mytexteditor.java

简单的文本编辑器,文件操作能够实现：新建文档、保存文档、打开文档、关闭文档、页面设置、打印预览、打印设置、打印等。编辑操作能够实现对文本内容的选择、剪切、复制、粘贴、查找、替换等。

             }            	
       } 
       else
       {
       	fileName = "";     	           
        textBox.setText(""); 
       }      
        
       changed = false;
    }

    //当应用程序被关闭时，exitForm方法被调用
    
    private void exitForm(java.awt.event.WindowEvent evt)
    {         	
    	int n; 	       	
    	Object[] option = { "YES", "NO" };	
    
    	if(changed == true)
    	{        	
            n = JOptionPane.showOptionDialog(null,
                                    "你的文件还没有保存，你想现在保存吗？",
                                    "保存",
                                    JOptionPane.YES_NO_OPTION,
                                    JOptionPane.QUESTION_MESSAGE,
                                    null,
                                    option,
                                    option[0]
                                    );
                                    
            if (n == JOptionPane.YES_OPTION) 
            {
            	
                  doSave(fileName);
                  
                  System.exit(0);
                                      
            } 
            else if (n == JOptionPane.NO_OPTION) 
            {
            	
                  System.exit(0);  
                    
            }                        
        }  
        
    }

    //将文本区域中的内容保存到文件
    
    private void doSave(String fileName)
    {
        
        FileOutputStream fos = null;  
        
        
       
        if(fileName == "")
        {
           doSaveAs();	
        }
        else
        {
           String str = textBox.getText();
        
           try 
           {        	
             fos = new FileOutputStream(fileName);           
             fos.write(str.getBytes());           
           } 
           catch (IOException e) 
           {
           
           } 
           finally 
           {
           try 
           {           	
               fos.close();               
           } 
           catch (IOException e2)
           {
           	
           }           
           }
        }
        changed = false;
    }

    //将当前文件保存为另外一个与原来文件名不同的文件
     
    private void doSaveAs() 
    {
    	FileOutputStream fos = null;    
       
    	String str = textBox.getText(); 
        FileDialog fileDialog = new FileDialog(this, "Save As...", FileDialog.SAVE);                        
        fileDialog.show();
        
        if (fileDialog.getFile() == null)
        {        	
            return;            
        }
        
        fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();
             
         try 
        {        	
           fos = new FileOutputStream(fileName);           
           fos.write(str.getBytes());           
        } 
        catch (IOException e) 
        {
        	        	
        } 
        finally 
        {
           try 
           {           	
               fos.close();               
           } 
           catch (IOException e2)
           {
           	
           }           
         }
        
        
    }
    
    //添加工具条按钮方法，该方法在工具条创建后被调用
    
    protected void toolBaraddButtons(JToolBar toolBar) 
    {
        JButton button = null;      
        
        button = makeNavigationButton("new", NEW,"新建","new"); 
        
        toolBar.add(button); //添加new按钮
        
        button = makeNavigationButton("open", OPEN,"打开","open");
        
        toolBar.add(button);//添加open按钮
        
        button = makeNavigationButton("save", SAVE,"保存","save");
        
        toolBar.add(button);//添加save按钮
        
        button = makeNavigationButton("saveas", SAVE,"另存为","saveas");
        
        toolBar.add(button);//添加saveas按钮   
        
        toolBar.addSeparator();   //添加工具条分隔条
        
        button = makeNavigationButton("copy", COPY,"复制","copy");
        
        toolBar.add(button); //添加copy按钮

        button = makeNavigationButton("paste", PASTE,"粘贴","paste");
        
        toolBar.add(button); //添加paste按钮

        button = makeNavigationButton("cut", CUT,"剪切","cut");
        
        toolBar.add(button);//添加cut按钮
        
        button = makeNavigationButton("search", FIND,"查找","find");
        
        toolBar.add(button);//添加find按钮
        
    }

    //当创建工具条按钮时，makeNavigationButton方法被调用。
    //各参数：imageName 在工具条上要显示的图片的名称
    //        actionCommand 按钮动作的标志
    //        toolTipText 鼠标在按钮上停放时显示的提示文本
    //        altText     当找不到图片路径时，显示的文字
    
    protected JButton makeNavigationButton(String imageName, 
                                           String actionCommand, 
                                           String toolTipText,
                                           String altText) 
    {
        
        String imgLocation = imageName + ".gif"; //按钮图片的称
        
        //定位按钮图片的路径，一般情况下会在相应class文件的目录理查找
        
        URL imageURL = MyTextEditor.class.getResource(imgLocation);

