Java初学者设计简单文本编译器
本编译器可以实现一些基本功能
(1)所见即所得的文本输入;
(2)能方便地选中文本、复制、剪切、删除和粘贴文本;
(3)具有一般编辑器所具有的查找、替换和文件保存功能;
(4)打印功能;
(5)可以实现设置字体。
实现代码如下：
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.awt.*;
import java.util.regex.*;
public class text3{
public static void main(String args[]){
EditWindow win=new EditWindow();
win.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
}
class EditWindow extends JFrame implements ActionListener{
JFileChooser filechooser = new JFileChooser(); //文件选择器
JMenuBar menubar;
JPopupMenu mouseMenu;
JMenu menu1,menu2,menu3,menu4;
JMenuItem itemNew,itemNewWindow,itemSave,itemSaveAs,itemPrinting,
itemPageSetup,itemCut,itemCopy,itemPaste,itemFind,itemReplace,itemOpen,
itemFontFormat,itemAbout,mouseCut,mouseCopy,mousePaste,mouseDelet,mouseAll;
JTextArea text1;
EditWindow(){
setTitle("简单文本编译器");
setSize(500,570);
setLocation(120,120);
setVisible(true);
/*
* 菜单栏设置：
* 1.文件
* ①新建
* ②新窗口
* ③打开
* ④保存
* ⑤另存为
* ⑥打印
* 2.编辑
* ①剪切
* ②复制
* ③粘贴
* ④查找
* ⑤替换
* 3.格式
* ①字体格式
*
* 4.帮助
* ①关于
*/
//文件菜单设置
menubar=new JMenuBar();
menu1=new JMenu("文件(F)");menu1.setMnemonic('F');
menu2=new JMenu("编辑(E)");menu2.setMnemonic('E');
menu3=new JMenu("格式(O)");menu3.setMnemonic('O');
menu4=new JMenu("帮助(H)");menu4.setMnemonic('H');
//文件
itemNew=new JMenuItem("新建(N) Ctrl+N");itemNewWindow=new JMenuItem("新窗口(W) Ctrl+W");
itemOpen=new JMenuItem("打开(O) Ctrl+O");itemSave=new JMenuItem("保存(S) Ctrl+S");
itemSaveAs=new JMenuItem("另存为(E) Ctrl+E");itemPrinting=new JMenuItem("打印(P) Ctrl+P");
itemNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));
itemNewWindow.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK));
itemOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));
itemSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
itemSaveAs.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, InputEvent.CTRL_MASK));
itemPrinting.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, InputEvent.CTRL_MASK));
menu1.add(itemNew);menu1.add(itemNewWindow);menu1.add(itemOpen);menu1.add(itemSave);
menu1.add(itemSaveAs);menu1.add(itemPrinting);
//编辑
itemCut=new JMenuItem("剪切(T) Ctrl+X");itemCopy=new JMenuItem("复制(C) Ctrl+C");
itemPaste=new JMenuItem("粘贴(V) Ctrl+V");itemFind=new JMenuItem("查找(F) Ctrl+F");
itemReplace=new JMenuItem("替换(R) Ctrl+R");
itemCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK));
itemCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK));
itemPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK));
itemFind.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_MASK));
itemReplace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, InputEvent.CTRL_MASK));
menu2.add(itemCut);menu2.add(itemCopy);menu2.add(itemPaste);
menu2.add(itemFind);menu2.add(itemReplace);
//格式
itemFontFormat=new JMenuItem("字体格式(F)");
menu3.add(itemFontFormat);
//帮助
itemAbout=new JMenuItem("关于(H)");
menu4.add(itemAbout);
menubar.add(menu1);menubar.add(menu2);
menubar.add(menu3);menubar.add(menu4);
setJMenuBar(menubar);
validate();
//设置监听器
itemNew.addActionListener(this);itemNewWindow.addActionListener(this);itemSave.addActionListener(this);
itemSaveAs.addActionListener(this);itemPrinting.addActionListener(this);itemOpen.addActionListener(this);
itemCut.addActionListener(this);itemCopy.addActionListener(this);itemPaste.addActionListener(this);
