notepad.java

基于java的简单文本编辑器

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.text.*;
import java.io.*;
import javax.swing.undo.UndoManager;



public class NotePad extends JFrame implements ActionListener{
//JTextArea ta =new JTextArea();
JTextArea[] taa =new JTextArea[10];
JToolBar tb=new JToolBar();
JScrollPane[] sp=new JScrollPane[10];
JFileChooser filechooser = new JFileChooser(); //文件选择器
JTabbedPane tabbedPane=new JTabbedPane();
UndoManager[] um=new UndoManager[10];
Document[] doc = new Document[10] ;
        int tabCounter = 0;
	    int index = 0;//正在使用的选项卡或对象等资源的标志

	public NotePad(){
JFrame f=new JFrame("文本编辑器---李锋！");
		f.setLayout(new BorderLayout());
		f.setSize(500,400);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);
        JMenuBar mb=new JMenuBar();
        JMenu m1=new JMenu("文件");
        JMenuItem mi1=new JMenuItem("新建");
         mi1.addActionListener(this);
        JMenuItem mi2=new JMenuItem("打开");
        mi2.addActionListener(this);
        JMenuItem mi3=new JMenuItem("关闭");
        mi3.addActionListener(this);
        JMenuItem mi4=new JMenuItem("保存");
         mi4.addActionListener(this);
        JMenuItem mi5=new JMenuItem("退出");
        mi5.addActionListener(this);
        m1.add(mi1);
        m1.add(mi2);
        m1.add(mi3);
        m1.add(mi4);
        m1.add(mi5);
        mb.add(m1);
        JMenu m2=new JMenu("编辑");
        JMenuItem m21=new JMenuItem("剪切");
        m21.addActionListener(this);
        JMenuItem m22=new JMenuItem("复制");
        m22.addActionListener(this);
        JMenuItem m23=new JMenuItem("粘贴");
        m23.addActionListener(this);
        JMenuItem m24=new JMenuItem("撤销");
        m24.addActionListener(this);
        JMenuItem m25=new JMenuItem("重做");
        m25.addActionListener(this);
        m2.add(m21);
        m2.add(m22);
        m2.add(m23);
        m2.add(m24);
        m2.add(m25);
        mb.add(m2);
        JMenu m4=new JMenu("搜索和替换");
        JMenuItem m41=new JMenuItem("搜索和替换");
        m41.addActionListener(this);
        m4.add(m41);
        mb.add(m4);
        JMenu m3=new JMenu("帮助");
        JMenuItem m31=new JMenuItem("关于");
        m31.addActionListener(this);
        m3.add(m31);
        mb.add(m3);
        JButton b1=new JButton("新建");
        b1.addActionListener(this);
           tb.add(b1);
        JButton b2=new JButton("打开");
        b2.addActionListener(this);
        tb.add(b2);
        JButton b3=new JButton("保存");
        b3.addActionListener(this);
        tb.add(b3);
        JButton b8=new JButton("关闭");
		        b8.addActionListener(this);
        tb.add(b8);
        JButton b4=new JButton("退出");
        b4.addActionListener(this);
        tb.add(b4);
        JButton b5=new JButton("复制");
        b5.addActionListener(this);
        tb.add(b5);
        JButton b6=new JButton("粘贴");
        b6.addActionListener(this);
        tb.add(b6);
        JButton b7=new JButton("剪切");
        b7.addActionListener(this);
        tb.add(b7);
         JButton b9=new JButton("撤销");
		        b9.addActionListener(this);
        tb.add(b9);
         JButton b10=new JButton("重做");
				        b10.addActionListener(this);
        tb.add(b10);
        //JTextArea ta =new JTextArea();
        sp[0]=new JScrollPane();
       taa[0]=new JTextArea();
       um[0]=new UndoManager();
        doc[0]=taa[0].getDocument();
        doc[0].addUndoableEditListener(um[0]);
        sp[0].getViewport().add(taa[0], null);
        tabbedPane.add(sp[0]);

