来自：https://blog.csdn.net/qq_39169598/article/details/84726959
原创不易，转载请加上作者
一、需求
编程实现一个文本编辑器，使其具有新建、打开、保存，编辑（查找、替换、大小写转换等）、统计（字数、行数、字符数等）、格式（字体设置、字体大小、字体颜色、背景颜色等）等功能。
要求：基于JFrame窗体设计、使用菜单进行功能选择。
二、工程目录
三、项目代码
TestGui类
package T_1029;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class TestGui extends JFrame {
private static final long serialVersionUID = 1L;
private int flagFile=0;
public TestGui() {
JFrame f = new JFrame("文本编辑器");
f.setSize(800, 600);
f.setLocation(200, 200);
JMenuBar mb = new JMenuBar();
//菜单栏
JMenu mFile = new JMenu("文件 (F)");
mFile.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
JMenu mEdit = new JMenu("编辑 (E)");
mEdit.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
JMenu mForm = new JMenu("格式 (O)");
mForm.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
JMenu mHelp = new JMenu("帮助 (H)");
mHelp.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
// 菜单项
JMenuItem NewFile =new JMenuItem("新建(N)");
NewFile.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mFile.add(NewFile);
JMenuItem OpenFile=new JMenuItem("打开(O)");
OpenFile.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mFile.add(OpenFile);
JMenuItem SaveFile=new JMenuItem("保存(S)");
SaveFile.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mFile.add(SaveFile);
JMenuItem Search=new JMenuItem("查找(F)");
Search.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mEdit.add(Search);
JMenuItem Replace=new JMenuItem("替换(G)");
Replace.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mEdit.add(Replace);
JCheckBoxMenuItem FontChange=new JCheckBoxMenuItem("大小写转换(R)");
FontChange.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mEdit.add(FontChange);
JMenuItem FontCount=new JMenuItem("统计(C)");
FontCount.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mEdit.add(FontCount);
JMenuItem SetFont=new JMenuItem("字体设置");
SetFont.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mForm.add(SetFont);
JMenuItem SetBackColor=new JMenuItem("设置背景颜色");
SetBackColor.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mForm.add(SetBackColor);
JMenuItem About=new JMenuItem("关于文本编辑器");
About.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
mHelp.add(About);
JTextArea textArea = new JTextArea();
//文本框自动换行
textArea.setLineWrap(true);
//设置文本框字体
textArea.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 26));
JPanel panel = new JPanel(new BorderLayout());//使用边界布局
JLabel label=new JLabel(" ");
label.setHorizontalAlignment(label.RIGHT);//右对齐
panel.add(label,BorderLayout.SOUTH);//向窗口添加状态栏标签
//实例化滚动面板
JScrollPane scrollPane = new JScrollPane();
//显示垂直滚动条
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
//文本框填入滚动面板
scrollPane.setViewportView(textArea);
//动态面板添加入窗口
f.getContentPane().add(scrollPane);
panel.add(scrollPane,BorderLayout.CENTER);
f.setContentPane(panel);
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
//设置文本框内容改变的监听器
textArea.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
flagFile=1;
}
@Override
public void insertUpdate(DocumentEvent e) {
flagFile=1;
}
@Override
public void changedUpdate(DocumentEvent e) {
// TODO 自动生成的方法存根
}
});
//查找的监听器
Search.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
new HSearchText(f,textArea);
}
});
//替换的监听器
Replace.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
new HReplaceText(f,textArea);
}
});
//新建文件的监听器
NewFile.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
HFile hFile=new HFile();
if(flagFile==1){
int result=JOptionPane.showConfirmDialog(f,
"是否保存更改?",
"记事本", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if(result==JOptionPane.OK_OPTION){
hFile.saveFile(f, textArea);//另存为
}else if(result==JOptionPane.NO_OPTION){
textArea.setText("");
}
flagFile=0;
}
else {
textArea.setText("");
