JAVA GUI牛刀小试——记事本

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.regex.*;;

public class Notepad{
    static String mystrFile = null;

    public static void main(String[] args)throws Exception{

        final MyFrame mf = new MyFrame("Notepad");
        //打开文件侦听对象的实现
        ActionListener al1 = new ActionListener()
        {
            public void actionPerformed(ActionEvent e){
                FileDialog fd = new FileDialog(mf, "Open", FileDialog.LOAD);
                fd.setVisible(true);
                String strFile = fd.getDirectory()+fd.getFile();
                if(strFile != null){
                    try{
                        FileInputStream fis = new FileInputStream(strFile);
                        byte[] buf = new byte[10*1024];
                        int len = fis.read(buf);
                        mf.ta.append(new String(buf,0,len));
                        strFile = null;
                        fis.close();
                        }
                    catch(Exception ex){
                        ex.printStackTrace();
                    }

                }
            }
        };
        mf.mi2.addActionListener(al1);//注册打开文件的侦听

        //另存为文件侦听的实现
        ActionListener al2 = new ActionListener()
        {
            public void actionPerformed(ActionEvent e){
                FileDialog fd = new FileDialog(mf, "Save", FileDialog.SAVE);
                fd.setVisible(true);
                String strFile = fd.getDirectory()+ fd.getFile();
                if(strFile != null){
                    try{
                        FileOutputStream fos = new FileOutputStream(strFile);
                        fos.write(mf.ta.getText().getBytes(), 0, mf.ta.getText().length());
                        mystrFile = strFile;
                        strFile = null;
                        fos.close();
                    }
                    catch(Exception ex){
                        ex.printStackTrace();
                    }
                }
            }
        };
        mf.mi4.addActionListener(al2);//注册另存为侦听

        //保存侦听的实现
        ActionListener al3 = new ActionListener()
        {
            public void actionPerformed(ActionEvent e){
                if(mystrFile == null){
                    FileDialog fd = new FileDialog(mf, "Save", FileDialog.SAVE);
                    fd.setVisible(true);
                    String strFile = fd.getDirectory()+ fd.getFile();
                    if(strFile != null){
                        try{
                            FileOutputStream fos = new FileOutputStream(strFile);
                            fos.write(mf.ta.getText().getBytes(), 0, mf.ta.getText().length());
                            fos.close();
                        }
                        catch(Exception ex){
                            ex.printStackTrace();
                        }
                    }
                    mystrFile = strFile;
                    strFile = null;
                }
                else
                {
                    try{
                        FileOutputStream fos = new FileOutputStream(mystrFile);
                        fos.write(mf.ta.getText().getBytes(), 0, mf.ta.getText().length());
                        fos.close();
                    }
                    catch(Exception ex){
                        ex.printStackTrace();
                    }

                }
            }
        };

        mf.mi3.addActionListener(al3);//注册保存侦听

        mf.setVisible(true);
    }
}

/*此类继承自Frame*/
class MyFrame extends Frame{
    static String s = null;//当剪切板用
    MenuBar mb;  //定义窗口的MenuBar类
    Menu m1, m2, m3, m4, m5;  //定义MenuBar的Menu
    MenuItem mi1, mi2, mi3, mi4, mi5;//定义Menu的MenuItem
    MenuItem mi6, mi7;
    MenuItem mi8, mi9, mi10, mi11, mi12;
    MenuItem mi13;
    MenuItem mi14, mi15, mi17;
    final TextArea ta = new TextArea();//构造文本域
    MyFrame(String name){
        super(name);
        setLocation(350,120);//初始位置
        setSize(600,610);//初始大小
        setMyMenuBar();
        setMenuBar(mb);
        //叉号退出
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }}
        );
        add(ta);//添加文本域
        }
    public void setMyMenuBar(){
        mb = new MenuBar();
        setMyMenu();
        mb.add(m1);
        mb.add(m2);
        mb.add(m3);
        mb.add(m4);
        mb.add(m5);
    }
    /*此类定义了Menu，并且调用了setMyMenuItem*/
    public void setMyMenu(){
        m1 = new Menu("文件");
        m2 = new Menu("编辑");
        m3 = new Menu("格式");
        m4 = new Menu("查看");
        m5 = new Menu("帮助");
        setMyMenuItem();
        m1.add(mi1);
        m1.add(mi2);
        m1.add(mi3);
        m1.add(mi4);
        m1.add(mi5);
        m5.add(mi6);
        m5.add(mi7);
        m2.add(mi8);
        m2.add(mi9);
        m2.add(mi10);
        m2.add(mi11);
        m2.add(mi12);
        m3.add(mi13);
        m4.add(mi14);
        m4.add(mi15);
        m5.add(mi17);

