java实战，一个记事本

这是刚学完Java基础的菜鸟，代码很乱，注释不过详细，希望下次能够好一点

package demo2;import java.awt.*;import java.awt.event.*;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.sql.Date;import java.text.SimpleDateFormat;import javax.management.RuntimeErrorException;import javax.swing.BorderFactory;import javax.swing.ButtonModel;import javax.swing.JButton;import javax.swing.JCheckBoxMenuItem;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JList;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.JTextPane;import javax.swing.ListSelectionModel;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;import javax.swing.event.UndoableEditEvent;import javax.swing.event.UndoableEditListener;import javax.swing.undo.CannotUndoException;import javax.swing.undo.UndoManager;import javax.xml.crypto.Data;public class Menu1 extends JFrame{private JFrame f,d;private JMenu m1,bianji,geshi,chakan,bangzhu;//菜单private JMenuBar mb;    //可添加菜单栏private JMenuItem tm1,tm2,tm3,xingjian,yemianshezhi,dayin,shijian,quanxuan,lingcunwei,tihuan;//条目private JMenuItem chexiao,jianqie,fuzhi,zhantie,chazhao,shanchu,ziti,zhuangtailan,chakanbangzhu,guanyujishiben;private JCheckBoxMenuItem zidonghuanhang;private File file;private String jianqieban=null;private Label la;private Button okButton  = new Button("ok");private UndoManager undo;private JScrollPane jsp;private int s;FileDialog op;FileDialog sav;private JTextArea ta; Menu1(){ init(); }public void init(){f=new JFrame("杨氏笔记本");f.setBounds(250, 60, 1068, 590);d = new JFrame("提示");d.setBounds(600,300,180,120);d.setLayout(new FlowLayout());la = new Label(); d.add(la);okButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {d.setVisible(false);}});d.add(okButton);mb=new JMenuBar();bianji = new JMenu("编辑");m1=new JMenu("文件");tm3=new JMenuItem("保存   Ctr+s");tm1=new JMenuItem("退出                  ");tm2=new JMenuItem("打开                  ");geshi = new JMenu("格式 ");lingcunwei =new JMenuItem("另存为");xingjian = new JMenuItem("新建"); yemianshezhi = new JMenuItem("页面设置");dayin = new JMenuItem("打印");shijian = new JMenuItem("时间");quanxuan = new JMenuItem("全选");ziti  = new JMenuItem("字体");tihuan = new JMenuItem("替换");zidonghuanhang = new JCheckBoxMenuItem("自动换行");ta=new JTextArea();jsp =new JScrollPane(ta);op=new FileDialog(f, "我要打开", FileDialog.LOAD);sav=new FileDialog(f, "我要保存", FileDialog.SAVE);m1.add(xingjian);m1.add(tm2);m1.add(tm3);geshi.add(zidonghuanhang);geshi.add(ziti);m1.add(lingcunwei);chexiao = new JMenuItem("撤销   Ctr+z");bianji.add(chexiao);shanchu = new JMenuItem("删除   Ctr+x");bianji.add(shanchu);fuzhi = new JMenuItem("复制   Ctr+c");bianji.add(fuzhi);zhantie = new JMenuItem("粘贴   Ctr+v");bianji.add(zhantie);jianqie = new JMenuItem("剪切");bianji.add(jianqie);chazhao = new JMenuItem("查找");bianji.add(chazhao);bianji.add(tihuan);bianji.add(quanxuan);bianji.add(shijian);chakan = new JMenu("查看");zhuangtailan = new JMenuItem("状态栏");zhuangtailan.setEnabled(false);chakan.add(zhuangtailan);bangzhu = new JMenu("帮助");chakanbangzhu = new JMenuItem("查看帮助");guanyujishiben = new JMenuItem("关于记事本");bangzhu.add(chakanbangzhu);bangzhu.add(guanyujishiben);mb.add(m1);mb.add(bianji);mb.add(geshi);mb.add(chakan);mb.add(bangzhu);m1.add(yemianshezhi);m1.add(dayin);m1.add(tm1); undo = new UndoManager();ta.getDocument().addUndoableEditListener(new UndoableEditListener() {@Overridepublic void undoableEditHappened(UndoableEditEvent e) {// TODO 自动生成的方法存根undo.addEdit(e.getEdit());}});f.setJMenuBar(mb);ta.setFont(new Font("宋体",Font.BOLD,32));f.add(jsp);Event();f.setVisible(true);}public void Event(){//添加替换tihuan.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根replace();}});//添加帮助条中的查看帮助chakanbangzhu.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根JOptionPane.showMessageDialog(null,"尽管玩，玩坏了找小强","提示",JOptionPane.INFORMATION_MESSAGE);  }});guanyujishiben.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根JOptionPane.showMessageDialog(f,   "******************************************************\n"                          +"******************************************************\n"                          +"**                         \n"                          +"** 制作人：杨强                                               \n"                          +"** 特别致谢：网上各大神                                    \n"                          +"** 温馨提示：以上各代码由小强独立打出                   \n"                          +"** 如有雷同纯属巧合                                                       \n"                          +"** 谢谢您的使用                                                               \n"                          +"**               2017.2.28      \n"                          +"******************************************************\n"                          +"******************************************************\n"                          ,"提示",JOptionPane.INFORMATION_MESSAGE);  }});//添加字体事件ziti.