【Java】文件管理器

import java.awt.*;import java.awt.event.*;import java.io.*;import java.util.*;import javax.swing.*;import javax.swing.tree.*;import javax.swing.event.*;public class FileTree extends JFrame implements ActionListener{public static final ImageIcon ICON_COMPUTER = new ImageIcon("computer.jpg");public static final ImageIcon ICON_DISK = new ImageIcon("disk.gif");public static final ImageIcon ICON_FOLDER =new ImageIcon("folder.gif");public static final ImageIcon ICON_EXPANDEDFOLDER = new ImageIcon("folder.gif");    public static final ImageIcon ICON_File = new ImageIcon("file.gif");protected JTree  m_tree;protected DefaultTreeModel m_model;protected JTextField m_display;protected JTextArea m_area;public FileTree(){super("文件管理器"); setSize(800, 600);        JMenuBar mBar = new JMenuBar();JMenu Menu1 = new JMenu("文件");JMenu Menu2 = new JMenu("编辑");JMenu Menu3 = new JMenu("查看");JMenu Menu4 = new JMenu("收藏");JMenu Menu5 = new JMenu("工具");JMenu Menu6 = new JMenu("帮助");        mBar.add(Menu1);        mBar.add(Menu2);        mBar.add(Menu3);        mBar.add(Menu4);        mBar.add(Menu5);        mBar.add(Menu6);        JMenuItem m11=new JMenuItem("打开");        JMenuItem m12=new JMenuItem("保存");        JMenuItem m13=new JMenuItem("另存为");        JMenuItem m14=new JMenuItem("新建");        JMenuItem m15=new JMenuItem("退出");                       JMenuItem m21=new JMenuItem("编辑");          JMenuItem m22=new JMenuItem("复制");          JMenuItem m23=new JMenuItem("粘贴");          JMenuItem m24=new JMenuItem("删除");        JMenuItem m31=new JMenuItem("地址栏");        JMenuItem m32=new JMenuItem("方式");        JMenuItem m33=new JMenuItem("刷新");        JMenuItem m41=new JMenuItem("添加到收藏夹");        JMenuItem m51=new JMenuItem("文件夹选项");        JMenuItem m61=new JMenuItem("关于主题");        JMenuItem m62=new JMenuItem("作者信息");        m11.addActionListener(this);        m12.addActionListener(this);        m13.addActionListener(this);        m14.addActionListener(this);        m15.addActionListener(this);        m21.addActionListener(this);        m22.addActionListener(this);m23.addActionListener(this);m24.addActionListener(this);m31.addActionListener(this);m32.addActionListener(this);m33.addActionListener(this);Menu1.add(m11);Menu1.add(m12);Menu1.add(m13);Menu1.add(m14);Menu1.add(m15);Menu2.add(m21);Menu2.add(m22);Menu2.add(m23);Menu2.add(m24);Menu3.add(m31);Menu3.add(m32);Menu3.add(m33);Menu4.add(m41);Menu5.add(m51);Menu6.add(m61);Menu6.add(m62);                          JToolBar toolBar=new JToolBar("tool");toolBar.setVisible(true);                                                  JButton btPre=new JButton("前进");JButton btBack=new JButton("后退");JButton btUp=new JButton("向上");JButton btFiles=new JButton("文件夹");JButton btSrarch=new JButton("搜索");toolBar.add(btPre);toolBar.add(btBack);toolBar.add(btUp);toolBar.add(btFiles);toolBar.add(btSrarch);setJMenuBar(mBar);this.getContentPane().add(toolBar,BorderLayout.NORTH);       toolBar.setFloatable(true);            this.setVisible(true);           DefaultMutableTreeNode top = new DefaultMutableTreeNode(new IconData(ICON_COMPUTER, null, "我的电脑"));DefaultMutableTreeNode node;File[] roots = File.listRoots();for (int k=0; k<roots.length; k++){node = new DefaultMutableTreeNode(new IconData(ICON_DISK,null, new FileNode(roots[k])));top.add(node);node.add(new DefaultMutableTreeNode(new Boolean(true)));}m_model = new DefaultTreeModel(top);m_tree = new JTree(m_model);m_tree.putClientProperty("JTree.lineStyle", "Angled");TreeCellRenderer renderer = newIconCellRenderer();m_tree.setCellRenderer(renderer);m_tree.addTreeExpansionListener(newDirExpansionListener());m_tree.addTreeSelectionListener(newDirSelectionListener());m_tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);m_tree.setShowsRootHandles(true);m_tree.setEditable(false);JScrollPane s = new JScrollPane();s.getViewport().add(m_tree);m_area = new JTextArea();m_area.setEditable(false);JScrollPane sarea = new JScrollPane();sarea.getViewport().add(m_area);JSplitPane jp = new JSplitPane (JSplitPane.HORIZONTAL_SPLIT,true,s,sarea);getContentPane().add(jp,BorderLayout.CENTER);  m_display = new JTextField();m_display.setEditable(false);getContentPane().add(m_display, BorderLayout.SOUTH);WindowListener wndCloser = new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}};addWindowListener(wndCloser);setVisible(true);}    public void actionPerformed(ActionEvent e){if(e.getActionCommand().equals("退出"))   System.exit(0);    }DefaultMutableTreeNode getTreeNode(TreePath path){return (DefaultMutableTreeNode)(path.getLastPathComponent());}FileNode getFileNode(DefaultMutableTreeNode node){if (node == null)return null;Object obj = node.getUserObject();if (obj instanceof IconData)obj = ((IconData)obj).getObject();if (obj instanceof FileNode)return (FileNode)obj;elsereturn null;}class DirExpansionListener implements TreeExpansionListener{public void treeExpanded(TreeExpansionEvent event){final DefaultMutableTreeNode node = getTreeNode(event.getPath());final FileNode fnode = getFileNode(node);Thread runner = new Thread(){public void run(){if (fnode != null && fnode.expand(node)){Runnable runnable = new Runnable(){public void run(){m_model.reload(node);}};SwingUtilities.invokeLater(runnable);}}};runner.start();}public void treeCollapsed(TreeExpansionEvent event) {}}class DirSelectionListenerimplements TreeSelectionListener{public void valueChanged(TreeSelectionEvent event){DefaultMutableTreeNode node = getTreeNode(event.getPath());FileNode fnode = getFileNode(node);if (fnode != null){m_display.setText(fnode.getFile().getAbsolutePath());File f = fnode.getFile();if(f.isFile() && f.getName().endsWith(".java")|| f.getName().endsWith(".txt") || f.getName().endsWith(".conf") ){try{BufferedReader in = new BufferedReader(new FileReader(f.getAbsoluteFile()));String line ;m_area.setText("");while( (line = in.readLine()) != null){m_area.append(line);m_area.append("\n");m_area.setEditable(true);}}catch(IOException e){e.printStackTrace();}}else{m_area.setText(f.toString()+f.lastModified()+f.length());m_area.setEditable(false);}}else{m_display.setText("");}}}public static void main(String argv[]){new FileTree();}}class IconCellRenderer extends JLabel implements TreeCellRenderer{protected Color m_textSelectionColor;protected Color m_textNonSelectionColor;protected Color m_bkSelectionColor;protected Color m_bkNonSelectionColor;protected Color m_borderSelectionColor;protected boolean m_selected;public IconCellRenderer(){super();m_textSelectionColor = UIManager.getColor("Tree.selectionForeground");m_textNonSelectionColor = UIManager.getColor("Tree.textForeground");m_bkSelectionColor = UIManager.getColor("Tree.selectionBackground");m_bkNonSelectionColor = UIManager.getColor("Tree.textBackground");m_borderSelectionColor = UIManager.getColor("Tree.selectionBorderColor");setOpaque(false);}public