jfilechooserdemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.filechooser.FileFilter;
import java.io.File;
import java.awt.*;
import java.awt.event.*;

public class JFileChooserDemo extends JFrame implements ActionListener {

	private JLabel jlb;

	private FileChooserEx jfc;

	public JFileChooserDemo() {
		jlb = new JLabel();
		jfc = new FileChooserEx(jlb);
		TestFileFilter filter = new TestFileFilter();
		jfc.addChoosableFileFilter(filter);
		JButton jbt = new JButton("打开");
		jbt.addActionListener(this);
		getContentPane().add(jlb, BorderLayout.CENTER);
		getContentPane().add(jbt, BorderLayout.NORTH);
	}

	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		jfc.showOpenDialog(this);

	}

	public static void main(String[] args) {
		JFileChooserDemo test = new JFileChooserDemo();
		test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		test.setSize(300, 300);
		test.setVisible(true);
	}

}

class FileChooserEx extends JFileChooser {
	private JLabel jlb;

	public FileChooserEx(JLabel lb) {
		jlb = lb;
	}

	public void approveSelection() {
		jlb.setText("您打开了： " + getSelectedFile().getAbsolutePath());
		getTopLevelAncestor().setVisible(false);
	}
}

class TestFileFilter extends FileFilter {

	public boolean accept(File f) {

		return (f.isDirectory() || f.getName().endsWith(".txt"));
	}

	public String getDescription() {

		return ("Text files (*.txt)");
	}

}