    }
    /*此函数中构造了MenuItem，并且实现了部分MenuItem的侦听*/
    public void setMyMenuItem(){
        mi1 = new MenuItem("新建");
        mi1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                ta.setText("");
            }
        });
        mi2 = new MenuItem("打开");
    /*  ActionListener al = new ActionListener(){
            public void actionPerformed(ActionEvent e){
                FileDialog fd = new FileDialog(this, "打开", FileDialog.LOAD);
            }
        };*/

        /*一下连个MenuItem的侦听器实现在Notepad类中，因为内部类只能访问final和static变量，在Notepad中定义了final mf*/
        mi3 = new MenuItem("保存");
        mi4 = new MenuItem("另存为");

        mi5 = new MenuItem("退出");/*定义退出按钮*/
        /*内部类实现“退出”MenuItem的侦听器并注册*/
        mi5.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                System.exit(1);
            }
        });
        mi6 = new MenuItem("查看帮助");
        mi6.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "Fighting2011!!!",
                        "Notepad", JOptionPane.INFORMATION_MESSAGE);


            }
        });
        mi7 = new MenuItem("关于记事本");
        /*实现mi7  MenuItem的侦听器并注册*/
        mi7.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "大成的写字板/nhttp://student.csdn.net/?297196",
                        "Notepad", JOptionPane.INFORMATION_MESSAGE);
            }
        });
        mi8 = new MenuItem("剪切");
        mi8.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                s = ta.getSelectedText();
                int start = ta.getSelectionStart();
                int end = ta.getSelectionEnd();
                ta.replaceText("", start, end);
            }
        });

        mi9 = new MenuItem("复制");//这里我用了静态变量，最好改为剪贴板O__O"…
        mi9.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                s = ta.getSelectedText();
            }
        });
        mi10 = new MenuItem("粘贴");//此处应该改为剪贴板O__O"…
        /*实现粘贴按钮侦听器的接口*/
        mi10.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                ta.append(s);
            }
        });
        mi11 = new MenuItem("删除");
        mi11.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                int start = ta.getSelectionStart();
                int end = ta.getSelectionEnd();
                ta.replaceText("", start, end);
            }
        });

        mi12 = new MenuItem("时间/日期");//调用时间函数
        /*实现时间按钮按钮侦听器的接口*/
        mi12.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                  java.util.Date utildate=new java.util.Date();
                  ta.append(""+utildate);
            }
        });
        mi13 = new MenuItem("字体");
        mi14 = new MenuItem("当前字数");
        mi15 = new MenuItem("当前行数");

        mi15.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                String   input = ta.getText();
                String[]   regStr   = input.split( "/n") ;

                int   i   =  0;
                for(String s : regStr){i++;}

                JOptionPane.showMessageDialog(null, "当前行数："+ i,
                        "", JOptionPane.INFORMATION_MESSAGE);
            }
        });

        mi17 = new MenuItem("作者的主页");
        mi17.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                 String command = "explorer http://student.csdn.net/?297196";
                  try {
                //这里是打开一个指定的网址
                   Process process  = Runtime.getRuntime().exec(command);
                  } catch (IOException ex) {
                   // TODO 自动生成 catch 块
                   ex.printStackTrace();
                  }
            }
        });

    }
}