f.setTitle("新建记事本");
}
}
});
//打开文件的监听器
OpenFile.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
HFile hFile=new HFile();
if(flagFile==1) {
int result=JOptionPane.showConfirmDialog(f,
"是否保存更改?",
"记事本-保存", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if(result==JOptionPane.OK_OPTION){
hFile.saveFile(f, textArea);
flagFile=0;
}
else if(result==JOptionPane.NO_OPTION)
flagFile=0;
}
else if(flagFile==0) {
hFile.openFile(f, textArea);
}
}
});
//保存文件的监听器
SaveFile.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
new HFile().saveFile(f, textArea);
flagFile=0;
}
});
//统计的监听器
FontCount.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
new HFontCount(textArea);
}
});
//字体设置的监听器
SetFont.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
new HSetFont(f,textArea);
}
});
//大小写转换的监听器
FontChange.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
if(FontChange.isSelected()) {
String string=textArea.getText();
char[] chars = string.toCharArray();
for (int i = 0, length = chars.length; i < length; i++) {
char c = chars[i];
//判断字母是不是大写，如果是大写变为小写
if (Character.isUpperCase(c)){
chars[i] = Character.toLowerCase(c);
continue;
}
//如果为小写，变为大写
chars[i] = Character.toUpperCase(c);
}
String str1 = new String(chars);
textArea.setText(str1);
}
}
});
//设置背景颜色的监听器
SetBackColor.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Color color = JColorChooser.showDialog(f, "选取颜色", null);
// 如果用户取消或关闭窗口, 则返回的 color 为 null
if (color == null) {
return;
}
textArea.setBackground(color);
}
});
//关于文本编辑器的监听器
About.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFrame f = new JFrame("关于文本编辑器");
//弹出无提示图片的消息窗口
JOptionPane.showMessageDialog(
f,
"JAVA课设\nMake By d幻月b",
"文本编辑器",
JOptionPane.PLAIN_MESSAGE
);
}
});
//窗口关闭的监听器，提示保存
f.addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
// TODO 自动生成的方法存根
}
@Override
public void windowIconified(WindowEvent e) {
// TODO 自动生成的方法存根
}
@Override
public void windowDeiconified(WindowEvent e) {
// TODO 自动生成的方法存根
}
@Override
public void windowDeactivated(WindowEvent e) {
// TODO 自动生成的方法存根
}
@Override
public void windowClosing(WindowEvent e) {
HFile hFile=new HFile();
if(flagFile==1){
int result=JOptionPane.showConfirmDialog(f,
"是否将更改保存到新建记事本?",
"记事本", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if(result==JOptionPane.OK_OPTION){
hFile.saveFile(f, textArea);//另存为
flagFile=0;
}
}
}
@Override
public void windowClosed(WindowEvent e) {
}
@Override
public void windowActivated(WindowEvent e) {
// TODO 自动生成的方法存根
}
});
textArea.addKeyListener(new KeyAdapter() {
//按下某键
public void keyPressed(KeyEvent e) {
int row = 0;
int col = 0;
int pos = textArea.getCaretPosition(); //获得光标位置
try {
row = textArea.getLineOfOffset(pos) + 1; //返回行从0算起,要+1
col = pos-textArea.getLineStartOffset(row-1)+1;
}catch(Exception exception) {
}
label.setText("第" + row+"行，" +"第"+col+"列 " );
}
// 释放某键
public void keyReleased(KeyEvent e) {
int row = 0;
int col = 0;
int pos = textArea.getCaretPosition(); //获得光标位置
try {
row = textArea.getLineOfOffset(pos) + 1; //返回行从0算起,要+1
col = pos-textArea.getLineStartOffset(row-1)+1;
}catch(Exception exception) {
}
label.setText("第" + row+"行，" +"第"+col+"列 " );
}
});
//新建文件的快捷键
NewFile.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_N,
java.awt.Event.CTRL_MASK));
NewFile.setMnemonic('N');
//打开文件的快捷键
OpenFile.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_O,
java.awt.Event.CTRL_MASK));
OpenFile.setMnemonic('O');
//保存文件的快捷键
SaveFile.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S,
java.awt.Event.CTRL_MASK));
SaveFile.setMnemonic('S');
//统计字数的快捷键
FontCount.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_C,
java.awt.Event.ALT_MASK));
FontCount.setMnemonic('C');
//查找的快捷键
