用Java的Swing包做一个记事本, 主要用到:
1. 顶层容器: JFrame
2. 中间容器: JPanel, Scrollpane, JMenubar.
3. 基本组件: JLabel, JButton, JTextField, JTextArea.
4. 布局管理器: FlowLayout, BoxLayout.
5. 其他: Java事件监听, Java文件读取, Java访问剪切板
效果图:
结构:
分为菜单栏和文本栏.
1. 菜单栏: 菜单栏分为四个子菜单(File, Edit, View, Help), 其中各个拥有不同的功能, 对每个功能一一添加事件监听器, 实现功能.
2. 文本栏: 一个简单的JTextArea组件.
代码:
package cn.notebook02;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
/*
* @author YancyKahn
*
* @version 2.0
*
* @date 2018/4/9
*
* @email [email protected]
*
* @blog https://my.csdn.net/qq_37753409
*/
public class NoteBook {
public static void main(String[] args) {
Text t = new Text("DocumentFile", null);
t.CreatText();
}
}
class Text {
final static String WorkPath = "D:\\File\\";
final static String WorkName = "NewDocumentFile.txt";
final static String HelpPage = "/*\r\n" + " * @author YancyKahn\r\n" + " * \r\n" + " * @version 2.0\r\n" + " * \r\n"
+ " * @date 2018/4/9\r\n" + " * \r\n" + " * @email [email protected]\r\n" + " * \r\n"
+ " * @blog https://my.csdn.net/qq_37753409\r\n" + " */";
String name;
JFrame frame;
JTextArea tArea = new JTextArea();
Text(String _name, String res) {
this.name = _name;
this.frame = new JFrame(this.name);
tArea.setText(res);
}
Text() {
}
void CreatText() {
/*
* Jframe properties
*/
frame.setSize(1000, 1000);
frame.setLocationRelativeTo(null);
// frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane jsPane = new JScrollPane(tArea);
frame.add(jsPane);
frame.setJMenuBar(addMenuBar());
frame.setVisible(true);
}
private JMenuBar addMenuBar() {
JMenuBar menubar = new JMenuBar();
/*
* 创建一级菜单
*/
JMenu fileMenu = new JMenu("File");
JMenu editMenu = new JMenu("Edit");
JMenu viewMenu = new JMenu("View");
JMenu helpMenu = new JMenu("help");
/*
* add
*/
menubar.add(fileMenu);
menubar.add(editMenu);
menubar.add(viewMenu);
menubar.add(helpMenu);
/*
* fileMenu
*/
JMenuItem newMenuItem = new JMenuItem("new");
JMenuItem openMenuItem = new JMenuItem("open");
JMenuItem saveAsMenuItem = new JMenuItem("save as");
JMenuItem saveMenuItem = new JMenuItem("save");
JMenuItem exitMenuItem = new JMenuItem("exit");
fileMenu.add(newMenuItem);
fileMenu.add(openMenuItem);
fileMenu.addSeparator();
fileMenu.add(saveMenuItem);
fileMenu.add(saveAsMenuItem);
fileMenu.addSeparator(); // separator
fileMenu.add(exitMenuItem);
/*
* editMenu
*/
JMenuItem copyMenuItem = new JMenuItem("copy");
JMenuItem pasteMenuItem = new JMenuItem("paste");
editMenu.add(copyMenuItem);
editMenu.add(pasteMenuItem);
/*
* viewMenu
*/
JMenuItem statisticsMenuItem = new JMenuItem("statistics");
viewMenu.add(statisticsMenuItem);
/*
* helpMenu
*/
JMenuItem ViewHelpMenuItem = new JMenuItem("view help");
JMenuItem AboutHelpMenuItem = new JMenuItem("about help");
helpMenu.add(ViewHelpMenuItem);
helpMenu.addSeparator();
helpMenu.add(AboutHelpMenuItem);
/*
* ActionListener
*/
// fileMenu
newMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
Text t = new Text("new Document", null);
t.CreatText();
}
});
openMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
OpenItem();
}
});
saveAsMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
SaveFile(WorkPath, WorkName, tArea.getText());
}
});
saveAsMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
SaveItem();
}
});
exitMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
frame.dispose();
}
});
// editMenu
copyMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
setSysClipboardText(tArea.getText());
}
});
pasteMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String s = getSysClipboardText();
tArea.setText(s);
}
});
// viewMenu
statisticsMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String s = tArea.getText();
int alphaCount = 0;
int digitCount = 0;
int otherCount = 0;
for (int i = 0; i < s.length(); ++i) {
if (Character.isDigit(s.charAt(i)))
digitCount++;
else if (Character.isAlphabetic(s.charAt(i)))
alphaCount++;
else
otherCount++;
}
JFrame sframe = new JFrame("Statistics");
sframe.setSize(300, 150);
// sframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
