java记事本
------- android培训、java培训、期待与您交流！ ----------
import java.awt.*; import java.awt.event.*; import java.io.*; import java.awt.datatransfer.*; import java.util.Date; public class NoteBook { private Frame f; private TextArea ta; private MenuBar mb; private Menu m1file, m2editor, m3formart, m4view, m5help; private MenuItem m1new, m1open, m1save, m1saveas, m1pageset, m1print,m1quit; private MenuItem m2back, m2copy, m2cute, m2plast, m2delete, m2find, m2findnext, m2replace, m2goto, m2selectall, m2date; private MenuItem m3autonextline, m3font; private MenuItem m4statebar; private MenuItem m5helpme, m5about; private Dialog dhelp,dabout; private Label labout,lhelp; private Button bhelp,babout; private FileDialog openDia, saveDia; private File file = null; private Clipboard sysClip = Toolkit.getDefaultToolkit().getSystemClipboard(); NoteBook() { init(); } public static void main(String[] args) { new NoteBook(); } void init() { f = new Frame("自制记事本"); f.setBounds(100, 100, 800, 800); // f.setLayout(new FlowLayout()); mb = new MenuBar(); m1file = new Menu("文件"); m1new = new MenuItem("新建"); m1file.add(m1file); m1open = new MenuItem("打开"); m1file.add(m1open); m1save = new MenuItem("保存"); m1file.add(m1save); m1saveas = new MenuItem("另存为"); m1file.add(m1saveas); m1pageset = new MenuItem("-页面设置"); m1file.add(m1pageset); m1print = new MenuItem("-打印"); m1file.add(m1print); m1quit = new MenuItem("退出"); m1file.add(m1quit); m2editor = new Menu("编辑"); m2back = new MenuItem("-撤销"); m2editor.add(m2back); m2copy = new MenuItem("复制"); m2editor.add(m2copy); m2cute = new MenuItem("剪切"); m2editor.add(m2cute); m2plast = new MenuItem("粘贴"); m2editor.add(m2plast); m2delete = new MenuItem("删除"); m2editor.add(m2delete); m2find = new MenuItem("-查找"); m2editor.add(m2find); m2findnext = new MenuItem("-查找下一个"); m2editor.add(m2findnext); m2replace = new MenuItem("-替换"); m2editor.add(m2replace); m2goto = new MenuItem("-转到"); m2editor.add(m2goto); m2selectall = new MenuItem("全选"); m2editor.add(m2selectall); m2date = new MenuItem("日期"); m2editor.add(m2date); m3formart = new Menu("格式"); m3autonextline=new MenuItem("-自动换行"); m3formart.add(m3autonextline); m3font = new MenuItem("-字体设置"); m3formart.add(m3font); m4view = new Menu("查看"); m4statebar = new MenuItem("-状态栏"); m4view.add(m4statebar); m5help = new Menu("帮助"); m5helpme = new MenuItem("帮助"); m5help.add(m5helpme); m5about = new MenuItem("关于"); m5help.add(m5about); mb.add(m1file); mb.add(m2editor); mb.add(m3formart); mb.add(m4view); mb.add(m5help); f.setMenuBar(mb); openDia = new FileDialog(f, "打开", FileDialog.LOAD); saveDia = new FileDialog(f, "打开", FileDialog.SAVE); ta = new TextArea(); f.add(ta); dhelp = new Dialog(f,"帮助",true); dabout= new Dialog(f,"关于",true);; lhelp = new Label("很简单，实现了部分功能。菜单中没有\"-\"的都实现了"); labout = new Label("由于换行符号的问题，剪切和删除有bug"); bhelp = new Button("确定"); babout = new Button("确定"); dhelp.add(lhelp); dhelp.add(bhelp); dabout.add(labout); dabout.add(babout); dhelp.setBounds(200, 200, 500, 100); dabout.setBounds(200, 200, 500, 100); dhelp.setLayout(new FlowLayout()); dabout.setLayout(new FlowLayout()); myEvent(); f.setVisible(true); } private void myEvent() { m1open.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { openDia.setVisible(true); String dirPath = openDia.getDirectory(); String fileName = openDia.getFile(); if(dirPath==null || fileName==null) return ; ta.setText(""); file = new File(dirPath,fileName); try { BufferedReader bufr = new BufferedReader(new FileReader(file)); String line = null; while((line=bufr.readLine())!=null) ta.append(line+"\r\n"); bufr.close(); } catch (IOException ex) { throw new RuntimeException("读取失败"); } } }); m1save.