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根font();}});//添加查找事件chazhao.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根find();}});//添加撤销事件chexiao.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根//String ss = ta.getSelectedText();           if(undo.canUndo())             {   try                 {              undo.undo();                 }                 catch (CannotUndoException ex)                 {                  System.out.println("Unable to undo:" + ex);                                      }             }            }});//添加删除事件shanchu.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根ta.replaceRange("", ta.getSelectionStart(), ta.getSelectionEnd());}});//添加剪切事件jianqie.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根 jianqieban = ta.getSelectedText(); ta.replaceRange("", ta.getSelectionStart(), ta.getSelectionEnd());}});//添加复制事件fuzhi.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根 jianqieban = ta.getSelectedText();}});//添加粘贴事件zhantie.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根//ta.insert(jianqieban, ta.getCaretPosition()); ta.replaceRange(jianqieban,ta.getSelectionStart(),ta.getSelectionEnd());  }});//添加自动换行事件zidonghuanhang.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根if(zidonghuanhang.getState()){ta.setLineWrap(true);}else{ta.setLineWrap(false);}}});//退出按钮f.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e){String ss; if((ss= ta.getText()).equals("")){System.exit(0);}else{Button baocuo = new Button("保存");Button tuichu = new Button("退出");Button quxiao = new Button("取消");Label laa = new Label("是否保存文件？");Dialog frr = new Dialog(f,"提示");frr.setBounds(600,300,148,108);frr.setLayout(new FlowLayout());frr.add(laa);frr.add(baocuo);frr.add(quxiao);frr.add(tuichu);frr.setVisible(true);frr.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e){frr.setVisible(false);}});quxiao.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根frr.setVisible(false);}});tuichu.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根System.exit(0);}});baocuo.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根if(file==null){sav.setVisible(true); String dirpath=sav.getDirectory(); String filename=sav.getFile(); if(dirpath==null || filename == null)return; file=new File(dirpath,filename);}try{BufferedWriter bufw=new BufferedWriter(new FileWriter(file));String text=ta.getText();bufw.write(text);bufw.flush();bufw.close();}catch(Exception ex){throw new RuntimeException();}// TODO 自动生成的方法存根}});}}});//添加提示框的关闭事件d.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e){d.setVisible(false);}});//添加另存为事件lingcunwei.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根String s ;if(!(s = ta.getText()).equals("")){ sav.setVisible(true); String dirpath=sav.getDirectory(); String filename=sav.getFile(); if(dirpath==null || filename == null)return; file=new File(dirpath,filename); try{BufferedWriter bufw=new BufferedWriter(new FileWriter(file));String text=ta.getText();bufw.write(text);bufw.flush();bufw.close();}catch(Exception ex){throw new RuntimeException();} }else{la.setText("文件为空，别想搞事情");d.setVisible(true);}}});//添加结束程序事件tm1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根System.exit(0);}});//添加编辑中的全选事件quanxuan.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根ta.selectAll();}});//添加文件中的保存文件tm3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if(file==null){sav.setVisible(true); String dirpath=sav.getDirectory(); String filename=sav.getFile(); if(dirpath==null || filename == null)return; file=new File(dirpath,filename);}try{BufferedWriter bufw=new BufferedWriter(new FileWriter(file));String text=ta.getText();bufw.write(text);bufw.flush();bufw.close();}catch(Exception ex){throw new RuntimeException();}// TODO 自动生成的方法存根}});//添加文件条中的打开文件tm2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根op.setVisible(true);String dirpath=op.getDirectory();String filename=op.getFile();//System.out.println(dirpath);if(dirpath==null || filename == null)return;ta.setText(""); file=new File(dirpath,filename);try{BufferedReader bufr=new BufferedReader(new FileReader(file));String line=null;while((line = bufr.readLine())!