Java 如何在JTree中显示文件夹的内容?
我试图实现的是采用预定义的文件路径,并在JTree中显示该文件路径中的每个文件夹和文件 简单地Java 如何在JTree中显示文件夹的内容?,java,swing,user-interface,Java,Swing,User Interface,我试图实现的是采用预定义的文件路径,并在JTree中显示该文件路径中的每个文件夹和文件 简单地 Folder1 Folder2 Folder3a ->File3a ->File2a ->File2b 到目前为止,我掌握的情况如下: public class GUI extends JPanel { public GUI() { super(new GridLayout(1, 2, 20, 0)); setBorder
Folder1
Folder2
Folder3a
->File3a
->File2a
->File2b
到目前为止,我掌握的情况如下:
public class GUI extends JPanel {
public GUI() {
super(new GridLayout(1, 2, 20, 0));
setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 10));
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (final Exception ignored) {
}
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.setContentPane(this);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
我想知道如何进行。到目前为止,所有这些都是我读过的大量阅读资料的汇编,我真的不知道如何实现我的目标。公共类文件树扩展了JPanel{
public class FileTree extends JPanel {
/** Construct a FileTree */
public FileTree(File dir) {
setLayout(new BorderLayout());
// Make a tree list with all the nodes, and make it a JTree
JTree tree = new JTree(addNodes(null, dir));
// 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) {
String curPath = dir.getPath();
DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
if (curTop != null) { // should only be null at root
curTop.add(curDir);
}
Vector ol = new Vector();
String[] tmp = dir.list();
for (int i = 0; i < tmp.length; i++)
ol.addElement(tmp[i]);
Collections.sort(ol, String.CASE_INSENSITIVE_ORDER);
File f;
Vector files = new Vector();
// 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 + File.separator + thisObject;
if ((f = new File(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 FileTree(new File(".")));
} else {
cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS));
for (int i = 0; i < av.length; i++)
cp.add(new FileTree(new File(av[i])));
}
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
/**构建一个文件树*/
公共文件树(文件目录){
setLayout(新的BorderLayout());
//制作一个包含所有节点的树列表,并使其成为JTree
JTree树=新的JTree(addNodes(null,dir));
//添加一个侦听器
addTreeSelectionListener(新建TreeSelectionListener()){
公共作废值已更改(TreeSelection事件e){
DefaultMutableTreeNode=(DefaultMutableTreeNode)e
.getPath().getLastPathComponent();
System.out.println(“您选择了”+节点);
}
});
//最后,将JTree放入JScrollPane中。
JScrollPane scrollpane=新的JScrollPane();
scrollpane.getViewport().add(树);
添加(BorderLayout.CENTER,滚动窗格);
}
/**将“dir”下的节点添加到curTop中。高度递归*/
DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop,文件目录){
字符串curPath=dir.getPath();
DefaultMutableTreeNode curDir=新的DefaultMutableTreeNode(curPath);
if(curTop!=null){//只应在根处为null
curTop.add(curDir);
}
向量ol=新向量();
字符串[]tmp=dir.list();
for(int i=0;i
如果我沿着这条路线走下去,那就又提出了一个问题;1) 如何获取根目录下所有文件的路径?请查看@andrewhompson以了解一些想法