notepad.java

编译原理的课程设计

								}
							}
						}
						else if(message == 2)//重新回到编辑窗口
						{
							return;
						}
					}
					try
					{
						fdg.setVisible(true);
						fileDir = fdg.getDirectory();
						fileName = fdg.getFile();
						br = new BufferedReader(new FileReader(new File(fileDir, fileName)));
						jta.setText("");
						while((str = br.readLine()) != null)
						{
							textStrb = textStrb.append(str).append("\n");
						}
						jta.setText(textStrb.toString());
						lastContent = jta.getText();
						br.close();
						Notepad.this.setTitle("CoffeeEditor " + "[" +
										fileDir + fileName + "]");
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(fileOpenItem, 
						ex.toString() + ":\n读取文件出错!", 
						"出错啦!", JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//新建文件菜单项
		newFileItem.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{			
				FileDialog fdgNew = new FileDialog(Notepad.this, "新建", FileDialog.SAVE);
				FileDialog fdg = new FileDialog(Notepad.this, "保存", FileDialog.SAVE);				
				String str = jta.getText();
				BufferedWriter bw = null;
				if(!str.equals(lastContent))
				{
					int message = JOptionPane.showConfirmDialog(newFileItem,
					"是否保存文件?","保存",
					JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
					if(message == 0)
					{
						if((fileName == null) || (fileDir == null))
						{
							fdg.setVisible(true);
							fileDir = fdg.getDirectory();
							fileName = fdg.getFile();
							try
							{
								bw = new BufferedWriter(new FileWriter(new File(fileDir, fileName)));
								bw.write(str);
								bw.close();
							}
							catch(Exception ex)
							{
								JOptionPane.showMessageDialog(newFileItem, 
								ex.toString() + ":\n写入文件出错!", 
								"出错啦!", JOptionPane.INFORMATION_MESSAGE);
							}
						}
						else
						{
							try
							{
								bw = new BufferedWriter(new FileWriter(new File(fileDir, fileName)));
								bw.write(str);
								bw.close();
							}
							catch(Exception ex)
							{
								JOptionPane.showMessageDialog(newFileItem, 
								ex.toString() + ":\n写入文件出错!", 
								"出错啦!", JOptionPane.INFORMATION_MESSAGE);
							}
						}
					}
					else if(message == 2)//重新回到编辑窗口
					{
						return;
					}
				}
				//创建新文件
				fdgNew.setVisible(true);
				fileDir = fdgNew.getDirectory();
				fileName = fdgNew.getFile();
				try
				{
					bw = new BufferedWriter(new FileWriter(new File(fileDir, fileName)));
					jta.setText("");
					bw.close();
					Notepad.this.setTitle("CoffeeEditor " + "[" +
							fileDir + fileName + "]");
				}
				catch(Exception ex)
				{
					JOptionPane.showMessageDialog(newFileItem, 
					ex.toString() + ":\n新建文件出错!", 
					"出错啦!", JOptionPane.INFORMATION_MESSAGE);
				}					
			}
		});		
		fileMenu.add(fileOpenItem);
		fileMenu.add(newFileItem);
		fileMenu.add(saveItem);
		fileMenu.add(fileSaveItem);
		fileMenu.add(systemExitMenuItem);
		menuBar.add(fileMenu);		
		//复制菜单项
		copyItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					jta.copy();
					pasteItem.setEnabled(true);
					popPasteItem.setEnabled(true);
				}
			});
		//粘贴菜单项
		pasteItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					jta.paste();
				}
			});
		//剪切菜单项
		cutItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					jta.cut();
					pasteItem.setEnabled(true);
					popPasteItem.setEnabled(true);
				}
			});
		//删除菜单项
		deleteItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					jta.cut();
					pasteItem.setEnabled(false);
					popPasteItem.setEnabled(false);
				}
			});
		//查找菜单项
		findItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					try
					{
						String tempWord = JOptionPane.showInputDialog(findItem, 
						"要查找的单词:", "查找", JOptionPane.PLAIN_MESSAGE);
						String content = jta.getText();
						int findLength = tempWord.length();
						int conLength = content.length();
						if(findWord.equals(tempWord))
