java记事本

新知识点

1.撤销

textArea添加一个实现监听接口的类（添加了之后可以一直监视着添加的删除的情况，以便来撤销

        textArea.getDocument().addUndoableEditListener(
                new UndoableEditListener() {
                    public void undoableEditHappened(UndoableEditEvent e) {
                        undoManager.addEdit(e.getEdit());
                        updateButtons();
                    }
                });

再弄一个管理监听的类，可以撤销和恢复

UndoManager undoManager = new UndoManager();

        undoButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    undoManager.undo();
                } catch (CannotRedoException cre) {
                    cre.printStackTrace();
                }
                updateButtons();
            }
        });

        redoButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    undoManager.redo();
                } catch (CannotRedoException cre) {
                    cre.printStackTrace();
                }
                updateButtons();
            }
        });

2删除选中的文本

            int start = text.getSelectionStart();
            int end =text.getSelectionEnd();
            text.replaceRange("", start, end); // 删除被选取的文本。

3设置时间格式

            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
            String s=df.format(new Date());

4激活自动换行

                text.setLineWrap(true);//激活自动换行功能
                text.setWrapStyleWord(true);//激活断行不断字功能(有单词会跳

5设置字体

font.setAccelerator(KeyStroke.getKeyStroke('a'));//点开菜单单键
font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK));//使用组合键
font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0));//全局不用组合键

6打包后文件路径有错

因为打包后文件路径变了，要用URL来获得资源，由于,getClass().getResource是Object类的，可以用this调用

        URL url = this.getClass().getResource("/2.png");
        ImageIcon addIcon = new ImageIcon(url);
        about.setIcon(addIcon);

bug：

1选中文本换颜色不能实现

全部代码

package testWin;

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class FontDialog extends JDialog implements ListSelectionListener,ActionListener {
   FontFamilyNames fontFamilyNames;
   int fontSize=12;
   int fontStyle=0;
   String fontName="宋体";

   JList fontNameList,fontSizeList,fontStyleList;

   Font font;
   JButton yes,cancel;
   static int YES=1,NO=0;
   int state=-1;
   FontDialog(JFrame f) {
      super(f);
      setTitle("字体对话框");
      //font=new Font("宋体",Font.PLAIN,12);
      fontFamilyNames=new FontFamilyNames();
      setModal(true);//当前对话框调用setModal(boolean b)设置为有模式

      //字体列表框：
      String[] name=fontFamilyNames.getFontName();
      fontNameList=new JList();
      fontNameList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      fontNameList.setListData(name);
      fontNameList.setVisibleRowCount(8);
      //设置列表框第一条被选中
      fontNameList.setSelectedIndex(0);
      //添加滚动条
      JScrollPane p1=new JScrollPane(fontNameList);
      fontNameList.addListSelectionListener(this);

      //字形列表框:
      String[] style={"常规                    ","粗体","斜体","粗斜体"};
      fontStyleList=new JList();
      fontStyleList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      fontStyleList.setListData(style);
      fontStyleList.setVisibleRowCount(8);
      fontStyleList.setSelectedIndex(0);
      JScrollPane p2=new JScrollPane(fontStyleList);
      fontStyleList.addListSelectionListener(this);        

      //大小列表框:
      String[] size={"8        ","10","12","14","16","18","20","22","24","26","28","30","32"};
      fontSizeList=new JList();
      fontSizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      fontSizeList.setListData(size);
      fontSizeList.setVisibleRowCount(8);
      fontSizeList.setSelectedIndex(0);
      JScrollPane p3=new JScrollPane(fontSizeList);
      fontSizeList.addListSelectionListener(this); 

