java制作简单记事本.
1、利用学过的布局、容器、组件知识，搭建一个如下图的记事本界面。
2、利用下拉列表和按钮的监听事件，实现改变文本框和文本域的字体样式和颜色。
- 效果展示
- 代码实现
package test;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.*;
import java.util.Date;
public class NotepadDemo extends JFrame {
//创建菜单条
JMenuBar menuBar;
//菜单
JMenu fileMenu,editMenu,formatMenu,viewMenu,helpMenu;
//"文件"的菜单项
JMenuItem fileMenu_Open,fileMenu_Save,fileMenu_Exit;
//“编辑”的菜单项
JMenuItem editMenu_TimeDate;
//“工具”的菜单项
JMenuItem toolMenu_form;
//“查看”的菜单项
JMenuItem viewMenu_Status;
//“帮助”的菜单项
JMenuItem helpMenu_viewHelp,helpMenu_AboutNotepad;
//创建工具栏
JToolBar toolbar;
//下拉列表框
JComboBox JComboBox_fontName,JComboBox_fontStyle,JComboBox_fontSize,JComboBox_fontColor;
JPanel JPanel_textField_textArea,JPanel_textField,JPanel_textArea,JPanel_jLabel;
//添加按钮
JButton jb_add;
//文本框
JTextField jtf;
//文本域
JTextArea textArea;
//为文本域添加滚动条变量
JScrollPane JScrollPane_textArea;
//底部标签
JLabel jl;
//设置文本域默认字体
Font textArea_defaultFont;
//各下拉列表框的数组
String[] fontName,fontStyle,fontSize,fontColor;
//字体监听区变量
String name="楷体",text_Style;
int type;
int size=16;
//设置边框的特性是立体的边界:突起
Border etched = BorderFactory.createEtchedBorder(EtchedBorder.RAISED);
public NotepadDemo(){
//设置标题
this.setTitle("记事本");
//设置窗口位置大小
this.setBounds(400,200,700,500);
//设置窗体背景颜色
this.setBackground(Color.pink);
//this.getContentPane().setBackground(Color.black);
//设置窗口布局方式
this.setLayout(new BorderLayout());
//创建菜单栏
menuBar = new JMenuBar();
menuBar.setBackground(new Color(53,231,244));
//创建菜单
fileMenu = new JMenu("文件(F)");
editMenu = new JMenu("编辑(E)");
formatMenu = new JMenu("工具(T)");
viewMenu = new JMenu("查看(V)");
helpMenu = new JMenu("帮助(H)");
//将菜单添加到菜单栏中
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(formatMenu);
menuBar.add(viewMenu);
menuBar.add(helpMenu);
//创建菜单项
fileMenu_Open = new JMenuItem("打开(O)");
fileMenu_Save = new JMenuItem("保存(S)");
editMenu_TimeDate = new JMenuItem("时间日期");
viewMenu_Status = new JMenuItem("状态栏");
helpMenu_viewHelp = new JMenuItem("查看帮助");
helpMenu_AboutNotepad = new JMenuItem("关于记事本");
fileMenu_Exit = new JMenuItem("退出(X)");
toolMenu_form = new JMenuItem("表格(B)");
//将菜单项添加到菜单中
fileMenu.add(fileMenu_Open);
fileMenu.add(fileMenu_Save);
fileMenu.addSeparator();
fileMenu.add(fileMenu_Exit);
editMenu.add(editMenu_TimeDate);
formatMenu.add(toolMenu_form);
viewMenu.add(viewMenu_Status);
helpMenu.add(helpMenu_viewHelp);
helpMenu.add(helpMenu_AboutNotepad);
//创建工具栏
toolbar = new JToolBar();
toolbar.setBackground(new Color(180,231,29));
toolbar.setLayout(new FlowLayout(FlowLayout.LEFT));
//创建标签
jl = new JLabel("Made in 小李");
//创建面板
JPanel_textField_textArea = new JPanel();
JPanel_textField = new JPanel();
JPanel_textField.setBackground(new Color(200,191,231));
JPanel_textArea = new JPanel();
JPanel_jLabel = new JPanel();
JPanel_textField_textArea.setLayout(new BorderLayout());
JPanel_textArea.setLayout(new GridLayout());
JPanel_textField_textArea.add(JPanel_textField,BorderLayout.NORTH);
JPanel_textField_textArea.add(JPanel_textArea,BorderLayout.CENTER);
//字体数组
fontName=GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
fontStyle= new String[]{"常规", "粗体", "斜体", "粗斜体"};
fontSize= new String[]{"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72"};
fontColor= new String[]{"黑色","红色", "绿色", "黄色", "粉色"};
//创建下拉列表框
JComboBox_fontName = new JComboBox(fontName);