itemFind.addActionListener(this);itemReplace.addActionListener(this);
itemFontFormat.addActionListener(this);itemAbout.addActionListener(this);
//鼠标右击菜设置
mouseMenu=new JPopupMenu();
mouseCut=new JMenuItem("剪切");mouseCopy=new JMenuItem("复制");mousePaste=new JMenuItem("粘贴");
mouseDelet=new JMenuItem("删除");mouseAll=new JMenuItem("全选");
mouseMenu.add(mouseCut);mouseMenu.add(mouseCopy);mouseMenu.add(mousePaste);
mouseMenu.add(mouseDelet);mouseMenu.add(mouseAll);
//添加文本域
text1=new JTextArea();
//设置鼠标监听器
text1.addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent e) {
if(e.getModifiers()==InputEvent.BUTTON3_MASK)
mouseMenu.show(text1,e.getX(),e.getY());
}
});
mouseCut.addActionListener(this);mouseCopy.addActionListener(this);mousePaste.addActionListener(this);
mouseDelet.addActionListener(this);mouseAll.addActionListener(this);
//添加滚动条
JScrollPane scrollpane = new JScrollPane(text1);
scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
add(scrollpane, BorderLayout.CENTER);
//自动换行
text1.setLineWrap(true);
validate();
}
public void actionPerformed(ActionEvent e){
//
if(e.getSource()==itemNew) { //新建
text1.replaceRange("", 0, text1.getText().length());
}else if(e.getSource()==itemNewWindow) { //新窗口
EditWindow won=new EditWindow();
}else if(e.getSource()==itemOpen) { //打开
FileDialog openFile = new FileDialog(this, "打开文件", FileDialog.LOAD); //文件对话框
openFile.setVisible(true);
String filePath = openFile.getDirectory() + openFile.getFile();
try{
FileInputStream fis = new FileInputStream(filePath);
byte[] content = new byte[fis.available()];
fis.read(content);
text1.setText(new String(content));
text1.setCaretPosition(0);
if(openFile.getFile() != null){
this.setTitle(openFile.getFile());
}
fis.close();
}
catch(Exception ex){
ex.printStackTrace();
}
}else if(e.getSource() == itemSave) { //保存
int i = filechooser.showSaveDialog(EditWindow.this);
if (i == JFileChooser.APPROVE_OPTION) {
File f = filechooser.getSelectedFile();
try {
FileOutputStream out = new FileOutputStream(f);
out.write(text1.getText().getBytes());
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}else if(e.getSource() ==itemSaveAs) { //另存为
int i = filechooser.showSaveDialog(EditWindow.this);
if (i == JFileChooser.APPROVE_OPTION) {
File f = filechooser.getSelectedFile();
try {
FileOutputStream out = new FileOutputStream(f);
out.write(text1.getText().getBytes());
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}else if(e.getSource()==itemPrinting) { //打印
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}else if(e.getSource()==itemCopy || e.getSource()==mouseCopy) { //复制
text1.copy();
}else if(e.getSource()==itemCut || e.getSource()==mouseCut) { //剪切
text1.cut();
}else if(e.getSource()==itemPaste || e.getSource()==mousePaste) { //粘贴
text1.paste();
}else if(e.getSource()==mouseDelet) { //删除
text1.cut();
}else if(e.getSource()==mouseAll) { //全选
text1.selectAll();
}else if(e.getSource()==itemFind) { //查找
new win1();
}else if(e.getSource()==itemReplace) { //替换
new win2();
}else if(e.getSource()==itemFontFormat) { //字体格式
new win3();
}else if(e.getSource()==itemAbout) { //关于
JOptionPane.showMessageDialog(EditWindow.this, "Java学习组制作");
}
}
class win1 extends JFrame{
JButton button1;
JTextField textfile;
JLabel titlelName1;
