如何用JTree做出像类似Windows资源管理器的界面?

Question

http://expert.csdn.net/Expert/topic/1408/1408571.xml?temp=.4313166

Answer 1

我自己写的，不过有问题。我用1.4编译的。
你可以看看，参考一下。
先写个类：
class FileNode extends DefaultMutableTreeNode {
        private boolean explored = false;        public FileNode(File file)  {
                setUserObject(file);
        }
        public boolean getAllowsChildren() { return isDirectory(); }
        public boolean isLeaf()  { return !isDirectory(); }
        public File getFile() { return (File)getUserObject(); }        public boolean isExplored() { return explored; }        public boolean isDirectory() {
                File file = getFile();
                return file.isDirectory();
        }
        public String toString() {
                File file = (File)getUserObject();
                String filename = file.toString();
                int index = filename.lastIndexOf(File.separator);                return (index != -1 && index != filename.length()-1) ?
                                                                        filename.substring(index+1) :
                                                                        filename;
        }
        public void explore() {
                if(!isDirectory())
                        return;                if(!isExplored()) {
                        File file = getFile();
                        File[] children = file.listFiles();                        for(int i=0; i < children.length; ++i)
                                add(new FileNode(children[i]));                        explored = true;
                }
        }
}然后用下面的方法生成tree:private TreeModel createTreeModel() {
          disks = FileSystemView.getFileSystemView().getRoots();
          if(Array.getLength(disks)>1){
                DefaultMutableTreeNode root;
                root = new DefaultMutableTreeNode("My computer");
                for(int i=0; i<Array.getLength(disks); i++){
                     FileNode diskNode = new FileNode(disks[i]);
                     //diskNode.explore();
                     root.add(diskNode);
                }
                return new DefaultTreeModel(root);
          }else{
               FileNode root;
               root = new FileNode(disks[0]);
               return new DefaultTreeModel(root);
          }          //return new DefaultTreeModel(root);
  }主程序中再加上一句：final JTree tree = new JTree(createTreeModel());能不能给200分呀？

Answer 2

还有两段代码，上次忘了。
tree.addTreeSelectionListener(new TreeSelectionListener() {
          public void valueChanged(TreeSelectionEvent e) {
               DefaultMutableTreeNode node = (DefaultMutableTreeNode)
                                                                                                                                         tree.getLastSelectedPathComponent();
               if (node == null) return;
               File nodeInfo = (File)node.getUserObject();
               if (node.isLeaf()) {
                  wholeName = nodeInfo.toString();
                  gotImage = new ImageIcon(wholeName,wholeName);
                  picture.setIcon(gotImage);
                  picture.setPreferredSize(new Dimension(gotImage.getIconWidth(),
                                                                                                                                                                                         gotImage.getIconHeight() ));
                  picture.revalidate();
                  //System.out.println(nodeInfo);
               }else{
                  dirName = nodeInfo.toString();
                  System.out.println(dirName);
                  File[] fileList = FileSystemView.getFileSystemView().getFiles(nodeInfo,true);
                  String temp;
                  String fileName[] = new String[Array.getLength(fileList)];
                  for(int i=0; i<Array.getLength(fileList); i++){
                     temp=fileList[i].toString();
                     //System.out.println(temp);
                     if(dirName.charAt(dirName.length()-1)!='\\'){
                         fileName[i]=temp.substring(dirName.length()+1);
                     }else{
                         fileName[i]=temp.substring(dirName.length());
                     }
                     //System.out.println(fileName[i]);
                  }
                  list.setListData(fileName);
                  //System.out.println(nodeInfo);
               }
         }
     });     tree.addTreeExpansionListener(new TreeExpansionListener(){
         public void treeCollapsed(TreeExpansionEvent e) {}
         public void treeExpanded(TreeExpansionEvent e) {
            UpdateStatus updateThread;
            TreePath path = e.getPath();
            FileNode node = (FileNode)
            path.getLastPathComponent();            if( ! node.isExplored()) {
                DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
                status.setText("exploring ...");                UpdateStatus us = new UpdateStatus();
                us.start();                node.explore();
                model.nodeStructureChanged(node);
            }
        }