javafilter.java

java文件注释过滤器,将文件中的注释过滤掉.

                while (end < content.length() && content.charAt(end) != '\n') {
                    end++;
                }
                content.delete(start, end);
                deleteinfo(content, start);
                return;
            }
            if (content.substring(start, start + 2).equals("/*")) { //end index shoud be exclusive
                while (end < content.length() - 2 &&
                       !content.substring(end, end + 2).equals("*/")) {
                    end++;
                }
                content.delete(start, end + 2);
                deleteinfo(content, start);
                return;
            }
        }
    }

    // New File Action
    class NewAction extends AbstractAction {
        NewAction() {
            super("New");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            newFile();
        }
    }


    public void newFile() {
        if (changed) {
            int ret = JOptionPane.showConfirmDialog(this,
                    "The file have been changed, do you want to save it?",
                    "Confirm", JOptionPane.YES_NO_CANCEL_OPTION);
            switch (ret) {
            case JOptionPane.YES_OPTION:
                saveFile();
                break;
            case JOptionPane.NO_OPTION:
                break;
            case JOptionPane.CANCEL_OPTION:
                return;
            }
        }
        textPane.setText("");
        file = null;
        changed = false;
        setTitle();
    }


    // About Action
    class AboutAction extends AbstractAction {
        AboutAction() {
            super("About");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            JOptionPane.showMessageDialog(curComponet,
                                          "Author: Jesse \nVersion: 1.0 Beta \nDate: July 3th 2006",
                                          "About",
                                          JOptionPane.INFORMATION_MESSAGE);

        }
    }


    // Open File Action
    class OpenAction extends AbstractAction {
        OpenAction() {
            super("Open");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            if (!changed) {
                openFile();
            } else {
                int ret = JOptionPane.showConfirmDialog(curComponet,
                        "Save File?");
                if (ret == JOptionPane.YES_OPTION) {
                    saveFile();
                } else if (ret == JOptionPane.NO_OPTION) {
                    openFile();
                }
            }

        }
    }


    // open the file
    public void openFile() {
        StringBuffer content = new StringBuffer();
        int returnVal = chooser.showOpenDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            file = chooser.getSelectedFile();
            try {
                FileReader in = new FileReader(file);
                int c;
                while ((c = in.read()) != -1) {
                    content.append((char) c);
                }
                in.close();

            } catch (FileNotFoundException fe) {
                JOptionPane.showMessageDialog(curComponet, fe, "File not Found",
                                              JOptionPane.ERROR_MESSAGE);
                return;
            } catch (IOException ie) {
                JOptionPane.showMessageDialog(curComponet, ie,
                                              "File read Error",
                                              JOptionPane.ERROR_MESSAGE);
                return;
            }

            setTitle();
            changed = false;
            textPane.setText(new String(content));
            cur.formatDocument();
            textPane.setCaretPosition(0);
        }
    }

    // Save File Action
    class SaveAction extends AbstractAction {
        SaveAction() {
            super("Save");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            if (changed) {
                saveFile();
            }
        }
    }


    // save the file
    public void saveFile() {
        //a new File
        if (file == null) {
            int returnVal = chooser.showOpenDialog(this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                file = chooser.getSelectedFile();
                if (file.exists()) {
                    int ret = JOptionPane.showConfirmDialog(this,
                            "The file exits, do you want to overwrite it?",
                            "Confirm", JOptionPane.YES_NO_CANCEL_OPTION);
                    switch (ret) {
                    case JOptionPane.YES_OPTION:
                        saveToFile(file);
                        break;
                    case JOptionPane.NO_OPTION:
                        saveFile();
                        return;
                    case JOptionPane.CANCEL_OPTION:
                        return;
                    }

                }
            } else {
                try {
                    file.createNewFile();
                } catch (IOException ie) {
                    JOptionPane.showMessageDialog(curComponet, ie,
                                                  "Can not create a new file.",
                                                  JOptionPane.ERROR_MESSAGE);
                }
                saveToFile(file);
            }
        } else {
            saveToFile(file);
        }
    }

    // save to the file
    public void saveToFile(File file) {
        try {
            FileWriter out = new FileWriter(file);
            out.write(textPane.getText());
            out.close();

        } catch (IOException ie) {
            JOptionPane.showMessageDialog(curComponet, ie, "File write Error",
                                          JOptionPane.ERROR_MESSAGE);
            return;
        }
        changed = false;
        setTitle();

    }

    // Save File As Action
    class SaveAsAction extends AbstractAction {
        SaveAsAction() {
            super("Save As...");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            saveAsFile();
        }
    }


    public void saveAsFile() {
        int returnVal = chooser.showOpenDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            file = chooser.getSelectedFile();

            if (file.exists()) {
                int ret = JOptionPane.showConfirmDialog(curComponet,
                        "The file exits, do you want to overwrite it?",
                        "Confirm", JOptionPane.YES_NO_CANCEL_OPTION);
                switch (ret) {
                case JOptionPane.YES_OPTION:
                    saveToFile(file);
                    break;
                case JOptionPane.NO_OPTION:
                    saveAsFile();
                    break;
                case JOptionPane.CANCEL_OPTION:
                    return;
                }

            } else {
                try {
                    file.createNewFile();
                } catch (IOException ie) {
                    JOptionPane.showMessageDialog(curComponet, ie,
                                                  "Can not create a new file.",
                                                  JOptionPane.ERROR_MESSAGE);
                }
                saveToFile(file);
            }
        }
    }

    // Exit File Action
    class ExitAction extends AbstractAction {
        ExitAction() {
            super("Exit");
            setEnabled(true);
        }

        public void actionPerformed(ActionEvent e) {
            if (changed) {
                int ret = JOptionPane.showConfirmDialog(null, "Save File?",
                        "Confirm", JOptionPane.YES_NO_OPTION);
                if (ret == JOptionPane.YES_OPTION) {
                    saveFile();
                    System.exit(0);
                } else if (ret == JOptionPane.NO_OPTION) {
                    System.exit(0);
                }
            }
            System.exit(0);
        }
    }


    // Undo Action
    class UndoAction extends AbstractAction {
        public UndoAction() {
            super("Undo");
            setEnabled(false);
        }

        public void actionPerformed(ActionEvent e) {
            try {
                undo.undo();
            } catch (CannotUndoException ex) {
                System.out.println("Unable to undo: " + ex);
                ex.printStackTrace();
            }
            updateUndoState();
            redoAction.updateRedoState();
        }

        protected void updateUndoState() {
            if (undo.canUndo()) {
                setEnabled(true);
                putValue(Action.NAME, undo.getUndoPresentationName());
            } else {
                setEnabled(false);
                putValue(Action.NAME, "Undo");
            }
        }
    }


    class RedoAction extends AbstractAction {
        public RedoAction() {
            super("Redo");
            setEnabled(false);
        }

        public void actionPerformed(ActionEvent e) {
            try {
                undo.redo();
            } catch (CannotRedoException ex) {
                System.out.println("Unable to redo: " + ex);
                ex.printStackTrace();
            }
            updateRedoState();
            undoAction.updateUndoState();
        }

        protected void updateRedoState() {
            if (undo.canRedo()) {
                setEnabled(true);
                putValue(Action.NAME, undo.getRedoPresentationName());
            } else {
                setEnabled(false);
                putValue(Action.NAME, "Redo");
            }
        }
    }


    //The standard main method.
    public static void main(String[] args) {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
        //Create and set up the window.
        javaFilter frame = new javaFilter();
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
}