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (file == null) { saveDia.setVisible(true); String dirPath = saveDia.getDirectory(); String fileName = saveDia.getFile(); if (dirPath == null || fileName == null) return; file = new File(dirPath, fileName); } try { BufferedWriter bufw = new BufferedWriter(new FileWriter(file)); String text = ta.getText(); bufw.write(text); bufw.close(); } catch (IOException ex) { throw new RuntimeException(); } } }); m1saveas.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveDia.setVisible(true); String dirPath = saveDia.getDirectory(); String fileName = saveDia.getFile(); if (dirPath == null || fileName == null) return; file = new File(dirPath, fileName); try { BufferedWriter bufw = new BufferedWriter(new FileWriter(file)); String text = ta.getText(); bufw.write(text); bufw.close(); } catch (IOException ex) { throw new RuntimeException(); } } }); m2copy.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String selected = ta.getSelectedText(); if (selected.length() > 0) copyToClipboard(selected); } }); m2cute.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String selected = ta.getSelectedText(); if (selected.length() > 0){ int start = ta.getSelectionStart(); int end = ta.getSelectionEnd(); copyToClipboard(selected); ta.replaceRange("", start,end); } } }); m2plast.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String selected = ta.getSelectedText(); String contens = copyFromClipboard(); if (selected.length() != 0){ int start = ta.getSelectionStart(); int end = ta.getSelectionEnd(); ta.replaceRange(contens, start,end); } else{ int pos = ta.getCaretPosition() ; ta.insert(contens, pos); } } }); m2delete.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String selected = ta.getSelectedText(); if (selected.length() != 0){ int start = ta.getSelectionStart(); int end = ta.getSelectionEnd(); ta.replaceRange("", start,end); } } }); m2selectall.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ ta.selectAll(); } }); m2date.addActionListener(new ActionListener(){ @SuppressWarnings("deprecation") public void actionPerformed(ActionEvent e){ String selected = ta.getSelectedText(); Date myDate = new Date(); String contens = myDate.toLocaleString(); //contens = contens.substring(0,10); contens = contens.replaceAll("\\s\\S+$",""); if (selected.length() != 0){ int start = ta.getSelectionStart(); int end = ta.getSelectionEnd(); ta.replaceRange(contens, start,end); } else{ int pos = ta.getCaretPosition() ; ta.insert(contens, pos); } } }); m5helpme.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ dhelp.setVisible(true); } }); m5about.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ dabout.setVisible(true); } }); dabout.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { dabout.setVisible(false); } }); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); m1quit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); bhelp.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dhelp.setVisible(false); } }); dhelp.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { dhelp.setVisible(false); } }); babout.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dabout.setVisible(false); } }); dabout.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { dabout.setVisible(false); } }); } public String copyFromClipboard() { String ret = ""; Transferable clipTf = sysClip.getContents(null); if (clipTf != null) { if (clipTf.isDataFlavorSupported(DataFlavor.stringFlavor)) { try { ret = (String) clipTf .getTransferData(DataFlavor.stringFlavor); } catch (Exception e) { e.printStackTrace(); } } } return ret; } public void copyToClipboard(String writeMe) { Transferable tText = new StringSelection(writeMe); sysClip.setContents(tText, null); } }
相对于毕老师的视频中的代码，增加了剪贴板的操作。但有一个bug：TextArea中的replaceRange和replaceText都有问题，似乎是忽略换行符。但TextComponent中的getCaretPosition和getSelectionEnd返回的位置是正确的。两者不是很一致。
简单的gui还是比较容易实现，一遍做下来，我觉得思路就是：
1、先构思、在纸上画。
2、用代码先把个组件的布局搞好。先搞大的，大的搞好再添加小的。
3、为各部件添加事件机制，这个不需要记太多，只要在需要的时候能找到就好。
4、多运行调试几遍。
