notepadframe.java

介绍有关java的资料 课件 相当一本书籍 里面都是很基础的知识

package notepadshow;

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

/**
 * Title:        Java输入输出演示程序
 * Description:  Java输入输出演示程序，用于北京师范大学计算机系Java课程教学示范。
 * Copyright:    Copyright (c) 2001
 * Company:      北京师范大学计算机系
 * @author 孙一林
 * @version 1.0
 */

public class NotepadFrame extends JFrame {
  JPanel contentPane;
  JToolBar jToolBar = new JToolBar();
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();
  ImageIcon image1;
  ImageIcon image2;
  ImageIcon image3;
  JTextArea jTextArea1 = new JTextArea();
  JFileChooser jFileChooser1 = new JFileChooser();

  /**Construct the frame*/
  public NotepadFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception  {
    image1 = new ImageIcon(notepadshow.NotepadFrame.class.getResource("openFile.gif"));
    image2 = new ImageIcon(notepadshow.NotepadFrame.class.getResource("closeFile.gif"));
    image3 = new ImageIcon(notepadshow.NotepadFrame.class.getResource("help.gif"));
    //setIconImage(Toolkit.getDefaultToolkit().createImage(NotepadFrame.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 300));
    this.setTitle("记事本");
    jButton1.setIcon(image1);
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
    jButton1.setToolTipText("Open File");
    jButton2.setIcon(image2);
    jButton2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton2_actionPerformed(e);
      }
    });
    jButton2.setToolTipText("Close File");
    jButton3.setIcon(image3);
    jButton3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton3_actionPerformed(e);
      }
    });
    jButton3.setToolTipText("Help");
    jTextArea1.setBounds(new Rectangle(0, 31, 400, 269));
    jToolBar.setBounds(new Rectangle(0, 0, 400, 31));
    jFileChooser1.setSelectedFiles(null);
    jFileChooser1.setDialogTitle("");
    jFileChooser1.setAutoscrolls(true);
    jFileChooser1.setToolTipText("");
    jFileChooser1.setBounds(new Rectangle(357, 32, 6, 7));
    jToolBar.add(jButton1);
    jToolBar.add(jButton2);
    jToolBar.add(jButton3);
    contentPane.add(jFileChooser1, null);
    contentPane.add(jTextArea1, null);
    contentPane.add(jToolBar, null);
  }
  /**File | Exit action performed*/
  public void jMenuFileExit_actionPerformed(ActionEvent e) {
    System.exit(0);
  }
  /**Help | About action performed*/
  public void jMenuHelpAbout_actionPerformed(ActionEvent e) {
    NotepadFrame_AboutBox dlg = new NotepadFrame_AboutBox(this);
    Dimension dlgSize = dlg.getPreferredSize();
    Dimension frmSize = getSize();
    Point loc = getLocation();
    dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
    dlg.setModal(true);
    dlg.show();
  }
  /**Overridden so we can exit when window is closed*/
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void jButton3_actionPerformed(ActionEvent e) {
    NotepadFrame_AboutBox dlg = new NotepadFrame_AboutBox(this);
    Dimension dlgSize = dlg.getPreferredSize();
    Dimension frmSize = getSize();
    Point loc = getLocation();
    dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
    dlg.setModal(true);
    dlg.show();
  }

  void jButton1_actionPerformed(ActionEvent e) {
    int val = jFileChooser1.showOpenDialog(this);
    String myFileName = jFileChooser1.getSelectedFile().getName();
    try{
      FileInputStream myfile = new FileInputStream(myFileName);
      byte buff[] = new byte[myfile.available()];
      val = myfile.read(buff);
      myfile.close();
      String s = new String(buff);
      jTextArea1.setText(s);
    }
    catch(IOException ioe){
    }
  }

  void jButton2_actionPerformed(ActionEvent e) {
    int val = jFileChooser1.showSaveDialog(this);
    String myFileName = jFileChooser1.getSelectedFile().getName();
    try{
      File file = new File (myFileName);
      FileWriter outText = new FileWriter(file);
      String text = jTextArea1.getText();
      outText.write(text);
      outText.close();
    }
    catch(IOException ioe){
    }
  }
}