        JButton button = new JButton();    //创建按钮对象    
        
        button.setToolTipText(toolTipText); // 设置提示信息
        
        //根据actionCommand信息，设置按钮的监听器
        
        if(NEW.equals(actionCommand))
        {
        	
             button.addActionListener(new java.awt.event.ActionListener(){
                 public void actionPerformed(java.awt.event.ActionEvent evt){
                      newMenuItemActionPerformed(evt);    }
                 }); 
                      	
        }
        else if(OPEN.equals(actionCommand))
        {
        	
             button.addActionListener(new java.awt.event.ActionListener(){
                 public void actionPerformed(java.awt.event.ActionEvent evt){
                      openMenuItemActionPerformed(evt);    }
                 });   
                 
        }
        else if(SAVE.equals(actionCommand))
        {
        	
             button.addActionListener(new java.awt.event.ActionListener(){
                 public void actionPerformed(java.awt.event.ActionEvent evt){
                      saveMenuItemActionPerformed(evt);    }
                 }); 
                     
        }
        else if(SAVEAS.equals(actionCommand))
        {
        	
             button.addActionListener(new java.awt.event.ActionListener(){
                 public void actionPerformed(java.awt.event.ActionEvent evt){
                      saveAsMenuItemActionPerformed(evt);    }
                 });   
                 
        }
        else if(COPY.equals(actionCommand))
        { 
            button.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent evt){
                     copyMenuItemActionPerformed(evt);    }
                });       
        } 
        else if(PASTE.equals(actionCommand))
        { 
        	
            button.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent evt){
                     pasteMenuItemActionPerformed(evt);    }
                });       
           
        } 
        else if(CUT.equals(actionCommand)) 
        { 
        	
            button.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent evt){
                     cutMenuItemActionPerformed(evt);    }
                }); 
                   
        }
        else if(FIND.equals(actionCommand))
        {
        	
            button.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent evt){
                     findMenuItemActionPerformed(evt);    }
                });   
                    
        }        
        
        //为按钮设置图片
        if (imageURL != null) 
        {    
        	                  
            button.setIcon(new ImageIcon(imageURL));
            
        } 
        else
        {        
        	                           
            button.setText(altText);
            
            System.err.println("Resource not found: "+ imgLocation);
            
        }

        return button;
        
    }   

    // TextEdit类的的成员变量定义
    
    //GUI组件声名开始
    
    private javax.swing.JMenuItem aboutMenuItem;    
    private javax.swing.JMenu editMenu;    
    private javax.swing.JMenuItem exitMenuItem;
    private javax.swing.JMenu fileMenu;    
    private javax.swing.JMenuItem copyMenuItem;    
    private javax.swing.JMenuItem pasteMenuItem;    
    private javax.swing.JMenuItem cutMenuItem;     
    private javax.swing.JMenuItem findMenuItem;     
    private javax.swing.JMenu helpMenu;    
    private javax.swing.JSeparator jSeparator1;    
    private javax.swing.JSeparator jSeparator2;    
    private javax.swing.JSeparator jSeparator3;    
    private javax.swing.JMenuItem newMenuItem;    
    private javax.swing.JMenuItem openMenuItem;
    private javax.swing.JMenuItem saveAsMenuItem;    
    private javax.swing.JMenuItem saveMenuItem;    
    private javax.swing.JMenu setMenu;    
    private javax.swing.JMenuItem FcolorMenuItem;    
    private javax.swing.JMenuItem BcolorMenuItem;    
    
    private javax.swing.JMenuBar tedMenuBar;
    
    private javax.swing.JTextArea textBox;
    
    private javax.swing.JScrollPane textScrollPane;
    
    private javax.swing.JToolBar toolBar;   
    
    //GUI组件声名结束
     
    private String fileName = "";    
    private String COPY = "copy";    
    private String CUT = "cut";       
    private String PASTE = "paste";    
    private String NEW = "new";    
    private String OPEN = "open";    
    private String SAVE = "save";    
    private String SAVEAS = "saveas";
    private String FIND = "find";     
    private boolean changed; 
        
    //应用程序的main函数
    
    public static void main(java.lang.String[] args) 
    {    	
    	  	              
        new MyTextEditor().show();
        
    }//end main  
    
    
      	

    //弹出式菜单（PopupMenu）事件的适配器
    class PopupListener extends MouseAdapter 
    {
       
        PopupListener(JPopupMenu popupMenu)
        {
            popup = popupMenu;
        }

        public void mousePressed(MouseEvent e)
        {
        	
            maybeShowPopup(e);
            
        }

        public void mouseReleased(MouseEvent e)
        {
            maybeShowPopup(e);
            
        }

        private void maybeShowPopup(MouseEvent e)
        {
            if (e.isPopupTrigger()) 
            {
            	
                popup.show(e.getComponent(), e.getX(), e.getY());
                
            }
            
        }
        
         JPopupMenu popup;
        
    }// class PopupListener结束

}//class MyTextEditor结束