      JPanel listPanel=new JPanel();
      listPanel.add(p1);
      listPanel.add(p2);
      listPanel.add(p3);
      add(listPanel,BorderLayout.NORTH);      

      yes=new JButton("确定");
      cancel=new JButton("取消");
      yes.addActionListener(this);
      cancel.addActionListener(this);
      JPanel pSouth=new JPanel();
      pSouth.add(yes);
      pSouth.add(cancel);
      add(pSouth,BorderLayout.SOUTH);   

      setBounds(250,150,400,250);
      setDefaultCloseOperation(DISPOSE_ON_CLOSE);
      validate();
   }
   public void valueChanged(ListSelectionEvent e){
      if(e.getSource()==fontNameList) {
         fontName=(String)fontNameList.getSelectedValue();
      }
      else if(e.getSource()==fontStyleList) {
          fontStyle=fontStyleList.getSelectedIndex();
      }
      else if(e.getSource()==fontSizeList) {
         String s=(String)fontSizeList.getSelectedValue();
         fontSize=Integer.parseInt(s.trim());
     }
      font=new Font(fontName,fontStyle,fontSize);
      validate();
   }
   public void actionPerformed(ActionEvent e) {
      if(e.getSource()==yes) {
          state=YES;
          setVisible(false);       //对话框设置为不可见
      }
      else if(e.getSource()==cancel) {
         state=NO;
         setVisible(false);
      }
   }
   public int getState() {
      return state;
   }
   public Font getFont() {
      return font;
   }
} 

package testWin;

import java.awt.GraphicsEnvironment;
public class FontFamilyNames {
    String allFontNames[];
    public String [] getFontName() {
      GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
      allFontNames=ge.getAvailableFontFamilyNames();
      return allFontNames;
    }
}

package testWin;

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.undo.UndoManager;

public class Polish implements ActionListener{
    JFileChooser file1=new JFileChooser();
    FileNameExtensionFilter filter=new FileNameExtensionFilter("txt文件","txt");//文件名过滤
    private JTextArea text;
    private int huanhang=0;//换行参数
    UndoManager undoManager;
    private JFrame frame;
    void setFrame(JFrame a){
        frame=a;
    }
    void setText(JTextArea a){
        text=a;
    }
    void setUnodManager(UndoManager a){
        undoManager=a;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO 自动生成的方法存根
        if(e.getActionCommand().equals("撤销")){
            undoManager.undo();
        }else if(e.getActionCommand().equals("剪贴")){
            text.cut();
        }else if(e.getActionCommand().equals("复制")){
            text.copy();
        }else if(e.getActionCommand().equals("粘贴")){
            text.paste();
        }else if(e.getActionCommand().equals("删除")){
            int start = text.getSelectionStart();
            int end =text.getSelectionEnd();
            text.replaceRange("", start, end); // 删除被选取的文本。
//            String s=text.getText();   方法2
//            String a=text.getSelectedText();
//            text.setText(s.replace(a,""));
        }else if(e.getActionCommand().equals("全选")){
            text.selectAll();
        }else if(e.getActionCommand().equals("时间/日期")){
            Calendar calendar=Calendar.getInstance();
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
            String s=df.format(new Date());
            text.append(s);
        }else if(e.getActionCommand().equals("自动换行")){
            if(huanhang%2==0){
                text.setLineWrap(true);//激活自动换行功能
                text.setWrapStyleWord(true);//激活断行不断字功能(有单词会跳
            }else{
                text.setLineWrap(false);
                text.setWrapStyleWord(false);
            }
            huanhang++;
        }else if(e.getActionCommand().equals("颜色")){
            Color color2=new Color(120,30,0);
            Color color1=JColorChooser.showDialog(frame,"color",color2);
            text.setForeground(color1);
            text.setSelectedTextColor(color1);
//            JColorChooser   jc=new   JColorChooser();
//            Color color3=jc.showDialog(null,"zb",color2);
//            text.setSelectedTextColor(color3);
        }else if(e.getActionCommand().equals("字体")){
            FontDialog dialog1=new FontDialog(frame);
            dialog1.setVisible(true);
            Font font1=dialog1.getFont();
            text.setFont(font1);
        }else if(e.getActionCommand().equals("关于笔记本")){
            JOptionPane.showMessageDialog(frame, "2015118043,黄煜成,2016/11/17完成");
        }else if(e.getActionCommand().equals("打开")){
            file1.setFileFilter(filter);//过滤下
            int state=file1.showOpenDialog(frame);
            if(state==JFileChooser.APPROVE_OPTION){
                try{
                    File dir=file1.getSelectedFile();
                    FileReader fileReader=new FileReader(dir);
                    BufferedReader in1=new BufferedReader(fileReader);
                    text.setText(null);
                    String s=null;
                    for(;(s=in1.readLine())!=null;){
                        text.append(s+"\n");
                    }
                    in1.close();
                    fileReader.close();
                }
                catch(Exception e1){
                    System.out.println(e1.getMessage());
                }
            }
        }else if(e.getActionCommand().equals("另存为")){
            file1.setFileFilter(filter);//过滤下
            int state=file1.showSaveDialog(frame);//显示出保存框
            if(state==JFileChooser.APPROVE_OPTION){
                try{
                    File dir=file1.getCurrentDirectory();//得到保存路径
                    String name=file1.getSelectedFile().getName();//得到选择的的名字
                    File file=new File(dir,name);
                    FileWriter fileWriter=new FileWriter(file);
                    BufferedWriter out1=new BufferedWriter(fileWriter);
                    out1.write(text.getText());
                    out1.close();
                    fileWriter.close();
                }
                catch(IOException e3){
                    System.out.println(e3.getMessage());
                }
             }
        }
        else if(e.getActionCommand().equals("新建")){
            int n = 0;
            if(text.getText()!="")
                n=JOptionPane.showConfirmDialog(frame, "是否保存");
            if(n==JOptionPane.YES_OPTION){

