JTree如何显示文件名？

在我的项目中，我正在尝试添加文件资源pipe理器，以便用户可以从给定目录中select文件。 我想限制这个视图到项目的根文件夹（由用户决定）。 这与Eclipses Package Explorer非常相似，因为“工作空间”是由用户决定的。

目前文件不显示完整的path（从C :)这是我想要的，但所有的文件夹显示完整的path（我不想要的，我只是想要的文件夹名称）。

那么JTree如何显示这些名字呢？

我已经看到JTree使用File.tostring（）方法，但是当我实现自己的文件并覆盖toString方法时，没有任何改变。

这是我的代码：

import java.awt.BorderLayout; import java.io.File; import javax.swing.JFileChooser; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.event.TreeModelListener; import javax.swing.tree.TreeModel; import javax.swing.tree.TreePath; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.util.Collections; import java.util.Vector; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; public class pnl_fileView extends JPanel { /** * Display a file system in a JTree view * * @version $Id: FileTree.java,v 1.9 2004/02/23 03:39:22 ian Exp $ * @author Ian Darwin */ /** Construct a FileTree */ // public pnl_fileView(){ private myFile projectFile; public pnl_fileView(myFile dir) { //Create file explorer //Need to add setup for root folder change. //Config.getProject(); //This gets the current file from the config file. //Begin choose File if(projectFile == null){ JFileChooser chooser; String choosertitle = "Please Choose a Root Folder"; chooser = new JFileChooser(); chooser.setCurrentDirectory(new java.io.File(".")); chooser.setDialogTitle(choosertitle); chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); // // disable the "All files" option. // chooser.setAcceptAllFileFilterUsed(false); // if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) { System.out.println("getCurrentDirectory(): " + chooser.getCurrentDirectory()); System.out.println("getSelectedFile() : " + chooser.getSelectedFile()); projectFile = new myFile(chooser.getSelectedFile().getAbsolutePath()); //projectFile = chooser.getSelectedFile(); } else { System.out.println("No Selection "); } } else { // Figure out where in the filesystem to start displaying } //End choose file setLayout(new BorderLayout()); // Make a tree list with all the nodes, and make it a JTree JTree tree = new JTree(addNodes(null, projectFile)); // Add a listener tree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent e) { DefaultMutableTreeNode node = (DefaultMutableTreeNode) e .getPath().getLastPathComponent(); System.out.println("You selected " + node); } }); // Lastly, put the JTree into a JScrollPane. JScrollPane scrollpane = new JScrollPane(); scrollpane.getViewport().add(tree); add(BorderLayout.CENTER, scrollpane); } /** Add nodes from under "dir" into curTop. Highly recursive. */ DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, myFile dir) { String curPath = dir.getPath(); System.out.println(curPath); DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath); if (curTop != null) { // should only be null at root curTop.add(curDir); } Vector<String> ol = new Vector<String>(); String[] tmp = dir.list(); for (int i = 0; i < tmp.length; i++) ol.addElement(tmp[i]); Collections.sort(ol, String.CASE_INSENSITIVE_ORDER); myFile f; Vector<String> files = new Vector<String>(); // Make two passes, one for Dirs and one for Files. This is #1. for (int i = 0; i < ol.size(); i++) { String thisObject = (String) ol.elementAt(i); String newPath; if (curPath.equals(".")) newPath = thisObject; else newPath = curPath + myFile.separator + thisObject; System.out.println("this is the path: " + newPath); if ((f = new myFile(newPath)).isDirectory()) addNodes(curDir, f); else files.addElement(thisObject); } // Pass two: for files. for (int fnum = 0; fnum < files.size(); fnum++) curDir.add(new DefaultMutableTreeNode(files.elementAt(fnum))); return curDir; } public Dimension getMinimumSize() { return new Dimension(200, 400); } public Dimension getPreferredSize() { return new Dimension(200, 400); } /** Main: make a Frame, add a FileTree */ public static void main(String[] av) { JFrame frame = new JFrame("FileTree"); frame.setForeground(Color.black); frame.setBackground(Color.lightGray); Container cp = frame.getContentPane(); if (av.length == 0) { cp.add(new pnl_fileView(new myFile("."))); } else { cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS)); for (int i = 0; i < av.length; i++) cp.add(new pnl_fileView(new myFile(av[i]))); } frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } class myFile extends File{ public myFile(String pathname) { super(pathname); } public String toString() { return "Hello World!"; } public String getAbsolutePath(){ return "hi"; } } 

