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<TD><B> <SPAN
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選擇自 <A id=ArticleTitle1_ArticleTitle1_AuthorLink
href="http://dev.csdn.net/user/jackkui">jackkui</A> 的 Blog
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<TD align=middle bgColor=#003399 height=16><FONT
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<P>看到很多人問關于用JTree實現資源管理器的方法，在這里我提供一個例子共大家參考，這個例子雖然也是轉自其他書，但是JTree的用法，我掌握的差不多了，如果哪位朋友，對此例子有問題，我愿意與他交流。我的email是：<A
href="mailto:jack_kui@126.com">jack_kui@126.com</A>這個例子涵蓋了JTree的大部分屬性，希望對大家能夠有所幫助。需要一些圖標文件，請大家自己復制好相同名字的gif圖片放到目錄下。</P>
<P>下面是源代碼:</P>
<P>import java.awt.*;<BR>import java.awt.event.*;<BR>import
java.io.*;<BR>import java.util.*;</P>
<P>import javax.swing.*;<BR>import javax.swing.tree.*;<BR>import
javax.swing.event.*;</P>
<P>public class FileTree1 <BR> extends JFrame
<BR>{<BR> public static final ImageIcon ICON_COMPUTER =
<BR> new ImageIcon("computer.gif");<BR> public
static final ImageIcon ICON_DISK = <BR> new
ImageIcon("disk.gif");<BR> public static final ImageIcon
ICON_FOLDER = <BR> new
ImageIcon("folder.gif");<BR> public static final ImageIcon
ICON_EXPANDEDFOLDER = <BR> new
ImageIcon("expandedfolder.gif");</P>
<P> protected JTree m_tree;<BR> protected
DefaultTreeModel m_model;<BR> protected JTextField
m_display;</P>
<P> public
FileTree1()<BR> {<BR> super("Directories
Tree");<BR> setSize(400, 300);</P>
<P> DefaultMutableTreeNode top = new
DefaultMutableTreeNode(<BR> new
IconData(ICON_COMPUTER, null, "Computer"));</P>
<P> DefaultMutableTreeNode node;<BR> File[]
roots = File.listRoots();<BR> for (int k=0;
k<roots.length; k++)<BR> {<BR> node =
new DefaultMutableTreeNode(new IconData(ICON_DISK,
<BR> null, new
FileNode(roots[k])));<BR> top.add(node);<BR>
node.add( new DefaultMutableTreeNode(new
Boolean(true)));<BR> }</P>
<P> m_model = new
DefaultTreeModel(top);<BR> m_tree = new
JTree(m_model);</P>
<P>
m_tree.putClientProperty("JTree.lineStyle", "Angled");</P>
<P> TreeCellRenderer renderer = new
<BR> IconCellRenderer();<BR> m_tree.setCellRenderer(renderer);</P>
<P> m_tree.addTreeExpansionListener(new
<BR> DirExpansionListener());</P>
<P> m_tree.addTreeSelectionListener(new
<BR> DirSelectionListener());</P>
<P> m_tree.getSelectionModel().setSelectionMode(<BR> TreeSelectionModel.SINGLE_TREE_SELECTION);
<BR> m_tree.setShowsRootHandles(true);
<BR> m_tree.setEditable(false);</P>
<P> JScrollPane s = new
JScrollPane();<BR> s.getViewport().add(m_tree);<BR> getContentPane().add(s,
BorderLayout.CENTER);</P>
<P> m_display = new
JTextField();<BR> m_display.setEditable(false);<BR> getContentPane().add(m_display,
BorderLayout.NORTH);</P>
<P> WindowListener wndCloser = new
WindowAdapter()<BR> {<BR> public void
windowClosing(WindowEvent e)
<BR> {<BR> System.exit(0);<BR> }<BR> };<BR> addWindowListener(wndCloser);<BR> <BR> setVisible(true);<BR> }</P>
<P> DefaultMutableTreeNode getTreeNode(TreePath
path)<BR> {<BR> return
(DefaultMutableTreeNode)(path.getLastPathComponent());<BR> }</P>
<P> FileNode getFileNode(DefaultMutableTreeNode
node)<BR> {<BR> if (node ==
null)<BR> return null;<BR> Object obj =
node.getUserObject();<BR> if (obj instanceof
IconData)<BR> obj =
((IconData)obj).getObject();<BR> if (obj instanceof
FileNode)<BR> return
(FileNode)obj;<BR> else<BR> return
null;<BR> }</P>
<P> // Make sure expansion is threaded and
updating the tree model<BR> // only occurs within
the event dispatching thread.<BR> class
DirExpansionListener implements
TreeExpansionListener<BR>
{<BR> public void
treeExpanded(TreeExpansionEvent
event)<BR>
{<BR>
final DefaultMutableTreeNode node =
getTreeNode(<BR>
event.getPath());<BR>
final FileNode fnode = getFileNode(node);</P>
<P>
Thread runner = new Thread()
<BR>
{<BR>
public void run()
<BR>
{<BR>
if (fnode != null && fnode.expand(node))
<BR>
{<BR>
Runnable runnable = new Runnable()
<BR>
{<BR>
public void run()
<BR>
{<BR>
m_model.reload(node);<BR>
}<BR>
};<BR>
SwingUtilities.invokeLater(runnable);<BR>
}<BR>
}<BR>
};<BR>
runner.start();<BR> }</P>
<P> public void
treeCollapsed(TreeExpansionEvent event) {}<BR>
}</P>
<P><BR> class DirSelectionListener <BR> implements
TreeSelectionListener <BR> {<BR> public void
valueChanged(TreeSelectionEvent
event)<BR> {<BR> DefaultMutableTreeNode
node =
getTreeNode(<BR> event.getPath());<BR> FileNode
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