clearButton.setMnemonic('Z'); clearButton.setToolTipText("任务将清除..."); clearButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ actionClear(); } } ); clearButton.setEnabled(false); pl3.add(clearButton); exitButton=new JButton("退出(E)"); exitButton.setMnemonic('E'); exitButton.setToolTipText("将退出下载界面..."); exitButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ actionExit(); } } ); exitButton.setEnabled(true); pl3.add(exitButton); this.getContentPane().setLayout(new BorderLayout()); this.getContentPane().add(pl,BorderLayout.NORTH); this.getContentPane().add(pl2,BorderLayout.CENTER); this.getContentPane().add(pl3,BorderLayout.SOUTH); } public static void actionExit(){ System.exit(0); } private void actionAdd(){ URL url=showurl(tf.getText()); if(url!=null){ tableModel.addDownload(new Download(url)); tf.setText(""); } else{ JOptionPane.showMessageDialog(this,"Invalid Download URL","Error",JOptionPane.ERROR_MESSAGE); } } private URL showurl(String url) { if (!url.toLowerCase().startsWith("http://")){ return null; } URL showurl=null; try{ showurl=new URL(url); } catch (Exception e){ return null; } if (showurl.getFile().length()<2){ return null; } return showurl; } private void tablechanged(){ if (load!=null){ load.deleteObserver(DownloadManager.this); } if (!clear){