                file1.setFileFilter(filter);//过滤下
                int state=file1.showSaveDialog(frame);//显示出保存框
                if(state==JFileChooser.APPROVE_OPTION){
                    try{
                        File dir=file1.getCurrentDirectory();//得到保存路径
                        String name=file1.getSelectedFile().getName();//得到选择的的名字
                        File file=new File(dir,name);
                        FileWriter fileWriter=new FileWriter(file);
                        BufferedWriter out1=new BufferedWriter(fileWriter);
                        out1.write(text.getText());
                        out1.close();
                        fileWriter.close();
                    }
                    catch(IOException e3){
                        System.out.println(e3.getMessage());
                    }
                 }
            }
            else if(n==JOptionPane.NO_OPTION){
                text.setText(null);
            }
        }else if(e.getActionCommand().equals("退出")){
            System.exit(0);
        }else if(e.getActionCommand().equals("保存")){
            System.out.println("1111");
            File file1=new File ("新建保存文件.txt");
            if(!file1.exists())
                try {
                    file1.createNewFile();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            try{
                FileWriter fileWriter=new FileWriter(file1);
                BufferedWriter out1=new BufferedWriter(fileWriter);
                out1.write(text.getText());
                out1.close();
                fileWriter.close();
            }
            catch(Exception e5){
                System.out.println(e5.getMessage());
            }
        }
    }
}

package testWin;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Image;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.border.EmptyBorder;
import javax.swing.undo.UndoManager;

public class Text extends JFrame {

    private JPanel contentPane;
    JTextArea textArea = new JTextArea();
    UndoManager undoManager = new UndoManager();
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Text frame = new Text();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Text() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 681, 570);

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        JMenu file = new JMenu("\u6587\u4EF6");
        menuBar.add(file);

        JMenuItem newFile = new JMenuItem("\u65B0\u5EFA");
        newFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));
        file.add(newFile);

        JMenuItem openFile = new JMenuItem("\u6253\u5F00");
        openFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));
        file.add(openFile);

        JMenuItem saveFile = new JMenuItem("\u4FDD\u5B58");
        saveFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
        file.add(saveFile);

        JMenuItem save2File = new JMenuItem("\u53E6\u5B58\u4E3A");
        save2File.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_M, InputEvent.CTRL_MASK));
        file.add(save2File);

        JMenuItem print = new JMenuItem("\u6253\u5370");
        print.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, InputEvent.CTRL_MASK));
        file.add(print);

        JMenuItem close = new JMenuItem("\u9000\u51FA");
        close.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));
        file.add(close);

