Question

我已经使用Java2s.com中的代码显示我的主目录的文件树。我想让用户选择包含我的程序将使用的信息的目录。我做了很多次尝试（这里列出太多）以使树只显示非隐藏目录。文件和隐藏目录不会显示在树上。

有办法做到这一点吗？我花了很多时间在这上面却没有成功。有没有办法拦截最终显示器的样子？也许渲染器可以询问树并删除属于isHidden()？

的节点

public class FileTreeDemo {

    static File root;
    static FileTreeModel model;

    public static void main(String[] args) {
        // Figure out where in the filesystem to start displaying

        if (args.length > 0) {
            root = new File(args[0]);
        } else {
            root = new File(System.getProperty("user.home"));
        }

        // Create a TreeModel object to represent our tree of files
        model = new FileTreeModel(root);

        // Create a JTree and tell it to display our model
        JTree tree = new JTree();
        tree.setModel(model);

        // The JTree can get big, so allow it to scroll
        JScrollPane scrollpane = new JScrollPane(tree);

        // Display it all in a window and make the window appear
        JFrame frame = new JFrame("FileTreeDemo");
        frame.getContentPane().add(scrollpane, "Center");
        frame.setSize(400, 600);
        frame.setVisible(true);
    }

    /**
     * The methods in this class allow the JTree component to traverse the file
     * system tree and display the files and directories.
     *
     */
    static class FileTreeModel implements TreeModel {

        // We specify the root directory when we create the model.
        protected File root;

        public FileTreeModel(File root) {
            this.root = root;
        }

        // The model knows how to return the root object of the tree
        public Object getRoot() {
            return root;
        }

        // Tell JTree whether an object in the tree is a leaf
        @Override
      public boolean isLeaf(Object node) { 

          return ((File)node).isFile(); 
      }            
        // Tell JTree how many children a node has
        public int getChildCount(Object parent) {
            String[] children = ((File) parent).list();
            if (children == null) {
                return 0;
            }
            return children.length;
        }

        // Fetch any numbered child of a node for the JTree.
        // Our model returns File objects for all nodes in the tree.  The
        // JTree displays these by calling the File.toString() method.
        public Object getChild(Object parent, int index) {               

            String[] children = ((File) parent).list();


            if ((children == null) || (index >= children.length)) {
                return null;
            }
            return new File((File) parent, children[index]);
        }
        // Figure out a child's position in its parent node.
        @Override
        public int getIndexOfChild(Object parent, Object child) {

            String[] children = ((File) parent).list();
            if (children == null) {
                return -1;
            }
            String childname = ((File) child).getName();
            for (int i = 0; i < children.length; i++) {
                if (childname.equals(children[i])) {
                    return i;
                }
            }
            return -1;
        }

        // This method is invoked by the JTree only for editable trees.  
        // This TreeModel does not allow editing, so we do not implement 
        // this method.  The JTree editable property is false by default.
        public void valueForPathChanged(TreePath path, Object newvalue) {
        }

        // Since this is not an editable tree model, we never fire any events,
        // so we don't actually have to keep track of interested listeners
        public void addTreeModelListener(TreeModelListener l) {
        }

        public void removeTreeModelListener(TreeModelListener l) {
        }
    }
}

Answer 1

由模型忽略隐藏文件。渲染器的工作仅显示，不应干扰数据选择和过滤。例如，您可以在模型中使用File.listFiles(FileFilter filter)：

private static final File[] EMPTY_LIST = {};

private File[] getFiles(File parent) {
    File[] files = parent.listFiles(new FileFilter() {
        @Override
        public boolean accept(File file) {
            return !file.isHidden();
        }
    });
    return files != null ? files : EMPTY_LIST;
}

@Override
public int getChildCount(Object parent) {
    return getFiles((File) parent).length;
}

@Override
public Object getChild(Object parent, int index) {
    return getFiles((File) parent)[index];
}

@Override
public int getIndexOfChild(Object parent, Object child) {
    File[] files = getFiles((File) parent);
    for (int idx = 0; idx < files.length; idx++) {
        if (files[idx].equals(child))
            return idx;
    }
    return -1;
}

隐藏Swing JTree中的文件和隐藏目录

1 个答案: