example06_displayfile.java

java课程设计教材上的程例题序代码

package example;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;

public class Example06_DisplayFile {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			JFileChooser fileChooser = new JFileChooser(".");
			FileNameExtensionFilter filter = new FileNameExtensionFilter("JAVA file", new String[]{"java"});
			fileChooser.addChoosableFileFilter(filter);
			File file = null;
			if (JFileChooser.APPROVE_OPTION == fileChooser.showOpenDialog(null)) {
				file = fileChooser.getSelectedFile();
				BufferedReader reader = new BufferedReader(new FileReader(file));
				String mes = "", s;
				while ((s = reader.readLine()) != null) {
					mes += s + "\n";
				}
				reader.close();

				JOptionPane.showMessageDialog(null, mes);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}