Demonstrating JFileChooser - Java Swing

Java examples for Swing:JFileChooser

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Description

Demonstrating JFileChooser

Demo Code

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

class JFileChooserDemo extends JFrame {
  final JTextArea outputArea = new JTextArea();

  public JFileChooserDemo() throws IOException {
    add(new JScrollPane(outputArea)); // outputArea is scrollable
    analyzePath(); // get Path from user and display info
  }/*from   ww  w.  jav a  2s  .com*/
  // display information about file or directory user specifies
  public 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);
    }
  }

  // allow user to specify file or directory name
  private 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 class Main {
  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);
  }
}

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