        //tabs1.add(ta);
        //sp.getViewport().add(tabs1, null);
        f.setJMenuBar(mb);
	    f.add(tb,BorderLayout.NORTH);
		//f.add(sp,BorderLayout.CENTER); //增加
		f.add(tabbedPane, BorderLayout.CENTER);
		}

   public void actionPerformed(ActionEvent e){
           String com=e.getActionCommand();
           if(com.equals("退出"))
                           System.exit(0);
           else
               if(com.equals("新建")){
                                     final JPanel content = new JPanel();
									 JLabel tabLabel = new JLabel("Tab " + (++tabCounter));
									 content.setLayout(new GridLayout(1,1));
									 taa[++index]=new JTextArea();
									 doc[index]=taa[index].getDocument();
									 um[index]=new UndoManager();
                                     doc[index].addUndoableEditListener(um[index]);
                                     sp[index]=new JScrollPane();
                                     sp[index].getViewport().add(taa[index], null);
									 content.add(sp[index]);
									 //index++;
									 tabbedPane.addTab(null,content);

				   }
			   else
			        if(com.equals("打开")){

                               int i = filechooser.showOpenDialog(NotePad.this); //显示打开文件对话框
                               if (i == JFileChooser.APPROVE_OPTION){
                                                                                     //点击对话框中打开选项
                                    File f = filechooser.getSelectedFile(); //得到选择的文件
                                    try {
                                           	Reader is = new FileReader(f); //得到文件输入流
                                           tabbedPane.setTitleAt(tabbedPane.getSelectedIndex(),filechooser.getName(f));
                                           taa[tabbedPane.getSelectedIndex()].read(is, "d"); //读入文件到文本窗格
                                           doc[tabbedPane.getSelectedIndex()]=taa[index].getDocument();
										um[tabbedPane.getSelectedIndex()]=new UndoManager();
                                     doc[tabbedPane.getSelectedIndex()].addUndoableEditListener(um[tabbedPane.getSelectedIndex()]);
                                         }
                                   catch (Exception ex) {
                                          ex.printStackTrace();  //输出出错信息
                                                        }
                                                                     }
						}
					else
					     if(com.equals("保存")){

							        int i = filechooser.showSaveDialog(NotePad.this); //显示保存文件对话框
							        if (i == JFileChooser.APPROVE_OPTION) {  //点击对话框中保存按钮
							                     File f = filechooser.getSelectedFile(); //得到选择的文件
							                     try {
							                           FileOutputStream out = new FileOutputStream(f);  //得到文件输出流
							                           out.write(taa[tabbedPane.getSelectedIndex()].getText().getBytes()); //写出文件
							                         }
							                     catch (Exception ex) {
							                               ex.printStackTrace(); //输出出错信息
							                                           }
							                                    }
							 }
						 else
						     if(com.equals("关闭")){

                                                  tabbedPane.remove(tabbedPane.getSelectedIndex());
							     }
							 else
							     if(com.equals("剪切")){
                                        taa[tabbedPane.getSelectedIndex()].cut();  //调用文本窗格的剪切命令

									 }
								 else
									     if(com.equals("复制")){
                                              taa[tabbedPane.getSelectedIndex()].copy();  //调用文本窗格的拷贝命令
											 }
										 else
										     if(com.equals("粘贴")){
                                                  taa[tabbedPane.getSelectedIndex()].paste();  //调用文本窗格的粘贴命令
												 }
											 else
											     if(com.equals("关于")){
                                                       JOptionPane.showMessageDialog(NotePad.this, "文本编辑器---李锋"); //显示软件信息
													 }
												 else
												     if(com.equals("搜索和替换")){
                                                                     String s,s1;
                                                                     int x;
                                                                     s = JOptionPane.showInputDialog("输入需要查找的：");
                                                                     String a = taa[tabbedPane.getSelectedIndex()].getText();
                                                                  if ((x=a.indexOf(s))!=-1){
                                                                     taa[tabbedPane.getSelectedIndex()].setCaretPosition(x);
                                                                     taa[tabbedPane.getSelectedIndex()].setSelectionStart(x);
                                                                     taa[tabbedPane.getSelectedIndex()].setSelectionEnd(x+s.length());
                                                                     s1 = JOptionPane.showInputDialog("输入需要替换的：");
                                                                    taa[tabbedPane.getSelectedIndex()].replaceSelection(s1);
                                                                     }
                                                                  else
                                                                        JOptionPane.showMessageDialog(null, new String("没有找到") + "");
		                                                 }
		                                              else
		                                                  if(com.equals("撤销")){
															  if(um[tabbedPane.getSelectedIndex()].canUndo()){
															       um[tabbedPane.getSelectedIndex()].undo();
															      }
															  }
														 else
													          if(com.equals("重做")){
															  	     if(um[tabbedPane.getSelectedIndex()].canRedo()){
															  		       um[tabbedPane.getSelectedIndex()].redo();
															  			}
															  }
	     }

	public static void main(String args[]){
             new NotePad();
		}
}