sframe.setLayout(new GridLayout(3, 1));
sframe.setLocationRelativeTo(null);
JLabel alpha = new JLabel(" Alpha: " + alphaCount);
JLabel digit = new JLabel(" Digit: " + digitCount);
JLabel other = new JLabel(" Other: " + otherCount);
sframe.add(alpha);
sframe.add(digit);
sframe.add(other);
sframe.addWindowListener(new WindowAdapter() {
@SuppressWarnings("unused")
public void WindowClosing(WindowEvent e) {
sframe.dispose();
}
});
sframe.setVisible(true);
}
});
// helpMenu
ViewHelpMenuItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
Text t = new Text("Help page", HelpPage);
t.CreatText();
}
});
return menubar;
}
/*
* save item
*/
private void SaveItem() {
JFrame iframe = new JFrame("Save");
// iframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
iframe.setLocationRelativeTo(null);
/*
* panel
*/
JPanel panelTop = new JPanel();
JPanel panelMid = new JPanel();
JPanel panelBut = new JPanel();
JTextField textFilePath = new JTextField(10);
JTextField textFileName = new JTextField(10);
JButton SaveButton = new JButton("Save");
iframe.setSize(300, 200);
Box vbox = Box.createVerticalBox();
panelTop.add(new JLabel("file path"));
panelTop.add(textFilePath);
panelMid.add(new JLabel("file name"));
panelMid.add(textFileName);
panelBut.add(SaveButton);
vbox.add(panelTop);
vbox.add(panelMid);
vbox.add(panelBut);
iframe.add(vbox);
/*
* saveButton ActionListener
*/
SaveButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
SaveFile(textFilePath.getText(), textFileName.getText(), tArea.getText());
iframe.dispose();
}
});
iframe.addWindowListener(new WindowAdapter() {
@SuppressWarnings("unused")
public void WindowClosing(WindowEvent e) {
iframe.dispose();
}
});
iframe.setVisible(true);
}
/*
* open item
*/
private void OpenItem() {
JFrame oframe = new JFrame("open");
oframe.setLocationRelativeTo(null);
// oframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
/*
* panel
*/
JPanel panelTop = new JPanel();
JPanel panelBut = new JPanel();
JTextField textFilePathName = new JTextField(10);
JButton OpenButton = new JButton("Open");
oframe.setSize(300, 150);
Box vbox = Box.createVerticalBox();
panelTop.add(new JLabel("file path and name"));
panelTop.add(textFilePathName);
panelBut.add(OpenButton);
vbox.add(panelTop);
vbox.add(panelBut);
oframe.add(vbox);
/*
* button ActionListener
*/
OpenButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s = ReadFile(textFilePathName.getText());
// System.out.println(s);
tArea.setText(s);
oframe.dispose();
}
});
oframe.addWindowListener(new WindowAdapter() {
@SuppressWarnings("unused")
public void WindowClosing(WindowEvent e) {
oframe.dispose();
}
});
oframe.setVisible(true);
}
/*
* save file
*/
private void SaveFile(String savePath, String saveName, String res) {
File file = new File(savePath + saveName);
try {
BufferedWriter out = new BufferedWriter(new FileWriter(file));
out.write(res);
out.flush();
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* read file
*/
private String ReadFile(String openPathName) {
String res = "";
File file = new File(openPathName);
try {
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
String line = br.readLine();
if (line != null)
res += line;
br.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return res;
}
/*
* get system clipboard text
*/
private String getSysClipboardText() {
String res = "";
Clipboard sysclip = Toolkit.getDefaultToolkit().getSystemClipboard();
// 获取剪切板的内容
Transferable clipif = sysclip.getContents(null);
if (clipif != null) {
// 检查为文本类型
if (clipif.isDataFlavorSupported(DataFlavor.stringFlavor)) {
try {
res = (String) clipif.getTransferData(DataFlavor.stringFlavor);
} catch (UnsupportedFlavorException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return res;
}
/*
* set system clipboard text
*/
private void setSysClipboardText(String writeFile) {
Clipboard sysclip = Toolkit.getDefaultToolkit().getSystemClipboard();
Transferable clipif = sysclip.getContents(writeFile);
sysclip.setContents(clipif, null);
}
}