notepad.java

一个记事本程序

					isTitled = false;
					fileName = "无标题";
					setTitle(fileName + "-记事本");
				}
			}
			// 新建的文件
			else if (!isTitled) {
				String strTemp = note.getText();
				// 如果工作区中有文字，工作区不为空
				if (strTemp.length() != 0) {
					int isExit = JOptionPane.showConfirmDialog(null, "文件 "
							+ fileName + " 的文字已经改变，想保存文件吗 ?", "记事本",
							JOptionPane.YES_NO_CANCEL_OPTION);
					if (isExit == JOptionPane.YES_OPTION) {
						if (isTitled == false) {// 非打开的文件，没有文件名
							int result = fileChooser.showSaveDialog(null);
							if (result == JFileChooser.APPROVE_OPTION) {
								File file = fileChooser.getSelectedFile();
								writeFile(file);
								note.setText("");
								isTitled = false;
								fileName = "无标题";
								filePath = null;
								setTitle(fileName + "-记事本");
							}
						} else {// 打开的文件，文件名存在
							File file = new File(filePath);
							writeFile(file);
						}
					} else if (isExit == JOptionPane.NO_OPTION) {
						note.setText("");
						isTitled = false;
						fileName = "无标题";
						setTitle(fileName + "-记事本");
					} else
						return;
				}
				// 工作区为空，直接新建
				else {
					note.setText("");
					isTitled = false;
					fileName = "无标题";
					setTitle(fileName + "-记事本");
				}
			}
		}
		/** ******打开文件********OK */
		else if (e.getSource() == open) {
			// 打开的文件
			if (isTitled) {
				int newHashCode = 0;
				String fileContent = note.getText();
				newHashCode = fileContent.hashCode();
				// 如果文件内容被修改了，打开文件之前询问是否保存文件
				if (hashCode != newHashCode) {
					int isExit = JOptionPane.showConfirmDialog(null, "文件 "
							+ filePath + " 的文字已经改变，想保存文件吗 ?", "记事本",
							JOptionPane.YES_NO_CANCEL_OPTION);
					if (isExit == JOptionPane.YES_OPTION) {
						// save option
						File fileToSave = new File(filePath);
						writeFile(fileToSave);
						// open option
						fileChooser
								.setFileSelectionMode(JFileChooser.FILES_ONLY);
						int result = fileChooser.showOpenDialog(null);
						if (result == JFileChooser.APPROVE_OPTION) {
							File file = fileChooser.getSelectedFile();
							fileName = file.getName();
							filePath = file.getAbsolutePath();
							String title = fileName + "-记事本";
							setTitle(title);
							isTitled = true;
							readFile(file);
							str1 = note.getText();
						}
					} else if (isExit == JOptionPane.NO_OPTION) {
						fileChooser
								.setFileSelectionMode(JFileChooser.FILES_ONLY);
						int result = fileChooser.showOpenDialog(null);
						if (result == JFileChooser.APPROVE_OPTION) {
							File file = fileChooser.getSelectedFile();
							fileName = file.getName();
							filePath = file.getAbsolutePath();
							String title = fileName + "-记事本";
							setTitle(title);
							isTitled = true;
							readFile(file);
							str1 = note.getText();
						}
					} else
						return;
				}
				// 打开的文件，而且文件内容没有被修改，直接打开
				else {
					fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
					int result = fileChooser.showOpenDialog(null);
					if (result == JFileChooser.APPROVE_OPTION) {
						File file = fileChooser.getSelectedFile();
						fileName = file.getName();
						filePath = file.getAbsolutePath();
						String title = fileName + "-记事本";
						setTitle(title);
						isTitled = true;
						readFile(file);
						str1 = note.getText();
					}
				}
			}
			// 新建的文件
			else if (!isTitled) {
				String strTemp = note.getText();
				// 如果工作区中有文字，工作区不为空，打开文件时询问是否保存文件
				if (strTemp.length() != 0) {
					int isExit = JOptionPane.showConfirmDialog(null, "文件 "
							+ fileName + " 的文字已经改变，想保存文件吗 ?", "记事本",
							JOptionPane.YES_NO_CANCEL_OPTION);
					if (isExit == JOptionPane.YES_OPTION) {

						int result = fileChooser.showSaveDialog(null);
						if (result == JFileChooser.APPROVE_OPTION) {
							// save option
							File fileToSave = fileChooser.getSelectedFile();
							writeFile(fileToSave);
							// open option
							fileChooser
									.setFileSelectionMode(JFileChooser.FILES_ONLY);
							int result1 = fileChooser.showOpenDialog(null);
							if (result1 == JFileChooser.APPROVE_OPTION) {
								File file = fileChooser.getSelectedFile();
								fileName = file.getName();
								filePath = file.getAbsolutePath();
								String title = fileName + "-记事本";
								setTitle(title);
								isTitled = true;
								readFile(file);
								str1 = note.getText();
							}
						}