        JMenu menu = new JMenu("\u7F16\u8F91");
        menuBar.add(menu);

        JMenuItem revoke = new JMenuItem("\u64A4\u9500");
        revoke.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z, InputEvent.CTRL_MASK));
        menu.add(revoke);

        JMenuItem clip = new JMenuItem("\u526A\u8D34");
        clip.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T, InputEvent.CTRL_MASK));
        menu.add(clip);

        JMenuItem copy = new JMenuItem("\u590D\u5236");
        copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK));
        menu.add(copy);

        JMenuItem paste = new JMenuItem("\u7C98\u8D34");
        paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK));
        menu.add(paste);

        JMenuItem delete = new JMenuItem("\u5220\u9664");
        delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, InputEvent.CTRL_MASK));
        menu.add(delete);

        JMenuItem selectAll = new JMenuItem("\u5168\u9009");
        selectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK));
        menu.add(selectAll);

        JMenuItem date = new JMenuItem("\u65F6\u95F4/\u65E5\u671F");
        menu.add(date);

        JMenu format = new JMenu("\u683C\u5F0F");
        menuBar.add(format);

        JMenuItem autoNextLine = new JMenuItem("\u81EA\u52A8\u6362\u884C");
        autoNextLine.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK));
        format.add(autoNextLine);

        JMenuItem font = new JMenuItem("\u5B57\u4F53");
        font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_B, InputEvent.CTRL_MASK));
        format.add(font);

        JMenuItem color = new JMenuItem("\u989C\u8272");
        format.add(color);

        JMenu help = new JMenu("\u5E2E\u52A9");
        menuBar.add(help);

        JMenuItem about = new JMenuItem("\u5173\u4E8E\u7B14\u8BB0\u672C");
        about.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, InputEvent.CTRL_MASK));

        URL url = this.getClass().getResource("/2.png");
        ImageIcon addIcon = new ImageIcon(url);
        about.setIcon(addIcon);

        help.add(about);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JScrollPane scrollPane = new JScrollPane();
        contentPane.add(scrollPane, BorderLayout.CENTER);

        scrollPane.setViewportView(textArea);

        Polish polish1=new Polish();//锟斤拷锟斤拷锟斤拷
        UndoPolish undo=new UndoPolish();//锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷
        textArea.getDocument().addUndoableEditListener(undo);//锟斤拷映锟斤拷锟斤拷锟斤拷锟�

        undo.setUnodManager(undoManager);
        polish1.setText(textArea);
        polish1.setUnodManager(undoManager);//锟斤拷锟捷癸拷锟斤拷锟斤拷
        polish1.setFrame(this);

        revoke.addActionListener(polish1);//锟斤拷蛹锟斤拷锟�
        clip.addActionListener(polish1);
        copy.addActionListener(polish1);
        paste.addActionListener(polish1);
        delete.addActionListener(polish1);
        selectAll.addActionListener(polish1);
        date.addActionListener(polish1);

        autoNextLine.addActionListener(polish1);
        color.addActionListener(polish1);
        font.addActionListener(polish1);

        about.addActionListener(polish1);

        openFile.addActionListener(polish1);
        save2File.addActionListener(polish1);
        newFile.addActionListener(polish1);
        close.addActionListener(polish1);
        saveFile.addActionListener(polish1);
    }
        public ImageIcon getMyImage(String imageName){
              ClassLoader loader = getClass().getClassLoader();
              java.io.InputStream is = loader.getResourceAsStream(imageName);
              Image img;
              ImageIcon ii = null;
              try {
               img = ImageIO.read(is);
               ii = new ImageIcon(img);
               return ii;
              } catch (IOException e) {
               e.printStackTrace();
              }
              return ii;
             }

}

package testWin;

import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.UndoManager;

public class UndoPolish implements UndoableEditListener{
    UndoManager undoManager;
    void setUnodManager(UndoManager a){
        undoManager=a;
    }

    @Override
    public void undoableEditHappened(UndoableEditEvent e) {
        // TODO 自动生成的方法存根
        undoManager.addEdit(e.getEdit());
    }

}