Component getTreeCellRendererComponent(JTree tree,Object value, boolean sel, boolean expanded, boolean leaf,int row, boolean hasFocus){DefaultMutableTreeNode node =(DefaultMutableTreeNode)value;Object obj = node.getUserObject();setText(obj.toString());if (obj instanceof Boolean)setText("Retrieving data...");if (obj instanceof IconData){IconData idata = (IconData)obj;if (expanded)setIcon(idata.getExpandedIcon());elsesetIcon(idata.getIcon());}elsesetIcon(null);setFont(tree.getFont());setForeground(sel ? m_textSelectionColor :m_textNonSelectionColor);setBackground(sel ? m_bkSelectionColor :m_bkNonSelectionColor);m_selected = sel;return this;}public void paintComponent(Graphics g){Color bColor = getBackground();Icon icon = getIcon();g.setColor(bColor);int offset = 0;if(icon != null && getText() != null)offset = (icon.getIconWidth() + getIconTextGap());g.fillRect(offset, 0, getWidth() - 1 - offset,getHeight() - 1);if (m_selected){g.setColor(m_borderSelectionColor);g.drawRect(offset, 0, getWidth()-1-offset, getHeight()-1);}super.paintComponent(g);}}class IconData{protected Icon   m_icon;protected Icon   m_expandedIcon;protected Object m_data;public IconData(Icon icon, Object data){m_icon = icon;m_expandedIcon = null;m_data = data;}public IconData(Icon icon, Icon expandedIcon, Object data){m_icon = icon;m_expandedIcon = expandedIcon;m_data = data;}public Icon getIcon(){return m_icon;}public Icon getExpandedIcon(){return m_expandedIcon!=null ? m_expandedIcon : m_icon;}public Object getObject(){return m_data;}public String toString(){return m_data.toString();}}class FileNode{protected File m_file;public FileNode(File file){m_file = file;}public File getFile(){return m_file;}public String toString(){return m_file.getName().length() > 0 ? m_file.getName() :m_file.getPath();}public boolean expand(DefaultMutableTreeNode parent){DefaultMutableTreeNode flag =(DefaultMutableTreeNode)parent.getFirstChild();if (flag==null)return false;Object obj = flag.getUserObject(); if (!(obj instanceof Boolean))return false;      parent.removeAllChildren(); File[] files = listFiles();                                     if (files == null)return true;Vector v = new Vector();for (int k=0; k<files.length; k++){File f = files[k];FileNode newNode = new FileNode(f);boolean isAdded = false;for (int i=0; i<v.size(); i++){FileNode nd = (FileNode)v.elementAt(i);if (newNode.compareTo(nd) < 0){v.insertElementAt(nd, i);isAdded = true;break;}}if (!isAdded)v.addElement(newNode);}for (int i=0; i<v.size(); i++){     IconData idata;FileNode fnd = (FileNode)v.elementAt(i);if (fnd.hasSubDirs())idata = new IconData(FileTree.ICON_FOLDER,FileTree.ICON_EXPANDEDFOLDER, fnd);elseidata = new IconData(FileTree.ICON_File,fnd);  DefaultMutableTreeNode node = new DefaultMutableTreeNode(idata);parent.add(node);if (fnd.hasSubDirs())node.add(new DefaultMutableTreeNode(new Boolean(true)));}return true;}public boolean hasSubDirs() {File[] files = listFiles();if (files == null)return false;elsereturn true;}public int compareTo(FileNode toCompare){return  m_file.getName().compareToIgnoreCase(toCompare.m_file.getName());}protected File[] listFiles(){if (!m_file.isDirectory())return null;try{return m_file.listFiles();}catch (Exception ex){JOptionPane.showMessageDialog(null,"Error reading directory "+m_file.getAbsolutePath(),"Warning", JOptionPane.WARNING_MESSAGE);return null;}}}