Search.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_F,
java.awt.Event.CTRL_MASK));
Search.setMnemonic('F');
//替换的快捷键
Replace.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_G,
java.awt.Event.CTRL_MASK));
Replace.setMnemonic('G');
//大小写转换的快捷键
FontChange.setAccelerator(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_R,
java.awt.Event.CTRL_MASK));
FontChange.setMnemonic('R');
//载入4个一级菜单
mb.add(mFile);
mb.add(mEdit);
mb.add(mForm);
mb.add(mHelp);
f.setJMenuBar(mb);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public static void main(String[] args) {
new TestGui();
}
}
HFile类
package T_1029;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
public class HFile {
public void openFile(JFrame f,JTextArea textArea) {
// 创建一个默认的文件选取器
JFileChooser fileChooser = new JFileChooser();
// 设置默认显示的文件夹为当前文件夹
fileChooser.setCurrentDirectory(new File("."));
// 设置文件选择的模式（只选文件、只选文件夹、文件和文件均可选）
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
// 设置是否允许多选
fileChooser.setMultiSelectionEnabled(false);
// 设置默认使用的文件过滤器
fileChooser.setFileFilter(new FileNameExtensionFilter("txt(*.txt)", "txt"));
// 打开文件选择框
int result = fileChooser.showOpenDialog(f);
if(result==1)
return ;
if (result == JFileChooser.APPROVE_OPTION) {
try {
textArea.setText("");
File file = fileChooser.getSelectedFile();
FileInputStream fis=new FileInputStream(file);
try{
//读取数据，并将读取到的数据存储到数组中
byte[] data = new byte[1024]; //数据存储的数组
int i = fis.read(data);
//解析数据
String s = new String(data,0,i);
textArea.append(s);
}catch(Exception e){
e.printStackTrace();
}finally{
try{
fis.close();
}catch(Exception e){
}
}
f.setTitle(file.getName()+" - 文本编辑器");
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void saveFile(JFrame f,JTextArea textArea) {
// 创建一个默认的文件选取器
JFileChooser fileChooser = new JFileChooser();
// 设置默认显示的文件夹为当前文件夹
fileChooser.setCurrentDirectory(new File("."));
// 设置打开文件选择框后默认输入的文件名
fileChooser.setSelectedFile(new File("新建记事本.txt"));
// 打开文件选择框
int select = fileChooser.showSaveDialog(f);
if (select == JFileChooser.APPROVE_OPTION) {
// 保存文本内容
File file = fileChooser.getSelectedFile();
try {
//覆盖文件式写入
OutputStream outToFileEnd = new FileOutputStream(file);
String string = textArea.getText();
byte[] bs = string.getBytes();
outToFileEnd.write(bs);
outToFileEnd.close();
f.setTitle(file.getName()+" - 文本编辑器");
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
}
HFontCount类
package T_1029;
import java.awt.Font;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
public class HFontCount {
public HFontCount(JTextArea textArea){
String line=textArea.getText();
JFrame f = new JFrame("统计");
//弹出无提示图片的消息窗口
JOptionPane.showMessageDialog(
f,
"字数："+countChinese(line)+"\n字符数："+line.length()+"\n行数："+textArea.getLineCount(),
"统计",
JOptionPane.PLAIN_MESSAGE
);
}
public static int countChinese(String str) {
int count = 0;
//正则表达式匹配汉字|全角符号|数字|。|英文字母
Pattern p = Pattern.compile("[\\u4e00-\\u9fa5]|[\\uFE30-\\uFFA0]|[0-9]|[\\u3001-\\u3002]|[a-zA-Z]");
Matcher m = p.matcher(str);
while(m.find()){
count++;
}
return count;
}
}
HReplaceText类
package T_1029;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class HReplaceText {
public HReplaceText(JFrame f,JTextArea textArea) {
JDialog jdlg = new JDialog(f, "替换", true);
jdlg.setSize(453, 200);
jdlg.setLocationRelativeTo(null);
jdlg.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
JPanel panel=new JPanel();
panel.setLayout(null);
JLabel label=new JLabel("查找内容：");
JLabel label2=new JLabel("替换为：");
JLabel count=new JLabel("找到0个");
JTextArea ftext=new JTextArea();
JTextArea rtext=new JTextArea();
JButton findnext=new JButton("查找下一个");
JButton replace=new JButton("替换");
JButton allreplace=new JButton("全部替换");
JButton no=new JButton("取消");
JCheckBox matchcase=new JCheckBox("区分大小写");
