texteditor.java

这是我编的一个文本编辑器

				ignoreCase=true;
			}
		}		    
	}
		 
	
	//打开文件
	private void open()
	{
		if(okToAbandon())
		{
			save();
		}
		jFileChooser.setDialogTitle("打开");
		if(jFileChooser.showOpenDialog(this)==JFileChooser.APPROVE_OPTION)
		{
    		try
    		{
    			BufferedInputStream in=new BufferedInputStream(new FileInputStream(jFileChooser.getSelectedFile()));
    			byte[] b=new byte[in.available()];
    			in.read(b,0,b.length);
    			text.setText(new String(b,0,b.length));
    			in.close();
	    		setTitle("文本编辑器---"+jFileChooser.getSelectedFile().getName());
	    		textContent=text.getText();
			
    		}
    		catch(IOException ex)
	    	{
	    		JOptionPane.showMessageDialog(this,"无法打开文件","打开文件",JOptionPane.INFORMATION_MESSAGE);
	    	}
		}
	}
	

	//保存文件
	private void save()
	{
		jFileChooser.setDialogTitle("保存");
		if(jFileChooser.showSaveDialog(this)==JFileChooser.APPROVE_OPTION)
		{
        	try
	    	{
	    		BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(jFileChooser.getSelectedFile()));
	    		byte[] b=(text.getText().getBytes());
	    		out.write(b,0,b.length);
	    		out.close();
	    		textContent=text.getText();
	    		JOptionPane.showMessageDialog(this,"保存文件成功！","保存文件",JOptionPane.INFORMATION_MESSAGE);
	    	}
	    	catch(IOException ex)
	    	{
	    		JOptionPane.showMessageDialog(this,"无法保存文件","保存文件",JOptionPane.INFORMATION_MESSAGE);
	    	}
		}
	}
	
	//新建文件
	private  void newDocument()
	{
		if(okToAbandon())
		{
			save();
		}
		text.setText("");
		textContent=text.getText();	
		setTitle("文本编辑器---未命名");	
	}
	
	//用来查看是否文档改变了
	private boolean textIsChange()
	{
		String current=text.getText();
		if(!current.equals(textContent))
		{
			return true;
		}
		return false;
	}
	
	//用来询问用户，如果文档改变了，该怎么处理
    public 	boolean okToAbandon() 
    {
    	boolean i=false;
    	if(textIsChange())
    	{
    		int value =  JOptionPane.showConfirmDialog(this, "文件已经改变了，是否保存？",
                                    "文件改变", JOptionPane.YES_NO_OPTION);
            switch (value)
            {
               case JOptionPane.YES_OPTION:i=true;break;
               case JOptionPane.NO_OPTION:i=false;break;
            }	
    	}
        return i;
    }


	
	//查找
	private void find(String string)
	{
		int length=text.getText().length();
		boolean isNotFind=true;
		if(findNext)       //向下查找
		{
			if(index==-1 && string.length()==1)
	     	{
	        	index=1;
	   		}
			else if(length<string.length()||(index+string.length()>length))
    		{
    			findExit();
    		}
    		else if(ignoreCase==true)
     		{
     			for(index=index;isNotFind==true;index++)
    			{
    				if(index+string.length()>length)
    				{
    					findExit();
    				}
    				else if(text.getText().substring(index,index+string.length()).equals(string))
    				{
     					text.select(index,index+string.length());
	    				isNotFind=false;
	    				isFind=true;	
	    			}
	     		}	
    		}
    		else 
    		{
    			for(index=index;isNotFind==true;index++)
    			{
    				if(index+string.length()>length)
    				{
    					findExit();
    				}
	    			else if(text.getText().substring(index,index+string.length()).equalsIgnoreCase(string))
	    			{
	    				text.select(index,index+string.length());
	    				isNotFind=false;
	    				isFind=true;
	    			}
	    		}		
    		}
		}
		if(!findNext)   //向上查找
		{
			if(index==length && string.length()==1)
	     	{
		    	index=length-2;
	 		}
			else if(length<string.length()|| (index-string.length()+1<0))
    		{
    			findExit();
    		}
    		if(ignoreCase==true)
     		{
    			for(index=index;isNotFind==true;index--)
    			{
    				if(index-string.length()+1<0)
    				{
    					findExit();
    					break;
    				}
    				else if(text.getText().substring(index-string.length()+1,index+1).equals(string))
    				{
     					text.select(index-string.length()+1,index+1);
	    				isNotFind=false;
	    				isFind=true;	
	    			}
	     		}
    		}
    		else 
     		{
    			for(index=index;isNotFind==true;index--)
    			{
    				if(index-string.length()+1<0)
    				{
    					findExit();
    					break;
    				}
    				else if(text.getText().substring(index-string.length()+1,index+1).equalsIgnoreCase(string))
    				{
     					text.select(index-string.length()+1,index+1);
	    				isNotFind=false;
	    				isFind=true;	
	    			}
	     		}
    		}
		}
	}
	