=null){ta.append(line+"\r\n");}bufr.close();}catch(Exception e1){throw new RuntimeException("读取失败");}}});//添加文件条中的页面设置文件yemianshezhi.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根//Frame fr = new Frame("提示");la.setText("版本太低，你想多了！！");d.setVisible(true);}});//添加文件条中的打印事件dayin.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根la.setText("版本太低，你想多了！！");d.setVisible(true);}});//添加文件条中的新建事件xingjian.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根if(ta.getText().equals("")){la.setText("文本框为空，无法新建");d.setVisible(true);}else{ta.setText("");}}});//添加编辑中的显示时间时间shijian.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {java.util.Date date = new java.util.Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy MM dd  hh:mm:ss");String time = sdf.format(date)+"\r\n";ta.append(time);}});}public void find(){JDialog jfr = new JDialog(f,"查找页面");jfr.setBounds(400,200,410, 180);JButton bu1 = new JButton("查找");JButton bu3 =new JButton("取消");bu3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根jfr.setVisible(false);}});JButton bu2 =  new JButton("查找下一个");JTextField jt = new JTextField(20);JLabel jl = new JLabel("请输入查找数据:");jfr.setLayout(new FlowLayout());jfr.add(jl);jfr.add(jt);jfr.add(bu1);jfr.add(bu2);jfr.add(bu3);bu2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根String str1 = ta.getText();String str2 = jt.getText();if(ta.getSelectedText() == null){ s = str1.indexOf(str2,ta.getCaretPosition()+1);}elses = str1.indexOf(str2, ta.getCaretPosition()-str2.length()+1);if(s>-1){ta.setCaretPosition(s);ta.select(s, s+str2.length());}else                  {   JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);                  }  }});bu1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根String str1 = ta.getText();String str2 = jt.getText();if(ta.getSelectedText() == null){ s = str1.indexOf(str2,ta.getCaretPosition()+1);}elses = str1.indexOf(str2, ta.getCaretPosition()-str2.length()+1);if(s>-1){ta.setCaretPosition(s);ta.select(s, s+str2.length());}else                  {   JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);                  }  }});jfr.setVisible(true);}public void font(){JDialog jdr = new JDialog(f, "字体设置");//定义对话框按照流失布局，向左对齐jdr.setLayout(new FlowLayout(FlowLayout.LEFT));//设置字体，字形（风格），字的大小三个文本条JTextField ziti = new JTextField(17);JTextField zixing = new JTextField(4);JTextField daxiao = new JTextField(5);//字的风格虽然是中文但是计算机值认识（font。……）型，他们代表的都是int型，设置font时只需要将style【i】传进去即可int style[] = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.BOLD+Font.ITALIC};JButton okbu = new JButton("确定");JButton cancel = new JButton("取消");cancel.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根jdr.dispose();}});//找出当前文件格式Font currentfont = ta.getFont();ziti.setText(currentfont.getFontName());ziti.selectAll();//判断字体风格中的int转换成与之对应的string并写到文本条上if(currentfont.getStyle()==Font.PLAIN){zixing.setText("常规");}else if (currentfont.getStyle() == Font.BOLD){zixing.setText("粗体");}else if (currentfont.getStyle() == Font.ITALIC){zixing.setText("斜体");}else if (currentfont.getStyle() == Font.BOLD+Font.ITALIC){zixing.setText("粗斜体");}zixing.selectAll();String strr = String.valueOf(currentfont.getSize()); daxiao.setText(strr);daxiao.selectAll();//定义可选择列表JList  zixinglist,zitilist,daxiaolist; //获得各种字体GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();        String fontName[]=ge.getAvailableFontFamilyNames();            zitilist = new JList(fontName);      zitilist.setSize(70, 20);      zitilist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);//定义一次的索引个数      String zixingstyle[] = {"常规","粗体","斜体","粗斜体"};      zixinglist  = new JList(zixingstyle);      zixinglist.setSize(60, 20);      zixinglist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);//定义一次的索引个数      String fontSize[]={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};        daxiaolist = new JList(fontSize);      daxiaolist.setSize(60, 20);      daxiaolist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);//定义一次的索引个数      JPanel jp1 = new JPanel();      JPanel jp2 = new JPanel();      JPanel jp3 = new JPanel();      jp1.add(ziti);      jp1.add(zixing);      jp1.add(daxiao);       jp1.add(okbu);      jp2.add(new JScrollPane(zitilist));      jp2.add(new JScrollPane(zixinglist));      jp2.add(new JScrollPane(daxiaolist));      jp2.add(cancel);      jdr.add(jp1);      jdr.add(jp2);      JLabel simple = new JLabel("杨氏记事本-HAha");      JPanel simplepane = new JPanel();      simple.setBorder(BorderFactory.createTitledBorder("像我这样"));      simplepane.add(simple);      