如何僅顯示JTree中的目錄？

Question

我想在JTree中只顯示目錄，但我的下面的代碼顯示的是目錄和文件都可以。任何人都可以幫助我只顯示目錄。

//Class1 


public class FileBrowser implements Runnable { 

    private DefaultMutableTreeNode root; 

    private DefaultTreeModel treeModel; 

    private JTree tree; 

    @Override 
    public void run() { 
     JFrame frame = new JFrame("File Browser"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     File fileRoot = new File("C:\\JDeveloper\\Testing"); 
     root = new DefaultMutableTreeNode(new FileNodes(fileRoot)); 
     treeModel = new DefaultTreeModel(root); 

     tree = new JTree(treeModel); 
     tree.setCellRenderer(new DefaultTreeCellRenderer() { 
        private Icon loadIcon = UIManager.getIcon("OptionPane.errorIcon"); 
           private Icon saveIcon = UIManager.getIcon("OptionPane.informationIcon"); 
       @Override 
       public Component getTreeCellRendererComponent(JTree tree, 
              Object value, 
              boolean bSelected, 
              boolean bExpanded, 
              boolean bLeaf, 
              int iRow, 
              boolean bHasFocus) { 
        Component c = super.getTreeCellRendererComponent(tree, value, 
          bSelected, bExpanded, bLeaf, iRow, bHasFocus); 

        return c; 
       } 
      }); 
     tree.setShowsRootHandles(true); 
     JScrollPane scrollPane = new JScrollPane(tree); 

     frame.add(scrollPane); 
     frame.setLocationByPlatform(true); 
     frame.setSize(640, 480); 
     frame.setVisible(true); 

     CreateChildNode ccn = new CreateChildNode(fileRoot, root); 
     new Thread(ccn).start(); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new FileBrowser()); 
    } 
} 

//Class 2 
class CreateChildNode implements Runnable { 

    private DefaultMutableTreeNode root; 

    private File fileRoot; 

    public CreateChildNode(File fileRoot, DefaultMutableTreeNode root) { 
     this.fileRoot = fileRoot; 
     this.root = root; 
    } 

    @Override 
    public void run() { 
     createChildren(fileRoot, root); 
    } 

    private void createChildren(File fileRoot, 
           DefaultMutableTreeNode root) { 

     File[] files = fileRoot.listFiles(); 
         for (File child : files) { 
          System.out.println("Path :" +child.getName()); 
          DefaultMutableTreeNode childNode = 
           new DefaultMutableTreeNode(new FileNodes(child)); 
          System.out.println("Child Node :" +childNode); 
          System.out.println("File :" +child.getAbsoluteFile()); 
          root.add(childNode); 
         if (child.isDirectory()) { 
          createChildren(child, childNode); 
        } 
     }     
    } 

} 

class FileNodes { 

    private File file; 

    public FileNodes(File file) { 
     this.file = file; 
    } 
    public File getFile() { 
      return file; 
     } 

    @Override 
    public String toString() { 
     String name = file.getName(); 
     if (name.equals("")) { 
      return file.getAbsolutePath(); 
     } else { 
      return name; 
     } 
    } 
} 

Answer 1

簡單的檢查目錄前添加到樹

import javax.swing.*; 
import javax.swing.tree.DefaultMutableTreeNode; 
import javax.swing.tree.DefaultTreeCellRenderer; 
import javax.swing.tree.DefaultTreeModel; 
import java.awt.*; 
import java.io.File; 

/** 
* Created by keshan on 7/26/2016. 
*/ 
public class FileBrowser implements Runnable { 

    private DefaultMutableTreeNode root; 

    private DefaultTreeModel treeModel; 

    private JTree tree; 

    @Override 
    public void run() { 
     JFrame frame = new JFrame("File Browser"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     File fileRoot = new File("C:"); 
     root = new DefaultMutableTreeNode(new FileNodes(fileRoot)); 
     treeModel = new DefaultTreeModel(root); 

     tree = new JTree(treeModel); 
     tree.setCellRenderer(new DefaultTreeCellRenderer() { 
      private Icon loadIcon = UIManager.getIcon("OptionPane.errorIcon"); 
      private Icon saveIcon = UIManager.getIcon("OptionPane.informationIcon"); 
      @Override 
      public Component getTreeCellRendererComponent(JTree tree, 
                  Object value, 
                  boolean bSelected, 
                  boolean bExpanded, 
                  boolean bLeaf, 
                  int iRow, 
                  boolean bHasFocus) { 
       Component c = super.getTreeCellRendererComponent(tree, value, 
         bSelected, bExpanded, false, iRow, bHasFocus); 

       return c; 
      } 
     }); 
     tree.setShowsRootHandles(true); 
     JScrollPane scrollPane = new JScrollPane(tree); 

     frame.add(scrollPane); 
     frame.setLocationByPlatform(true); 
     frame.setSize(640, 480); 
     frame.setVisible(true); 

     CreateChildNode ccn = new CreateChildNode(fileRoot, root); 
     new Thread(ccn).start(); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new FileBrowser()); 
    } 
} 

class CreateChildNode implements Runnable { 

    private DefaultMutableTreeNode root; 

    private File fileRoot; 

    public CreateChildNode(File fileRoot, DefaultMutableTreeNode root) { 
     this.fileRoot = fileRoot; 
     this.root = root; 
    } 

    @Override 
    public void run() { 
     createChildren(fileRoot, root); 
    } 

    private void createChildren(File fileRoot, DefaultMutableTreeNode root) 
    { 
     File[] files = fileRoot.listFiles(); 
     if (files != null) 
     { 
      for(File child : files) 
      { 
       DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(new FileNodes(child)); 
       if(child.isDirectory()) 
       { 
        root.add(childNode); 
        createChildren(child, childNode); 
       } 
      } 
     } 
    } 

} 

class FileNodes { 

    private File file; 

    public FileNodes(File file) { 
     this.file = file; 
    } 
    public File getFile() { 
     return file; 
    } 

    @Override 
    public String toString() { 
     String name = file.getName(); 
     if (name.equals("")) { 
      return file.getAbsolutePath(); 
     } else { 
      return name; 
     } 
    } 
} 

Answer 2

您可以用Java做如下

File file=new File("PATH_TO_FILE"); 

String directories[]=file.list(new FilenameFilter() 
{ 
    public boolean accept(File yourFile, String name) { 
    return new File(yourFile, name).isDirectory(); 
    } 

}