Java源码-目录遍历

如果要导出文件夹下的文件目录，可使用DOS的tree命令。

当然，你也可以使用Java程序。

代码如下：

package example;//Fig. 15.12: JFileChooserDemo.java//Demonstrating JFileChooser.import java.io.IOException;import java.nio.file.DirectoryStream;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;public class JFileChooserDemo extends JFrame{private final JTextArea outputArea; // displays file contents// set up GUIpublic JFileChooserDemo() throws IOException{   super("JFileChooser Demo");   outputArea = new JTextArea();   add(new JScrollPane(outputArea)); // outputArea is scrollable   analyzePath(); // get Path from user and display info} // display information about file or directory user specifiespublic void analyzePath() throws IOException{   // get Path to user-selected file or directory   Path path = getFileOrDirectoryPath();   if (path != null && Files.exists(path)) // if exists, display info   {      // gather file (or directory) information      StringBuilder builder = new StringBuilder();      builder.append(String.format("%s:%n", path.getFileName()));   builder.append(String.format("%s a directory%n",    Files.isDirectory(path) ? "Is" : "Is not"));   builder.append(String.format("%s an absolute path%n",    path.isAbsolute() ? "Is" : "Is not"));   builder.append(String.format("Last modified: %s%n",    Files.getLastModifiedTime(path)));   builder.append(String.format("Size: %s%n", Files.size(path)));   builder.append(String.format("Path: %s%n", path));   builder.append(String.format("Absolute path: %s%n",          path.toAbsolutePath()));      if (Files.isDirectory(path)) // output directory listing      {         builder.append(String.format("%nDirectory contents:%n"));                  // object for iterating through a directory's contents         DirectoryStream<Path> directoryStream =             Files.newDirectoryStream(path);         for (Path p : directoryStream)            builder.append(String.format("%s%n", p));      }      outputArea.setText(builder.toString()); // display String content   }    else // Path does not exist   {      JOptionPane.showMessageDialog(this, path.getFileName() +         " does not exist.", "ERROR", JOptionPane.ERROR_MESSAGE);   }   } // end method analyzePath// allow user to specify file or directory nameprivate Path getFileOrDirectoryPath(){   // configure dialog allowing selection of a file or directory   JFileChooser fileChooser = new JFileChooser();   fileChooser.setFileSelectionMode(      JFileChooser.FILES_AND_DIRECTORIES);   int result = fileChooser.showOpenDialog(this);   // if user clicked Cancel button on dialog, return   if (result == JFileChooser.CANCEL_OPTION)      System.exit(1);   // return Path representing the selected file   return fileChooser.getSelectedFile().toPath();} public static void main(String[] args) throws IOException{   JFileChooserDemo application = new JFileChooserDemo();   application.setSize(400, 400);    application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   application.setVisible(true); } } // end class JFileChooserDemo