win1(){
//setLayout(new FlowLayout());
setLayout(null);
setTitle("查找");
setBounds(100,100,300,200);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
textfile=new JTextField(20);
button1=new JButton("查找");
titlelName1=new JLabel("查找内容：");
textfile.setBounds(100,30,120, 25);
titlelName1.setBounds(15,30,70, 30);
button1.setBounds(120, 100, 60, 25);
add(textfile);
add(button1);
add(titlelName1);
setVisible(true);
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
Pattern p;
Matcher m;
String ch1,ch2;
ch1=textfile.getText();
ch2=text1.getText();
p=Pattern.compile(ch1);
m=p.matcher(ch2);
while(m.find()) {
text1.select(m.start(), m.end());
}
}
});
validate();
}
}
class win2 extends JFrame{
JButton button1;
JTextField textfile1,textfile2;
JLabel titlelName1,titlelName2;
win2(){
setLayout(null);
setTitle("替换");
setBounds(100,100,300,200);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
titlelName1=new JLabel("查找内容：");
titlelName2=new JLabel("替换为：");
textfile1=new JTextField(20);
textfile2=new JTextField(20);
button1=new JButton("替换");
textfile1.setBounds(100,30,120,25);
textfile2.setBounds(100,60,120,25);
titlelName1.setBounds(15,30,70, 30);
titlelName2.setBounds(15,60,70, 30);
button1.setBounds(120, 100, 60, 25);
add(titlelName1);
add(titlelName2);
add(textfile1);
add(textfile2);
add(button1);
setVisible(true);
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
Pattern p;
Matcher m;
String ch1,ch2,ch3;
ch1=textfile1.getText();
ch2=textfile2.getText();
ch3=text1.getText();
if(ch1==null) {
JOptionPane.showMessageDialog(EditWindow.this, "请输入查找内容!");
}else {
p=Pattern.compile(ch1);
m=p.matcher(ch3);
while(m.find()) {
text1.replaceRange(ch2, m.start(), m.end());;
}
}
}
});
validate();
}
}
class win3 extends JFrame implements ItemListener{
JComboBox listFont;
win3(){
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[]=ge.getAvailableFontFamilyNames();
listFont=new JComboBox(fontName);
JPanel pNorth=new JPanel(); //创建面板
pNorth.add(listFont); //添加列表
add(pNorth,BorderLayout.NORTH); //添加面板
listFont.addItemListener(this); //添加列表监视器
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setVisible(true);
setBounds(100,120,280,100);
}
public void itemStateChanged(ItemEvent e){
String name=(String)listFont.getSelectedItem();
Font f=new Font(name,Font.BOLD,32);
text1.setFont(f);
}
}
class win4 extends JFrame{
JButton button1,button2;
win4(){
setLayout(new FlowLayout());
setTitle("打印");
setBounds(100,100,300,100);
setVisible(true);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
button1=new JButton("打印");
button2=new JButton("打印预览");
add(button1);
add(button2);
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
try {
PrinterJob job = PrinterJob.getPrinterJob(); //创建打印对象
if (!job.printDialog()) { //取消打印
return;
}
//设置打印页面
job.setPrintable(new Printable() {
@Override
public int print(Graphics graphics, PageFormat pageFormat,int pageIndex) throws PrinterException {
// TODO Auto-generated method stub
if(pageIndex > 0) { //判断当前打印页的索引(判断打印的是否正确)
return Printable.NO_SUCH_PAGE; //超出打印页码
}
return Printable.PAGE_EXISTS; //页面可以打印
}
});
job.print(); //实现打印
} catch (PrinterException e1) {
e1.printStackTrace();
}
}
});
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(EditWindow.this, "该功能尚未开发!");
}
});
}
}
}