FileOpenAndSaveTest.java

package java_GUI;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileFilter;

public class FileOpenAndSaveTest {
	public static void main(String[] args) {
		JFrame f = new JFrame("打开和保存文件");
		f.setLayout(new FlowLayout());
		
		JFileChooser fc = new JFileChooser();

		fc.setFileFilter(new FileFilter() {
			@Override
			public String getDescription() {
				return ".txt";
			}
			@Override
			public boolean accept(File f) {
				return f.getName().toLowerCase().endsWith(".txt");
			}
		});
		JButton bOpen = new JButton("打开文件");
		JButton bSave = new JButton("保存文件");
		f.add(bOpen);
		f.add(bSave);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(250, 150);
		f.setLocationRelativeTo(null);
		f.setVisible(true);
		//打开文件按钮点击监听器
		bOpen.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				int returnVal =  fc.showOpenDialog(f);
				File file = fc.getSelectedFile();
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					JOptionPane.showMessageDialog(f, "计划打开文件:" + file.getAbsolutePath());
				}
			}
		});
		//保存文件按钮点击监听器
		bSave.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				int returnVal =  fc.showSaveDialog(f);
				File file = fc.getSelectedFile();
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					JOptionPane.showMessageDialog(f, "计划保存到文件:" + file.getAbsolutePath());
				}
			}
		});
	}
}