JComboBox_fontName.setEditable(true);
JComboBox_fontName.setBackground(new Color(254,218,234));
JComboBox_fontStyle = new JComboBox(fontStyle);
JComboBox_fontStyle.setEditable(true);
JComboBox_fontStyle.setBackground(new Color(254,218,234));
JComboBox_fontSize = new JComboBox(fontSize);
JComboBox_fontSize.setEditable(true);
JComboBox_fontSize.setBackground(new Color(254,218,234));
JComboBox_fontColor = new JComboBox(fontColor);
JComboBox_fontColor.setEditable(true);
JComboBox_fontColor.setBackground(new Color(254,218,234));
//设置下拉列表框的大小
JComboBox_fontName.setMinimumSize(new Dimension(110,35));
//设置边框特性
JComboBox_fontName.setBorder(etched);
JComboBox_fontStyle.setBorder(etched);
JComboBox_fontSize.setBorder(etched);
JComboBox_fontColor.setBorder(etched);
toolbar.setBorder(etched);
//将列表框添加到工具栏中
toolbar.add(JComboBox_fontName);
toolbar.add(JComboBox_fontStyle);
toolbar.add(JComboBox_fontSize);
toolbar.add(JComboBox_fontColor);
//创建按钮
jb_add = new JButton("添加");
jb_add.setBackground(new Color(248,139,239));
//创建文本框
jtf = new JTextField(60);
jtf.setBackground(new Color(239,228,176));
//创建文本域
textArea = new JTextArea();
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
textArea.setBackground(new Color(200,191,231));
//文本域默认全局字体
textArea_defaultFont = new Font("微软雅黑",Font.PLAIN,16);
textArea.setFont(textArea_defaultFont);
//为文本域添加滚动条
JScrollPane_textArea = new JScrollPane(textArea);
JScrollPane_textArea.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
JScrollPane_textArea.setBorder(etched);
//面板添加
JPanel_textField.add(jtf);
JPanel_textField.add(jb_add);
JPanel_textArea.add(JScrollPane_textArea);
JPanel_jLabel.add(jl,FlowLayout.LEFT);
//窗口添加
this.setJMenuBar(menuBar);//菜单栏
this.add(toolbar,BorderLayout.NORTH);//工具栏
this.add(JPanel_textField_textArea,BorderLayout.CENTER);//面板1
this.add(JPanel_jLabel,BorderLayout.SOUTH);//面板4
//设置窗体可见和关闭事件
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//选项监听事件方法
public void actionListener(){
//按钮监听事件
jb_add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String s = jtf.getText();
textArea.setText(s);
JOptionPane.showMessageDialog(null, "添加成功！");
jtf.setText("");
}
});
//工具监听事件
toolMenu_form.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,"抱歉，此功能尚未实现！！！","警告",JOptionPane.WARNING_MESSAGE);
}
});
//选项文件打开监听事件
fileMenu_Open.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFrame jf = new JFrame();
FileDialog fdopen = new FileDialog(jf, "打开(O)", FileDialog.LOAD);
fdopen.setVisible(true);
BufferedReader in = null;
try {
in = new BufferedReader(new FileReader(fdopen.getDirectory() + fdopen.getFile()));
} catch (FileNotFoundException ex) {
ex.printStackTrace();
}
String str = null;
while(true) {
try {
if (!((str = in.readLine()) != null)) break;
} catch (IOException ex) {
ex.printStackTrace();
}
byte[] bytes = str.getBytes();
String s = new String(bytes);
textArea.setText(s);
}
try {
in.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
//选项文件保存监听事件
fileMenu_Save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFrame jf = new JFrame();
FileDialog fd = new FileDialog(jf, "保存(S)", FileDialog.SAVE);
fd.setVisible(true);
String path = fd.getDirectory();//获取路径
String filename = fd.getFile();//获取文件名
try {
FileOutputStream out = new FileOutputStream(path + filename, false);
String s = textArea.getText();//输出到文件