					} else if (isExit == JOptionPane.NO_OPTION) {
						fileChooser
								.setFileSelectionMode(JFileChooser.FILES_ONLY);
						int result = fileChooser.showOpenDialog(null);
						if (result == JFileChooser.APPROVE_OPTION) {
							File file = fileChooser.getSelectedFile();
							fileName = file.getName();
							filePath = file.getAbsolutePath();
							String title = fileName + "-记事本";
							setTitle(title);
							isTitled = true;
							readFile(file);
							str1 = note.getText();
						}
					} else
						return;
				}
				// 工作区为空，直接打开
				else {
					fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
					int result = fileChooser.showOpenDialog(null);
					if (result == JFileChooser.APPROVE_OPTION) {
						File file = fileChooser.getSelectedFile();
						fileName = file.getName();
						filePath = file.getAbsolutePath();
						String title = fileName + "-记事本";
						setTitle(title);
						isTitled = true;
						readFile(file);
						str1 = note.getText();
					}
				}
			}
		}
		/** ******保存文件*********OK */
		else if (e.getSource() == save) {
			if (!isTitled) {// 非打开的文件，文件名为空
				int result = fileChooser.showSaveDialog(null);
				if (result == JFileChooser.APPROVE_OPTION) {
					File file = fileChooser.getSelectedFile();
					fileName = file.getName();
					filePath = file.getAbsolutePath();
					isTitled = true;
					writeFile(file);
					setTitle(fileName + "-记事本");
				}
			} else {// 打开的文件
				File file = new File(filePath);
				writeFile(file);
			}
		}
		/** *******文件另存为**********OK* */
		else if (e.getSource() == reSave) {
			int result = fileChooser.showSaveDialog(null);
			if (result == JFileChooser.APPROVE_OPTION) {
				File file = fileChooser.getSelectedFile();
				fileName = file.getName();
				filePath = file.getAbsolutePath();
				isTitled = true;
				writeFile(file);
				setTitle(fileName + "-记事本");
			}
		}
		/** *****复制操作*****OK */
		else if (e.getSource() == copy || e.getSource() == popCopy) {
			// 将选中的文本保存在剪切板上
			String text = note.getSelectedText();
			StringSelection selection = new StringSelection(text);
			clipboard.setContents(selection, null);

		}
		/** *****剪切操作*****OK */
		else if (e.getSource() == cut || e.getSource() == popCut) {
			String text = note.getSelectedText();
			StringSelection selection = new StringSelection(text);
			clipboard.setContents(selection, null);
			note.replaceRange("", note.getSelectionStart(), note
					.getSelectionEnd());
		}
		/** *****粘贴操作*****OK */
		else if (e.getSource() == paste || e.getSource() == popPaste) {
			Transferable contents = clipboard.getContents(this);
			if (contents == null)
				return;
			String text = "";
			try {
				text = (String) contents
						.getTransferData(DataFlavor.stringFlavor);
			} catch (Exception de) {
			}
			note.replaceRange(text, note.getSelectionStart(), note
					.getSelectionEnd());
		}
		/** ****退出操作******OK */
		else if (e.getSource() == quit) {
			onWindowClosing();
		}
		/** ******格式菜单中 自动换行*******OK* */
		else if (e.getSource() == wrap) {
			if (wrap.isSelected()) {
				note.setLineWrap(true);
				note.setWrapStyleWord(true);//自动换行时不拆分单词
			} else
				note.setLineWrap(false);
		}
		/** ********全选************OK */
		else if (e.getSource() == selectAll || e.getSource() == popSelectAll) {
			note.selectAll();
		}
		/** ******时间和日期**********OK */
		else if (e.getSource() == dateAndTime) {
			SimpleDateFormat sdf = new SimpleDateFormat("yy-MM-dd",
					Locale.SIMPLIFIED_CHINESE);
			sdf.applyPattern("yyyy年MM月yy日-HH时mm分ss秒");
			String timeStr = sdf.format(new Date());
			note.insert(timeStr, note.getCaretPosition());
		}
		/** *****删除******OK* */
		else if (e.getSource() == delete || e.getSource() == popDelete) {
			// 将选中的文字用""代替
			note.replaceSelection("");
		}
		/** *******查找******OK* */
		else if (e.getSource() == find) {
			findDlg = new FindDlg(this);
			findDlg.setBounds(400, 300, 400, 140);
			findDlg.setVisible(true);
		}
		/** *****查找下一个********OK */
		else if (e.getSource() == findNext) {
			findDlg = new FindDlg(this);
			findDlg.setBounds(400, 300, 400, 140);
			findDlg.setVisible(true);
		}
		/** ******替换*************OK* */
		else if (e.getSource() == replace) {
			replaceDlg = new ReplaceDlg(this);
			replaceDlg.setBounds(400, 300, 400, 150);
			replaceDlg.setVisible(true);
		}
		/** ********转到*************** */
		else if (e.getSource() == goTo) {
			goToDlg = new GoToDlg(this);
			goToDlg.setBounds(400, 300, 350, 100);
			goToDlg.setVisible(true);
		}
		/** ********字体**********OK** */
		else if (e.getSource() == font) {
			fontDlg = new FontDlg(this);
			Dimension size = fontDlg.getSize();
			fontDlg.setBounds(400, 300, size.width, size.height);
			fontDlg.setVisible(true);
		}
		/********状态栏*******/
		else if(e.getSource() == status){
			if (status.isSelected()) {
				statusBar.setVisible(true);
			} else
				statusBar.setVisible(false);
		}
		/*******撤销功能*********OK(只能撤销一次)*/
		else if(e.getSource() == retract){
			if(retractNum == 0){
				str2 = note.getText();
				note.setText(str1);				
				retractNum = 1;
			}
			else {
				str1 = note.getText();
				note.setText(str2);			
				retractNum = 0;
			}
		}
	}
	
	/**
	 * 主函数
	 * 
	 * @param args
	 *            没有使用到这个参数
	 */
	public static void main(String args[]) {
		NotePad notepad = new NotePad();
		notepad.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}