打开文件和保存文件代码,Java代码库,德仔网

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【Java】打开文件和保存文件
作者:DDT / 发布于2013/1/8/ 580
package bo;

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class MyMenuDemo {

	private Frame f;
	private MenuBar bar;
	private TextArea ta;
	private Menu fileMenu;
	private MenuItem openItem, saveItem, closeItem;
	private FileDialog saveDia, openDia;
	private File file;

	MyMenuDemo() {

		init();

	}

	public void init() {
		f = new Frame("my window");
		f.setBounds(300, 100, 650, 600);
		// f.setLayout(new FlowLayout());

		bar = new MenuBar();

		ta = new TextArea();
		fileMenu = new Menu("文件");
		openItem = new MenuItem("打开");
		saveItem = new MenuItem("保存");
		closeItem = new MenuItem("退出");

		bar.add(fileMenu);
		fileMenu.add(openItem);
		fileMenu.add(saveItem);
		fileMenu.add(closeItem);

		f.setMenuBar(bar);

		openDia = new FileDialog(f, "我要打开", FileDialog.LOAD);
		saveDia = new FileDialog(f, "我要保存", FileDialog.SAVE);

		f.add(ta);
		myEvent();

		f.setVisible(true);

	}

	private void myEvent() {
		saveItem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				if (file == null) {
					saveDia.setVisible(true);
					String dirPath = saveDia.getDirectory();
					String fileName = saveDia.getFile();
					if (dirPath == null || fileName == null)
						return;
					file = new File(dirPath, fileName);
				}

				try {
					BufferedWriter bufw = new BufferedWriter(new FileWriter(
							file));
					String text = ta.getText();
					bufw.write(text);
					bufw.close();

				} catch (IOException e2) {
					throw new RuntimeException();
				}
			}

		});

		openItem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				openDia.setVisible(true);
				String dirPath = openDia.getDirectory();
				String fileName = openDia.getFile();
				System.out.println(dirPath + "...." + fileName);
				if (dirPath == null || fileName == null)
					return;
				ta.setText("");
				File file = new File(dirPath, fileName);

				try {
					BufferedReader bufr = new BufferedReader(new FileReader(
							file));
					String line = null;
					while ((line = bufr.readLine()) != null) {
						ta.append(line + "\r\n");
					}
					bufr.close();
				} catch (IOException ex) {

					throw new RuntimeException("读取失败");
				}

			}
		});

		closeItem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});

		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}

		});
	}

	public static void main(String[] args) {

		new MyMenuDemo();

	}

}
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