//创建两个单选按钮
JRadioButton up = new JRadioButton("向上替换");
JRadioButton down = new JRadioButton("向下替换");
//创建按钮组，把两个单选按钮添加到该组
ButtonGroup btnGroup = new ButtonGroup();
btnGroup.add(up);
btnGroup.add(down);
// 设置第一个单选按钮选中
up.setSelected(true);
label.setBounds(20,20,93,22);
label2.setBounds(20,45,93,22);
count.setBounds(20, 55, 80, 85);
ftext.setBounds(100,20,200,22);
rtext.setBounds(100,48,200,22);
findnext.setBounds(320, 18, 105, 32);
replace.setBounds(320, 55, 105, 32);
allreplace.setBounds(320, 92, 105, 32);
no.setBounds(320, 128, 105, 32);
matchcase.setBounds(15, 120, 100, 55);
up.setBounds(130, 120, 80, 55);
down.setBounds(230, 120, 80, 55);
//初始化按键状态
findnext.setEnabled(false);
replace.setEnabled(false);
allreplace.setEnabled(false);
//查找文本框的监听器，改变按钮状态
ftext.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
if(ftext.getText().equals("")) {
findnext.setEnabled(false);
replace.setEnabled(false);
allreplace.setEnabled(false);
}
}
@Override
public void insertUpdate(DocumentEvent e) {
findnext.setEnabled(true);
replace.setEnabled(true);
allreplace.setEnabled(true);
}
@Override
public void changedUpdate(DocumentEvent e) {
// TODO 自动生成的方法存根
}
});
//查找下一个的监听器
findnext.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int c=0;
int a = 0, b = 0;
int FindStartPos = textArea.getCaretPosition();
String strA,strB;
// 选中区分大小写,大小写转换
if (matchcase.isSelected()) {
strA = textArea.getText();
strB = ftext.getText();
} else {
strA = textArea.getText().toLowerCase();
strB = ftext.getText().toLowerCase();
}
//向上查找，否则向下查找
if (up.isSelected()) {
a = strA.lastIndexOf(strB, FindStartPos - ftext.getText().length() - 1);
} else if (down.isSelected()) {
a = strA.indexOf(strB, FindStartPos - ftext.getText().length() + 1);
}
//查找到边界
if (a > -1) {
if (up.isSelected()) {
textArea.setCaretPosition(a);
b = ftext.getText().length();
textArea.select(a, a + b);
} else if (down.isSelected()) {
textArea.setCaretPosition(a);
b = ftext.getText().length();
textArea.select(a, a + b);
}
} else {
JOptionPane.showMessageDialog(null, "找不到查找的内容",
"查找", JOptionPane.INFORMATION_MESSAGE);
}
//显示关键字的总数量
Pattern p=Pattern.compile(ftext.getText());
Matcher m=p.matcher(textArea.getText());
while(m.find()) {
c++;
}
count.setText("找到"+c+"个");
}
});
//替换的监听器
replace.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (rtext.getText().length() == 0 && textArea.getSelectedText() != null) {
textArea.replaceSelection("");
}
if (rtext.getText().length() > 0 && textArea.getSelectedText() != null) {
textArea.replaceSelection(rtext.getText());
}
}
});
//替换全部的监听器
allreplace.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//显示关键字的总数量
int c=0;
Pattern p=Pattern.compile(ftext.getText());
Matcher m=p.matcher(textArea.getText());
while(m.find()) {
c++;
}
count.setText("替换"+c+"个");
//替换全部关键字
String str=textArea.getText();
str=str.replace(ftext.getText(), rtext.getText());
textArea.setText(str);
}
});
//取消的监听器
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jdlg.setVisible(false);
}
});
label.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
label2.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
count.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
ftext.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
rtext.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
findnext.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
replace.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
allreplace.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
no.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
panel.add(label);
panel.add(label2);
panel.add(count);
panel.add(ftext);
panel.add(rtext);
panel.add(findnext);
panel.add(no);
panel.add(replace);
panel.add(allreplace);
