main.java

需解压后再执行！ 是我的大作业

                return "Text Files";
            }
        });
        int saveResult = chooser.showSaveDialog(Main.this);
        if (saveResult == JFileChooser.APPROVE_OPTION) {
            try {
                write = new PrintWriter(new FileOutputStream(chooser
                        .getSelectedFile().getName()), true);
                write.println(text.getText());
            } catch (Exception e) {
                JOptionPane.showMessageDialog(Main.this, "文件不能保存",
                        "保存文件", JOptionPane.ERROR_MESSAGE);
                e.printStackTrace();
            }
        } else {
            JOptionPane.showMessageDialog(Main.this, "请用户保存需要的文件",
                    "保存文件", JOptionPane.WARNING_MESSAGE);
        }
    }
    private void saveDialog() {
        chooser.setCurrentDirectory(new File("."));
        // 文件过滤
        chooser.setFileFilter(new FileFilter() {
            public boolean accept(File f) {
                String fileName = f.getName().toLowerCase();
                return fileName.endsWith(".txt") || f.isDirectory();
            }
            public String getDescription() {
                return "Text Files";
            }
        });
        int saveResult = chooser.showSaveDialog(Main.this);
        if (saveResult == JFileChooser.APPROVE_OPTION) {
            try {
                write = new PrintWriter(new FileOutputStream(chooser
                        .getSelectedFile().getName()), true);
                write.println(text.getText());
            } catch (Exception e) {
                JOptionPane.showMessageDialog(Main.this, "文件不能保存",
                        "保存文件", JOptionPane.ERROR_MESSAGE);
                e.printStackTrace();
            }
        } else {
            JOptionPane.showMessageDialog(Main.this, "请用户保存需要的文件",
                    "保存文件", JOptionPane.WARNING_MESSAGE);
        }
    }
    public void openDialog() {
        chooser.setCurrentDirectory(new File("."));
        // 文件过滤
        chooser.setFileFilter(new FileFilter() {
            public boolean accept(File f) {
                String fileName = f.getName().toLowerCase();
                return fileName.endsWith(".txt") || f.isDirectory();
            }
            public String getDescription() {
                return "Text Files";
            }
        });
        int openResult = chooser.showOpenDialog(Main.this);
        if (openResult == JFileChooser.APPROVE_OPTION) {
            text.setText("");
            try {
                in = new BufferedReader(new FileReader(chooser
                        .getSelectedFile().getPath()));
                String line;
                while ((line = in.readLine()) != null) {
                    text.append(line);
                    text.append("\n");
                    text.validate();
                }
            } catch (Exception e) {
                JOptionPane.showMessageDialog(Main.this, "文件不能打开",
                        "打开文件", JOptionPane.ERROR_MESSAGE);
                e.printStackTrace();
            }
        } else {
            JOptionPane.showMessageDialog(Main.this, "请用户选择需要打开的文件",
                    "打开文件", JOptionPane.WARNING_MESSAGE);
        }
    } 
class FindDialog extends JDialog implements ActionListener, WindowListener,
        KeyListener {
    final JTextArea text1;
    JLabel lfind, lreplace;
    JTextField tfind, treplace;
    JButton bfind, breplace, bnext, bcancel;
    JPanel fieldPane, buttonPane;
    String strFind, strReplace;
    int txtPlace, txtLen, strNext;
    FindDialog(final JTextArea text, JFrame findDialog) {
        super(findDialog, "查找", true);
        this.text1 = text;
        Container findPane = getContentPane();
        lfind = new JLabel("查找内容");
        lreplace = new JLabel("替换");
        tfind = new JTextField();
        treplace = new JTextField();
        bfind = new JButton("查找");
        breplace = new JButton("替换");
        bcancel = new JButton("取消");
        bnext = new JButton("下一个");
        fieldPane = new JPanel();
        buttonPane = new JPanel();
        fieldPane.setLayout(new GridLayout(2, 2));
        findPane.add(fieldPane, BorderLayout.CENTER);
        findPane.add(buttonPane, BorderLayout.SOUTH);
        fieldPane.add(lfind);
        fieldPane.add(tfind);
        fieldPane.add(lreplace);
        fieldPane.add(treplace);
        buttonPane.add(bfind);
        buttonPane.add(breplace);
        buttonPane.add(bnext);
        buttonPane.add(bcancel);
        bfind.addActionListener(this);
        breplace.addActionListener(this);
        bcancel.addActionListener(this);
        this.addWindowListener(this);
        tfind.addKeyListener(this);
        treplace.addKeyListener(this);
        bnext.addActionListener(this);        
        setSize(370, 120);
        setResizable(false);
    }
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == bfind) {
            find();
        }
        if (e.getSource() == breplace) {
            replace();
        }
        if (e.getSource() == bcancel) {
            setVisible(false);
        }
        if (e.getSource() == bnext) {
            findNext();
        }
    }

    public void windowOpened(WindowEvent e) {
    }

    public void windowClosing(WindowEvent e) {
    }

    public void windowClosed(WindowEvent e) {
    }

    public void windowIconified(WindowEvent e) {
    }

    public void windowDeiconified(WindowEvent e) {
    }

    public void windowActivated(WindowEvent e) {
    }

    public void windowDeactivated(WindowEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyPressed(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {
    }