Answer 1

除JFileChooser ，其他自定义Java文件浏览器的示例还包括：

• FileBrowserGUI 。

• org.netbeans.swing.outline.Outline与FileTreeModel 。

• JTree与FileTreeModel ， 在这里描述。

• PanelBrowser 。

• Java文件pipe理器 。

Answer 2

就个人而言，我不会尝试使用其他对象来设置节点的显示值，我会把它留给TreeCellRenderer来决定。 主要原因是节点包含的数据可能需要程序的其他部分。

 import java.io.File; import javax.swing.JFileChooser; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.event.TreeModelListener; import javax.swing.tree.TreeModel; import javax.swing.tree.TreePath; import java.awt.Color; import java.awt.Component; import java.awt.Container; import java.awt.Dimension; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.Vector; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.filechooser.FileSystemView; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; public class TestFileTree extends JPanel { private File projectFile; public TestFileTree(File dir) { //Create file explorer //Need to add setup for root folder change. //Config.getProject(); //This gets the current file from the config file. //Begin choose File if (projectFile == null) { JFileChooser chooser; String choosertitle = "Please Choose a Root Folder"; chooser = new JFileChooser(); chooser.setCurrentDirectory(new java.io.File(".")); chooser.setDialogTitle(choosertitle); chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); // // disable the "All files" option. // chooser.setAcceptAllFileFilterUsed(false); // if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) { System.out.println("getCurrentDirectory(): " + chooser.getCurrentDirectory()); System.out.println("getSelectedFile() : " + chooser.getSelectedFile()); projectFile = new File(chooser.getSelectedFile().getAbsolutePath()); //projectFile = chooser.getSelectedFile(); } else { System.out.println("No Selection "); } } else { // Figure out where in the filesystem to start displaying } //End choose file setLayout(new BorderLayout()); // Make a tree list with all the nodes, and make it a JTree JTree tree = new JTree(addNodes(null, projectFile)); tree.setCellRenderer(new MyTreeCellRenderer()); // Add a listener tree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent e) { DefaultMutableTreeNode node = (DefaultMutableTreeNode) e .getPath().getLastPathComponent(); System.out.println("You selected " + node); } }); // Lastly, put the JTree into a JScrollPane. JScrollPane scrollpane = new JScrollPane(); scrollpane.getViewport().add(tree); add(BorderLayout.CENTER, scrollpane); } /** * Add nodes from under "dir" into curTop. Highly recursive. */ DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) { DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(dir); if (curTop != null) { // should only be null at root curTop.add(curDir); } File[] tmp = dir.listFiles(); Vector<File> ol = new Vector<File>(); ol.addAll(Arrays.asList(tmp)); Collections.sort(ol, new Comparator<File>() { @Override public int compare(File o1, File o2) { int result = o1.getName().compareTo(o2.getName()); if (o1.isDirectory() && o2.isFile()) { result = -1; } else if (o2.isDirectory() && o1.isFile()) { result = 1; } return result; } }); // Pass two: for files. for (int fnum = 0; fnum < ol.size(); fnum++) { File file = ol.elementAt(fnum); DefaultMutableTreeNode node = new DefaultMutableTreeNode(file); if (file.isDirectory()) { addNodes(node, file); } curDir.add(node); } return curDir; } public Dimension getMinimumSize() { return new Dimension(200, 400); } public Dimension getPreferredSize() { return new Dimension(200, 400); } public static void main(String[] av) { JFrame frame = new JFrame("FileTree"); frame.setForeground(Color.black); frame.setBackground(Color.lightGray); Container cp = frame.getContentPane(); if (av.length == 0) { cp.add(new TestFileTree(new File("."))); } else { cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS)); for (int i = 0; i < av.length; i++) { cp.add(new TestFileTree(new File(av[i]))); } } frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public class MyTreeCellRenderer extends DefaultTreeCellRenderer { private FileSystemView fsv = FileSystemView.getFileSystemView(); @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) { System.out.println(value); super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus); if (value instanceof DefaultMutableTreeNode) { value = ((DefaultMutableTreeNode)value).getUserObject(); if (value instanceof File) { File file = (File) value; if (file.isFile()) { setIcon(fsv.getSystemIcon(file)); setText(file.getPath()); } else { setIcon(fsv.getSystemIcon(file)); setText(file.getName()); } } } return this; } } } 

你的代码有一些“有趣”的部分。

虽然Vector并不是一个不错的select，但是List （或者在这种情况下，特别是ArrayList ）更快，因为它不是同步的。

而不是使用循环来添加元素到列表中，使用Arrays.asList(...)将数组转换为列表并使用List#addAll方法（它也在Vector中）

我不确定你使用的是什么版本的Java，但是现在可以使用for-each 6以来for-each （我认为），这意味着代替for (int i = 0; i < ol.size(); i++)可以for (int i = 0; i < ol.size(); i++)你可以做for (String thisObject : ol) 。

因为您在列表中使用generics，所以不需要投射对象;）