	//结束查询或终止查询
	private void findExit()
	{
		searchJFrame.setVisible(false);
		text.setText(text.getText());
		index=0;
		JOptionPane.showMessageDialog(this,"查找结素","查找与替换",JOptionPane.INFORMATION_MESSAGE);
	}
	
	//替换程序，其中要用到查找程序，先查找再决定替换
	public void replace()
	{
	   text.replaceRange(replaceText.getText(),index-1,index+findText.getText().length()-1);
	   isFind=false;
	}
	public void replaceAll()
	{
		while(index+findText.getText().length()<=text.getText().length())
		{
			findNext=true;
			find(findText.getText());
			replace();
			isFind=false;
		}
	}
	
	 	
	//查错功能
	public void check() 
	{
		text.setHighlighter(hl);
		String string=text.getText();
		Pattern p=Pattern.compile("[a-zA-Z]+");
		Matcher m = p.matcher(string);
		while(m.find())
		{
			int start=m.start();
			int end=m.end();
			if(!isFind(string.substring(start,end),0,13791))
			{
				try
				{
					hl.addHighlight(start,end,hp);
				}
				catch(Exception e){}				
			}
		}
	}
	
	//看是否在字典中
	private boolean isFind(String s,int m,int n)
	{
		int left=m;
		int right=n;
		int centre=(left+right)/2;
		String string=s.toLowerCase();
		if(right-left<=1)
		{
			if(dic[left].equalsIgnoreCase(string)||dic[right].equalsIgnoreCase(string))
			{
				return true;
			}
			return false;
		}
		else if(dic[centre].equalsIgnoreCase(string)){return true;}
		else if(dic[centre].compareTo(string)<0){return isFind(string,centre,right);}
        else return isFind(string,left,centre);
   

	}
	
	//给出纠错建议 
    private void showOpinion()
	{
		JMenuItem[] jmenu=new JMenuItem[6];
		menu.removeAll();
		int k=0;
		final int start=text.getSelectionStart();
		final int end=text.getSelectionEnd();
		String s=text.getText().substring(start,end);
		int len=s.length();
	   	for(int i=1;i<len-1&&k<6;i++)
	   	{
	   		for(char c='a';c>='a'&&c<='z'&k<6;c++)
	    	{
	    		String str=s.substring(0,len-i)+new String(new char[]{c})+s.substring(len-i,len);
		    	if(isFind(str,0,13791))
	       		{
	       			jmenu[k]=new JMenuItem(str);
	       			k++;
	       		}
	    	}
    		for(char c='a';c>='a'&&c<='z'&&i<=len/2+1&k<6;c++)
       		{
	   			String str=s.substring(0,len-i+1)+new String(new char[]{c});
	       		if(isFind(str,0,13791))
	       		{
	       			jmenu[k]=new JMenuItem(str);
        			k++;	    	    	
        		}
	    	}	
	    }
	    for(char c='a';c>='a'&&c<='z'&&k<6;c++)
       	{
	   		String str=s.substring(0,len-1)+new String(new char[]{c});
	   		if(isFind(str,0,13791))
	   		{
	       		jmenu[k]=new JMenuItem(str);
        		k++;	    	    	
       		}
	   	}	
	   	ActionListener al = new ActionListener() 
	   	{
	    		
              public void actionPerformed(ActionEvent e) {
              text.replaceRange(((JMenuItem)e.getSource()).getText(),start,end);} 
   	    };
   	    if(jmenu[1]==null)
   	    {
   	    	jmenu[1]=new JMenuItem("没找到!");
   	    	menu.add(jmenu[1]);
   	    }
   	    for(int i=0;i<=k-1;i++)
   	    {
        	jmenu[i].addActionListener(al);
   	    	menu.add(jmenu[i]);
   	    }
   	}
}