     private void find() {
        strFind = tfind.getText();
        strNext = 0; //开始位置
        txtPlace = text1.getText().indexOf(strFind, strNext);
        txtLen = txtPlace + strFind.length();
        text1.requestFocus(true);
        text1.select(txtPlace,txtLen);
        strNext = text1.getSelectionEnd(); //选中内容的最后位置
        if (txtPlace == -1) /*没有找到的处理*/ {
            JOptionPane.showMessageDialog(null, "没你找到你需要的内容", "查找",
                    JOptionPane.INFORMATION_MESSAGE);
        }
        bnext.setEnabled(true);
    }

    private void findNext() {
        bfind.setEnabled(false);
        txtPlace = text1.getText().indexOf(strFind, strNext);
        txtLen = txtPlace + strFind.length();
        text1.requestFocus(true);
        text1.select(txtPlace, txtLen);
        strNext = text1.getSelectionEnd(); //获取查找下一个内容的最后位置
        if (txtPlace == -1) /*没有找到的处理*/ {
            JOptionPane.showMessageDialog(null, "没你找到你需要的内容", "查找下一个",
                    JOptionPane.INFORMATION_MESSAGE);
            strNext = 0; //没有找到初始化位置,以变重新查找
            tfind.setText("");
            bnext.setEnabled(false);
            breplace.setEnabled(false);
        }
    }

    private void replace() {
        strReplace = treplace.getText();
        text1.replaceRange(strReplace, txtPlace, txtPlace + strFind.length());
    }
}
class FontDialog extends JDialog implements ActionListener {
    Font font;
    JButton yes= new JButton("确定");
    JButton no = new JButton("退出");
    JLabel fontLabel;
    JLabel colorLabel1;
    JLabel colorLabel10;
    JSpinner spinner;
    JComboBox colorComboBox1,colorComboBox10,fontComboBox;
    JTextArea text;
    FontDialog(JFrame frame,JTextArea text){
    super(frame,true);
    this.text = text;    
    this.setLayout(new GridLayout(1,4));
    yes.addActionListener(this);
    no.addActionListener(this);
    Container container = this.getContentPane();       
    fontLabel = new JLabel("选择字体");
    String[] a = new String[]{"font1","font2","font3","font4"};
    fontComboBox = new JComboBox(a);
    container.add(fontLabel);
    container.add(fontComboBox);   
    colorLabel1 = new JLabel("选择背景颜色");
    colorLabel10 = new JLabel("字体颜色");
    String[] b10 = new String[]{"RED","MAGENTA","GRAY","PINK","WHITE"};
    String[] b1 = new String[]{"BLACK","CYAN","YELLOW","BLUE","PINK"};
    colorComboBox1 = new JComboBox(b1);
    colorComboBox10 = new JComboBox(b10);
    container.add(colorLabel1);
    container.add(colorComboBox10);
    container.add(colorLabel10);
    container.add(colorComboBox1);
    container.add(yes);
    container.add(no);
    this.pack();
    this.setResizable(false);
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == yes){
            Color color;
            int result1 = colorComboBox1.getSelectedIndex();
            int result10 = colorComboBox10.getSelectedIndex();
            switch(result10){
                case 0: color = Color.WHITE;break;
                case 1: color = Color.MAGENTA;break;
                case 2: color = Color.GRAY;break;
                case 3: color = Color.PINK;break;
               default: color = Color.RED;
            }
            text.setBackground(color);
            switch(result1){
                case 0: color = Color.BLACK;break;
                case 1: color = Color.CYAN;break;
                case 2: color = Color.YELLOW;break;
                case 3: color = Color.BLUE;break;
               default: color = Color.PINK;
            }
            text.setForeground(color);           
            int result2 = fontComboBox.getSelectedIndex();
            switch (result2){
                case 0: font = new Font(null,Font.PLAIN,15);break;
                case 1: font = new Font(null,Font.BOLD,15);break;
                case 2: font = new Font(null,Font.ITALIC,15);break;
                case 3: font = new Font(null,Font.CENTER_BASELINE,15);break;
                case 4: font = new Font(null,Font.HANGING_BASELINE,20);
            }
            text.setFont(font);         
        }
        if(e.getSource() == no){
            this.dispose();
        }
    }


    }
class showPanel extends JPanel{
    Image image;
    showPanel(Image image){
        this.image = image;
    }
    public void paintComponent(Graphics g){
        super.paintComponents(g);
        if(image!=null){
            g.drawImage(image,0,0,300,300,this);
        }
        else {
            System.out.println("Wrong!");
        }
    }
}
class EJButton extends JButton{
    EJButton(String str){
        
        Icon icon = new ImageIcon("image" + File.separatorChar + "1.jpg");
        this.setIcon(icon);
        this.setText(str);
        this.setHorizontalTextPosition(SwingConstants.CENTER);
        this.setToolTipText(str);
        this.setSize(20,20);
    }
}
}