panel.add(matchcase);
panel.add(up);
panel.add(down);
jdlg.setResizable(false);
jdlg.setContentPane(panel);
jdlg.setVisible(true);
}
}
HSearchText类
package T_1029;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class HSearchText {
public HSearchText(JFrame f,JTextArea textArea) {
JDialog jdlg = new JDialog(f, "查找", true);
jdlg.setSize(453, 150);
jdlg.setLocationRelativeTo(null);
jdlg.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
JPanel panel=new JPanel();
panel.setLayout(null);
JLabel label=new JLabel("查找内容：");
JLabel count=new JLabel("找到0个");
JTextArea ftext=new JTextArea();
JButton findnext=new JButton("查找下一个");
JButton no=new JButton("取消");
JCheckBox matchcase=new JCheckBox("区分大小写");
//创建两个单选按钮
JRadioButton up = new JRadioButton("向上查找");
JRadioButton down = new JRadioButton("向下查找");
//创建按钮组，把两个单选按钮添加到该组
ButtonGroup btnGroup = new ButtonGroup();
btnGroup.add(up);
btnGroup.add(down);
// 设置第一个单选按钮选中
up.setSelected(true);
label.setBounds(20,20,93,22);
count.setBounds(20, 55, 80, 35);
ftext.setBounds(100,20,200,22);
findnext.setBounds(320, 18, 105, 32);
no.setBounds(320, 53, 105, 32);
matchcase.setBounds(15, 90, 100, 25);
up.setBounds(130, 90, 80, 25);
down.setBounds(230, 90, 80, 25);
//初始化查找按键
findnext.setEnabled(false);
//设置文本框和按钮的状态
ftext.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
if(ftext.getText().equals(""))
findnext.setEnabled(false);
}
@Override
public void insertUpdate(DocumentEvent e) {
findnext.setEnabled(true);
}
@Override
public void changedUpdate(DocumentEvent e) {
// TODO 自动生成的方法存根
}
});
//查找下一个的监听器
findnext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int c=0;
int a = 0, b = 0;
int FindStartPos = textArea.getCaretPosition();
String strA,strB;
// 选中区分大小写,大小写转换
if (matchcase.isSelected()) {
strA = textArea.getText();
strB = ftext.getText();
} else {
strA = textArea.getText().toLowerCase();
strB = ftext.getText().toLowerCase();
}
//向上查找，否则向下查找
if (up.isSelected()) {
a = strA.lastIndexOf(strB, FindStartPos - ftext.getText().length() - 1);
} else if (down.isSelected()) {
a = strA.indexOf(strB, FindStartPos - ftext.getText().length() + 1);
}
//查找到边界
if (a > -1) {
if (up.isSelected()) {
textArea.setCaretPosition(a);
b = ftext.getText().length();
textArea.select(a, a + b);
} else if (down.isSelected()) {
textArea.setCaretPosition(a);
b = ftext.getText().length();
textArea.select(a, a + b);
}
} else {
JOptionPane.showMessageDialog(null, "找不到查找的内容",
"查找", JOptionPane.INFORMATION_MESSAGE);
}
//显示关键字的总数量
Pattern p=Pattern.compile(ftext.getText());
Matcher m=p.matcher(textArea.getText());
while(m.find()) {
c++;
}
count.setText("找到"+c+"个");
}
});
//取消的监听器
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jdlg.setVisible(false);
}
});
label.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
count.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
ftext.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
findnext.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
no.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
panel.add(label);
panel.add(count);
panel.add(ftext);
panel.add(findnext);
panel.add(no);
panel.add(matchcase);
panel.add(up);
panel.add(down);
jdlg.setResizable(false);
jdlg.setContentPane(panel);
jdlg.setVisible(true);
}
}
HSetFont类
package T_1029;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class HSetFont extends JDialog{
public HSetFont(JFrame f,JTextArea textArea) {
//获取系统字体库
GraphicsEnvironment e = GraphicsEnvironment.getLocalGraphicsEnvironment();
String[] fontNames = e.getAvailableFontFamilyNames();
String[] fontStyle=new String[]{
"常规","粗体","斜体","粗斜体"};
Integer[] fontsize=new Integer[] {
8,9,10,11,12,13,14,16,18,20,22,24,26,28,30,32,36,48,72};
JDialog jdlg = new JDialog(f, "字体设置", true);
