notepadframe.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

/*
 * NotePadFrame.java
 *
 * Created on 2008年4月7日, 上午11:53
 */

package notepad;

import java.awt.event.MouseEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

/**
 *
 * @author  zhaolin
 */
public class NotePadFrame extends javax.swing.JFrame {
    private JFileChooser jfc;
    /** Creates new form NotePadFrame */
    public NotePadFrame() {
        initComponents();
        jfc = new JFileChooser();
        jPopupMenu.add(jMenuItemCopy);
        jPopupMenu.add(jMenuItemPaste);
        jPopupMenu.add(jMenuItemCut);
    }
    
    public StringBuffer getFileStringBuffer(){
        FileReader fr = null;
        StringBuffer sbTemp = null;
        try {

            File currentFile = NotePadModel.getInstane().getCurrentFile();

            if (currentFile == null || !currentFile.exists()) {
                JOptionPane.showMessageDialog(this, "文件不存在！", "错误", JOptionPane.ERROR_MESSAGE);
                return null;
            }
            sbTemp = new StringBuffer();
            fr = new FileReader(currentFile);
            BufferedReader br = new BufferedReader(fr);
            String line = "";
            while((line = br.readLine())!=null){
                sbTemp.append(line+"\r\n");
            }
        }catch (FileNotFoundException ex) {
            Logger.getLogger(NotePadFrame.class.getName()).log(Level.SEVERE, null, ex);
        }catch (IOException ex) {
            Logger.getLogger(NotePadFrame.class.getName()).log(Level.SEVERE, null, ex);
        }  finally {
            try {
                fr.close();
            } catch (IOException ex) {
                Logger.getLogger(NotePadFrame.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        return sbTemp;
    }
    
        public void saveContentToFile(File currentFile){
        PrintWriter pw = null;
        try {
            if (currentFile == null || !currentFile.exists()) {
                JOptionPane.showMessageDialog(this, "文件不存在！", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }
            pw = new PrintWriter(currentFile);
            pw.print(jEditorPaneContent.getText());
        }catch (FileNotFoundException ex) {
            Logger.getLogger(NotePadFrame.class.getName()).log(Level.SEVERE, null, ex);
        }catch (IOException ex) {
            Logger.getLogger(NotePadFrame.class.getName()).log(Level.SEVERE, null, ex);
        }  finally {
                pw.close();
        }
    }
        
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPopupMenu = new javax.swing.JPopupMenu();
        jScrollPane1 = new javax.swing.JScrollPane();
        jEditorPaneContent = new javax.swing.JEditorPane();
        jToolBar1 = new javax.swing.JToolBar();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jSeparator1 = new javax.swing.JToolBar.Separator();
        jMenuBarNotePad = new javax.swing.JMenuBar();
        jMenuFile = new javax.swing.JMenu();
        jMenuItemOpen = new javax.swing.JMenuItem();
        jMenuItemSave = new javax.swing.JMenuItem();
        jMenuItemSaveAs = new javax.swing.JMenuItem();
        jMenuItemExit = new javax.swing.JMenuItem();
        jMenuEdit = new javax.swing.JMenu();
        jMenuItemCopy = new javax.swing.JMenuItem();
        jMenuItemPaste = new javax.swing.JMenuItem();
        jMenuItemCut = new javax.swing.JMenuItem();
        jMenuHelp = new javax.swing.JMenu();
        jMenuItemAbout = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jEditorPaneContent.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                jEditorPaneContentMousePressed(evt);
            }
        });
        jScrollPane1.setViewportView(jEditorPaneContent);

        jToolBar1.setFloatable(false);
        jToolBar1.setRollover(true);

        jButton1.setIcon(new javax.swing.ImageIcon("C:\\open.JPG")); // NOI18N
        jButton1.setToolTipText("打开");
        jButton1.setFocusable(false);
        jButton1.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        jButton1.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        jToolBar1.add(jButton1);

        jButton2.setIcon(new javax.swing.ImageIcon("C:\\save.JPG")); // NOI18N
        jButton2.setToolTipText("保存");
        jButton2.setFocusable(false);
        jButton2.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        jButton2.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
        jToolBar1.add(jButton2);

        jButton3.setIcon(new javax.swing.ImageIcon("C:\\saveas.JPG")); // NOI18N
        jButton3.setToolTipText("另存为");
        jButton3.setFocusable(false);
        jButton3.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        jButton3.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });
        jToolBar1.add(jButton3);
        jToolBar1.add(jSeparator1);

        jMenuFile.setMnemonic('F');
        jMenuFile.setText("File");

        jMenuItemOpen.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_O, java.awt.event.InputEvent.CTRL_MASK));
        jMenuItemOpen.setText("Open");
        jMenuItemOpen.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItemOpenActionPerformed(evt);
            }
        });
        jMenuFile.add(jMenuItemOpen);

        jMenuItemSave.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S, java.awt.event.InputEvent.CTRL_MASK));
        jMenuItemSave.setText("Save");
        jMenuItemSave.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItemSaveActionPerformed(evt);
            }
        });
        jMenuFile.add(jMenuItemSave);

        jMenuItemSaveAs.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S, java.awt.event.InputEvent.SHIFT_MASK | java.awt.event.InputEvent.CTRL_MASK));
        jMenuItemSaveAs.setText("Save as");