jdr.add(simplepane);      //初始化选中相应的风格，免得之后如果不点风格就会报错      if(currentfont.getStyle()==Font.PLAIN)             zixinglist.setSelectedIndex(0);         else if(currentfont.getStyle()==Font.BOLD)         zixinglist.setSelectedIndex(1);         else if(currentfont.getStyle()==Font.ITALIC)         zixinglist.setSelectedIndex(2);//获得列表中的位置         else if(currentfont.getStyle()==(Font.BOLD+Font.ITALIC))         zixinglist.setSelectedIndex(3);        zitilist.addListSelectionListener(new ListSelectionListener() {@Overridepublic void valueChanged(ListSelectionEvent e) {// TODO 自动生成的方法存根ziti.setText(fontName[zitilist.getSelectedIndex()]);ziti.selectAll();Font font1 = new Font(ziti.getText(), style[zixinglist.getSelectedIndex()], Integer.parseInt(daxiao.getText()));//font (string,int,int);//字型为int型,计算机不识别粗体这种人类语言simple.setFont(font1);}});      okbu.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根Font font1 = new Font(ziti.getText(), style[zixinglist.getSelectedIndex()], Integer.parseInt(daxiao.getText()));ta.setFont(font1);jdr.dispose();}});      zixinglist.addListSelectionListener(new ListSelectionListener() {@Overridepublic void valueChanged(ListSelectionEvent e) {// TODO 自动生成的方法存根zixing.setText(zixingstyle[zixinglist.getSelectedIndex()]);zixing.selectAll();Font font1 = new Font(ziti.getText(), style[zixinglist.getSelectedIndex()], Integer.parseInt(daxiao.getText()));simple.setFont(font1);}});      daxiaolist.addListSelectionListener(new ListSelectionListener() {@Overridepublic void valueChanged(ListSelectionEvent e) {// TODO 自动生成的方法存根daxiao.setText(fontSize[daxiaolist.getSelectedIndex()]);daxiao.selectAll();Font font1 = new Font(ziti.getText(), style[zixinglist.getSelectedIndex()], Integer.parseInt(daxiao.getText()));simple.setFont(font1);}});     // jdr.add(jp3);      jdr.setBounds(200, 200, 400, 360);     // jdr.setResizable(false);      jdr.setVisible(true);            }//添加替换的方法public void replace(){JDialog jfr = new JDialog(f,"查找页面");jfr.setBounds(400,200,508, 180);JButton bu1 = new JButton("替换");JButton bu4 = new JButton("全部替换");JButton bu5 = new JButton("确定");JButton bu3 =new JButton("取消");bu3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根jfr.setVisible(false);}});JButton bu2 =  new JButton("查找下一个");JTextField jt = new JTextField(20);JTextField  jt2 = new JTextField(20);JLabel jl = new JLabel("请输入要替换数据:");JLabel j2 = new JLabel("请输入替换后数据:");jfr.setLayout(new FlowLayout());jfr.add(jl);jfr.add(jt);jfr.add(bu2);jfr.add(j2);jfr.add(jt2);jfr.add(bu1);jfr.add(bu4);jfr.add(bu5);bu5.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根jfr.dispose();}});jfr.add(bu3);//利用while语句给循环查找与替换话的过程//通过找到和需要查找一样的字符串的index，通过操作index达到替换的效果bu4.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根int flag = 0;String str1 = ta.getText();if(str1.equals("")){return;}String str2 = jt.getText();String str3 = jt2.getText();if(ta.getSelectedText() == null){ s = str1.indexOf(str2,ta.getCaretPosition()+1);}elses = str1.indexOf(str2, ta.getCaretPosition()-str2.length()+1);while(s>-1){if(s>-1){ta.select(s, s+str2.length());ta.replaceRange(str3, ta.getSelectionStart(), ta.getSelectionEnd());flag++;}if(ta.getSelectedText() == null){ s = str1.indexOf(str2,ta.getCaretPosition()+1);}elses = str1.indexOf(str2, ta.getCaretPosition()-str2.length()+1);}if(s<=-1 && flag==0)                {   JOptionPane.showMessageDialog(null,"找不到您替换的内容！","替换",JOptionPane.INFORMATION_MESSAGE);                  }else{JOptionPane.showMessageDialog(null,"替换成功！","替换",JOptionPane.INFORMATION_MESSAGE);  }}});bu2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根String str1 = ta.getText();String str2 = jt.getText();if(ta.getSelectedText() == null){ s = str1.indexOf(str2,ta.getCaretPosition()+1);}elses = str1.indexOf(str2, ta.getCaretPosition()-str2.length()+1);if(s>-1){ta.setCaretPosition(s);ta.select(s, s+str2.length());}else                  {   JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);                  }  }});bu1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO 自动生成的方法存根String str3 = jt2.getText();if(ta.getSelectedText()==null){JOptionPane.showMessageDialog(null,"找不到您要替换的内容！","替换",JOptionPane.INFORMATION_MESSAGE);  }else{ta.replaceRange(str3, ta.getSelectionStart(), ta.getSelectionEnd());JOptionPane.showMessageDialog(null,"替换成功！","替换",JOptionPane.INFORMATION_MESSAGE);  }}});jfr.setVisible(true);}public static void main(String[] args){new Menu1();}} 


                                             
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