jdlg.setSize(453, 325);
jdlg.setLocationRelativeTo(null);
jdlg.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
JPanel panel=new JPanel();
panel.setLayout(null);
JButton yes=new JButton("确定");
JButton no=new JButton("取消");
JButton setfontcolor=new JButton("字体颜色");
JLabel fonts=new JLabel("字体:");
JLabel style=new JLabel("样式:");
JLabel size=new JLabel("大小:");
JLabel cg=new JLabel("AaBbCc");
// 创建下拉列表框
final JComboBox<String> comboBox = new JComboBox<String>(fontNames);
final JComboBox<String> comboBox2=new JComboBox<String>(fontStyle);
final JComboBox<Integer> comboBox3=new JComboBox<Integer>(fontsize);
// 添加条目选中状态改变的监听器
comboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
// 只处理选中的状态
if (e.getStateChange() == ItemEvent.SELECTED) {
cg.setFont(new Font((String) comboBox.getSelectedItem(),
cg.getFont().getStyle(), cg.getFont().getSize()));
}
}
});
comboBox2.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange()==ItemEvent.SELECTED) {
if(comboBox2.getSelectedItem().equals("常规")) {
cg.setFont(new Font(cg.getFont().getName(), Font.PLAIN,
cg.getFont().getSize()));
}
else if(comboBox2.getSelectedItem().equals("粗体")){
cg.setFont(new Font(cg.getFont().getName(), Font.BOLD,
cg.getFont().getSize()));
}
else if(comboBox2.getSelectedItem().equals("斜体")){
cg.setFont(new Font(cg.getFont().getName(), Font.ITALIC,
cg.getFont().getSize()));
}
else if(comboBox2.getSelectedItem().equals("粗斜体")) {
cg.setFont(new Font(cg.getFont().getName(), Font.BOLD+ Font.ITALIC,
cg.getFont().getSize()));
}
}
}
});
comboBox3.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange()==ItemEvent.SELECTED) {
cg.setFont(new Font(cg.getFont().getName(), cg.getFont().getStyle(),
(int) comboBox3.getSelectedItem()));
}
}
});
setfontcolor.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Color color = JColorChooser.showDialog(f, "选取颜色", null);
// 如果用户取消或关闭窗口, 则返回的 color 为 null
if (color == null) {
return;
}
textArea.setForeground(color);
}
});
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textArea.setFont(cg.getFont());
jdlg.setVisible(false);
}
});
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jdlg.setVisible(false);
}
});
//设置元件位置和宽高
fonts.setBounds(20,20,45,18);
style.setBounds(190,20,45,18);
size.setBounds(313,20,45,18);
comboBox.setBounds(20,42,170,22);
comboBox2.setBounds(190,42,119,22);
comboBox3.setBounds(309, 42, 119, 22);
cg.setBounds(30,89,378,137);
setfontcolor.setBounds(20,249,102,30);
yes.setBounds(300,249,62,30);
no.setBounds(366,249,62,30);
fonts.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
style.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
size.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
cg.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 12));
setfontcolor.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 12));
yes.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
no.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 13));
comboBox.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
comboBox2.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
comboBox3.setFont(new Font("Microsoft YaHei UI", Font.PLAIN, 16));
// 设置字体下拉框为文本框的字体样式
comboBox.setSelectedItem(textArea.getFont().getFontName());
comboBox3.setSelectedItem(textArea.getFont().getSize());
comboBox2.setSelectedIndex(textArea.getFont().getStyle());
// 添加到内容面板
panel.add(fonts);
panel.add(style);
panel.add(size);
panel.add(comboBox);
panel.add(comboBox2);
panel.add(comboBox3);
panel.add(setfontcolor);
panel.add(yes);
panel.add(no);
panel.add(cg);
jdlg.setResizable(false);
jdlg.setContentPane(panel);
jdlg.setVisible(true);
}
}
四、效果展示
今天的文章Java课设——文本编辑器分享到此就结束了，感谢您的阅读，如果确实帮到您，您可以动动手指转发给其他人。
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