						{
							if((start <= conLength - findLength) && (start >=0))
							{
								start = content.indexOf(findWord, start);
								if(start == -1)
									throw new Exception();
								jta.select(start, start + findLength);
								start = start + findLength;
							}
						}
						else
						{
							start = 0;
							findWord = tempWord;
							start = content.indexOf(findWord, start);
							if(start == -1)
								throw new Exception();
							jta.select(start, start + findLength);
							start = start + findLength;
						}
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(findItem, 
					ex.toString() + ":\n没有找到!", "出错啦!",
					JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//定位菜单项	
		gotoItem.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				try
				{
					int start0 = 0;
					String textTemp = jta.getText();
					int index = Integer.parseInt(JOptionPane.showInputDialog(gotoItem, 
					"定位到行数:", "定位到行", JOptionPane.PLAIN_MESSAGE));
					for(int i = 1; i < index; i++)
					{
						start0 = textTemp.indexOf("\n", start0) + 1;
						if(start0 == 0)
							throw new Exception("行数越界：");
					}
					jta.select(start0, textTemp.indexOf("\n", start0));					
				}
				catch(Exception ex)
				{
					JOptionPane.showMessageDialog(gotoItem, 
					ex.toString() + ":\n输入有误!", "出错啦!",
					JOptionPane.INFORMATION_MESSAGE);
				}
			}
		});
		//全选菜单项
		selectItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					jta.selectAll();
				}
			});
		//单个替换菜单项
		subSingleItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String textTemp = jta.getText();
					int selectStart = jta.getSelectionStart();
					int selectEnd = jta.getSelectionEnd();
					String sourceStr = "";
					String substitudeStr = "";
					try
					{
						if(textTemp.substring(selectStart, selectEnd).equals(""))
						{
							sourceStr = JOptionPane.showInputDialog(subSingleItem, 
							"要替换的文本:", "替换第一个", JOptionPane.PLAIN_MESSAGE);
							substitudeStr = JOptionPane.showInputDialog(subSingleItem, 
							"替换为文本:", "替换为", JOptionPane.PLAIN_MESSAGE);
							textTemp = textTemp.replaceFirst(sourceStr, substitudeStr);
							jta.setText(textTemp);
							int length = substitudeStr.length();
							selectStart = textTemp.indexOf(substitudeStr);
							selectEnd = selectStart + length;
							jta.select(selectStart, selectEnd);						
						}
						else
						{
							sourceStr = textTemp.substring(selectStart, selectEnd);
							substitudeStr = JOptionPane.showInputDialog(subSingleItem, 
							"替换为文本:", "替换为", JOptionPane.PLAIN_MESSAGE);
							textTemp = textTemp.substring(0, selectStart) +
									substitudeStr + textTemp.substring(selectEnd);
							jta.setText(textTemp);
							int length = substitudeStr.length();
							selectEnd = selectStart + length;
							jta.select(selectStart, selectEnd);
						}
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(subSingleItem, 
						ex.toString() + ":\n输入有误!", "出错啦!",
						JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//全部替换菜单项
		subWholeItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String textTemp = jta.getText();
					int selectStart = jta.getSelectionStart();
					int selectEnd = jta.getSelectionEnd();
					String sourceStr = "";
					String substitudeStr = "";
					try
					{
						if(textTemp.substring(selectStart, selectEnd).equals(""))
						{
							sourceStr = JOptionPane.showInputDialog(subSingleItem, 
							"要替换的文本:", "全部替换", JOptionPane.PLAIN_MESSAGE);					
						}
						else
						{
							sourceStr = textTemp.substring(selectStart, selectEnd);
						}
						substitudeStr = JOptionPane.showInputDialog(subSingleItem, 
						"替换为文本:", "替换为", JOptionPane.PLAIN_MESSAGE);
						textTemp = textTemp.replace(sourceStr, substitudeStr);
						jta.setText(textTemp);
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(subWholeItem, 
						ex.toString() + ":\n输入有误!", "出错啦!",
						JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//转换为大写菜单项
		toUpItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String textTemp = jta.getText();
					int selectStart = jta.getSelectionStart();
					int selectEnd = jta.getSelectionEnd();
					String sourceStr = textTemp.substring(selectStart, selectEnd);
					try
					{
						if(sourceStr.equals(""))
						{
							jta.setText(textTemp.toUpperCase());						
						}
						else
						{
							sourceStr = sourceStr.toUpperCase();
							textTemp = textTemp.substring(0, selectStart) +
									sourceStr + textTemp.substring(selectEnd);
							jta.setText(textTemp);
						}
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(toUpItem, 
						ex.toString() + ":\n输入有误!", "出错啦!",
						JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//转换为小写菜单项
		toLowItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String textTemp = jta.getText();
					int selectStart = jta.getSelectionStart();
					int selectEnd = jta.getSelectionEnd();
					String sourceStr = textTemp.substring(selectStart, selectEnd);
					try
					{
						if(sourceStr.equals(""))
						{
							jta.setText(textTemp.toLowerCase());						
						}
						else
						{
							sourceStr = sourceStr.toLowerCase();
							textTemp = textTemp.substring(0, selectStart) +
									sourceStr + textTemp.substring(selectEnd);
							jta.setText(textTemp);
						}
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(toLowItem, 
						ex.toString() + ":\n输入有误!", "出错啦!",
						JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		//大小写转换菜单项
		upLowItem.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String textTemp = jta.getText();
					StringBuffer temp = new StringBuffer();
					int selectStart = jta.getSelectionStart();
					int selectEnd = jta.getSelectionEnd();
					final int LEN = 100;
					int loop = 0;
					int last = 0;
					int length = 0;
					String sourceStr = textTemp.substring(selectStart, selectEnd);
					try
					{
						if(sourceStr.equals(""))
						{
							length = textTemp.length();
							loop = length / LEN;
							last = length % LEN;
							for(int i = 1; i <= loop; i++)
							{
								sourceStr = textTemp.substring((i-1)*LEN, i*LEN);
								sourceStr = Notepad.this.upLowSwitch(sourceStr, LEN);								
								temp = temp.append(sourceStr);
								
							}
							sourceStr = textTemp.substring(loop * LEN);
							sourceStr = Notepad.this.upLowSwitch(sourceStr, last);
							temp = temp.append(sourceStr);
							jta.setText(temp.toString());					
						}
						else
						{
							String sourceTemp = new String(sourceStr);
							length = sourceStr.length();
							loop = length / LEN;
							last = length % LEN;
							for(int i = 1; i <= loop; i++)
							{
								sourceStr = sourceTemp.substring((i-1)*LEN, i*LEN);
								sourceStr = Notepad.this.upLowSwitch(sourceStr, LEN);								
								temp = temp.append(sourceStr);
								
							}
							sourceStr = sourceTemp.substring(loop * LEN);
							sourceStr = Notepad.this.upLowSwitch(sourceStr, last);
							temp = temp.append(sourceStr);
							temp = new StringBuffer(textTemp.substring(0, selectStart)).append(
									temp).append(textTemp.substring(selectEnd));
							jta.setText(temp.toString());
						}
					}
					catch(Exception ex)
					{
						JOptionPane.showMessageDialog(upLowItem, 
						ex.toString() + ":\n输入有误!", "出错啦!",
						JOptionPane.INFORMATION_MESSAGE);
					}
				}
			});
		editMenu.add(copyItem);
		editMenu.add(pasteItem);
		editMenu.add(cutItem);
		editMenu.add(deleteItem);
		changeMenu.add(toLowItem);
		changeMenu.add(toUpItem);
		changeMenu.add(upLowItem);
		editMenu.add(changeMenu);
		editMenu.add(findItem);
		editMenu.add(gotoItem);
		editMenu.add(selectItem);
		subMenu.add(subSingleItem);
		subMenu.add(subWholeItem);
		editMenu.add(subMenu);
		menuBar.add(editMenu);
		//翻译菜单项
		transItem.addActionListener(new ActionListener()