byte[] b = s.getBytes();
out.write(b);
out.close();
} catch (IOException ex) {
System.out.println(ex);
}
}
});
//编辑选项时间日期监听事件
editMenu_TimeDate.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Date date = new Date();
String sj = new String(String.valueOf(date));
textArea.setText(sj);
}
});
//状态栏监听事件
viewMenu_Status.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,"抱歉，此功能尚未实现！！！","警告",JOptionPane.WARNING_MESSAGE);
}
});
//查看帮助监听事件
helpMenu_viewHelp.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,"抱歉，此功能尚未实现！！！","警告",JOptionPane.WARNING_MESSAGE);
}
});
//关于记事本监听事件
helpMenu_AboutNotepad .addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"============================================\n"+
" 编写者：Alan_木子李 \n"+
" 编写时间：2022-04-30 \n"+
" 不足之处，一起交流学习。 \n"+
" -------------Flighting-------------\n"+
"欢迎使用！！！ \n"+
"============================================\n",
"记事本",JOptionPane.INFORMATION_MESSAGE);
}
});
//文件选项退出监听事件
fileMenu_Exit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
}
//字体设置方法
public void setTextAreaFont(String name,int type,int size){
textArea.setFont(new Font(name,type,size));
jtf.setFont(new Font(name,type,12));
}
//列表项监听事件
public void ItemListener(){
//字体fontName监听
JComboBox_fontName.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
final DefaultComboBoxModel model = new DefaultComboBoxModel(fontName);
if (model.getIndexOf(e.getItem()) < 0) {
model.addElement(e.getItem());
}
name=(String) e.getItem();
setTextAreaFont(name,type,size);
}
});
//字体fontStyle监听
JComboBox_fontStyle.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
final DefaultComboBoxModel model = new DefaultComboBoxModel(fontStyle);
if (model.getIndexOf(e.getItem()) < 0) {
model.addElement(e.getItem());
}
text_Style=(String) e.getItem();
if (text_Style.equals("常规")){
type=Font.PLAIN;
} else if (text_Style.equals("粗体" )){
type=Font.BOLD;
} else if(text_Style.equals("斜体" )){
type=Font.ITALIC;
}else{
type=Font.ITALIC+Font.BOLD;
}
setTextAreaFont(name,type,size);
}
});
//字体fontSize监听
JComboBox_fontSize.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
final DefaultComboBoxModel model = new DefaultComboBoxModel(fontSize);
if (model.getIndexOf(e.getItem()) < 0) {
model.addElement(e.getItem());
}
String s=(String) e.getItem();
size=Integer.parseInt(s);
setTextAreaFont(name,type,size);
}
});
//字体fontColor监听
JComboBox_fontColor.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
final DefaultComboBoxModel model = new DefaultComboBoxModel(fontColor);
if (model.getIndexOf(e.getItem()) < 0) {
model.addElement(e.getItem());
}
String int_color = (String) e.getItem();
if(int_color.equals("黑色")){
jtf.setForeground(Color.black);
textArea.setForeground(Color.black);
}else if(int_color.equals("红色")){
jtf.setForeground(Color.RED);
textArea.setForeground(Color.red);
}else if(int_color.equals("绿色")){
jtf.setForeground(Color.green);
textArea.setForeground(Color.green);
}else if(int_color.equals("黄色")){
jtf.setForeground(Color.yellow);
textArea.setForeground(Color.yellow);
}else{
jtf.setForeground(Color.pink);
textArea.setForeground(Color.pink);
}
}
});
}
public static void main(String[] args) {
NotepadDemo nd = new NotepadDemo();
nd.actionListener();
nd.ItemListener();
//nd.setTextAreaFont(nd.name, nd.type, nd.size);
}
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