生手在干中学习JAVA，第一步，文本编辑器

新手在干中学习JAVA，第一步，文本编辑器！
总共两个类，一个程序主界面，一个测试类（包含main函数，实列化程序主界面类）

这个是程序主界面的类。
package study.com.notebook;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.StyleConstants;

class MainForm extends JFrame implements ActionListener, DocumentListener {
/**
 * 
 */
private static final long serialVersionUID = 1L;
// 界面元素变量
JMenuBar menuBar; // 菜单
JPanel panel;
JEditorPane textEdit;
JLabel statusLabel;

// 控制变量
boolean TextChangeNoSave; // 当前文档的改变是否已经保存
boolean DocIsNew; // 当前文档是否为新建

// 当前文件名次、路径
String filePath;
String fileName;

// 系统粘贴板
Clipboard clip;

public MainForm() {
// 界面初始化
InitGUI();
InitPara();
}

// 界面初始化
public void InitGUI() {
// 菜单栏初始化
menuBar = new JMenuBar();
menuBar.setBackground(Color.LIGHT_GRAY);
final JMenu[] menu = {new JMenu("File"),// "File"菜单
new JMenu("Edit"),// "Edit"菜单
new JMenu("Font"),//"Font"菜单
new JMenu("Help")// "Help"菜单
};

final JMenuItem[][] menuItem = {
{new JMenuItem("New"), new JMenuItem("Open"),
new JMenuItem("Save"), new JMenuItem("Exit")},
{new JMenuItem("Cut"), new JMenuItem("Copy"),
new JMenuItem("Paste")}, 
 
{},
{new JMenuItem("Help"), new JMenuItem("About")}};
for (int i = 0; i &lt; menu.length; i++) {
for (int j = 0; j &lt; menuItem[i].length; j++) 
{
menuItem[i][j].setBackground(Color.LIGHT_GRAY);
menu[i].add(menuItem[i][j]);
menuItem[i][j].addActionListener(this);
}
menuBar.add(menu[i]);
}
menu[0].add(new JSeparator(), 3); // 特定地方补分隔符
// 工具栏初始化

  JToolBar toolBar = new JToolBar(); 
  String[] toolButtonText =
  {"New","Open","Exit"}; 
  JButton[] toolButton = new JButton[toolButtonText.length]; 
  for(int i=0;i&lt;toolButtonText.length;i++)
  { 
  toolButton[i] = new JButton(toolButtonText[i]); 
  }
  for(int i=0;i&lt;toolButton.length;i++) 
  {
  toolButton[i].setActionCommand(toolButtonText[i]);
  toolButton[i].addActionListener(this); 
  toolBar.add(toolButton[i]);
  }

// 文本框

textEdit = new JEditorPane();

textEdit.setBackground(Color.DARK_GRAY);
textEdit.setForeground(Color.LIGHT_GRAY);

textEdit.getDocument().addDocumentListener(this);
// 为文本域添加滑动块
JScrollPane scrollPane = new JScrollPane(textEdit);

// 初始化状态栏
JToolBar statusBar = new JToolBar();
statusBar.setFloatable(false);
statusBar.setBackground(Color.LIGHT_GRAY);
statusLabel = new JLabel("  ");
statusBar.add(statusLabel);

// 初始化面板
panel = new JPanel();
panel.setLayout(new BorderLayout());
//panel.add(toolBar,BorderLayout.PAGE_START);
panel.add(scrollPane, BorderLayout.CENTER);
panel.add(statusBar, BorderLayout.PAGE_END);

this.add(panel);
this.setJMenuBar(menuBar);
this.setTitle("NoteBook");
this.setSize(640, 480);
this.setVisible(true);
}
// 参数初始化
public void InitPara() {
Toolkit toolkit = Toolkit.getDefaultToolkit();
clip = toolkit.getSystemClipboard();
TextChangeNoSave = false;
DocIsNew = true;
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
switch (e.getActionCommand()) {
// File菜单的事件响应
case "New" : 
 
newFile();
break;
case "Open" :
openFile();
break;
case "Save" :
saveFile();
break;
case "Exit" :
exit();
break;
// Edit菜单事件响应
case "Cut" :
cutText();
break;
case "Copy" :
copyText();
break;
case "Paste" :
pasteText();
break;

// Help菜单事件响应
case "Help" :
help();
break;
case "About" :
about();
break;
default :
break;
}
}

// ////菜单功能函数
public void newFile() {
if (TextChangeNoSave) {
int n = JOptionPane.showConfirmDialog(this, "文件已更改，是否保存?", "提示！",
JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {
saveFile();
}
}
textEdit.setText("");
statusLabel.setText("Created a new file");
DocIsNew = true;
TextChangeNoSave = true;
filePath = null;
fileName = null;
}
public void openFile() {
if (TextChangeNoSave) {
int n = JOptionPane.showConfirmDialog(this, "文件已更改，是否保存?", "提示！",
JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {
saveFile();
}

}
FileDialog openFileDlg = new FileDialog(this, "打开文件", FileDialog.LOAD);
openFileDlg.setVisible(true);
filePath = openFileDlg.getDirectory();
fileName = openFileDlg.getFile();
ReadFile();
TextChangeNoSave = false;
DocIsNew = false;

}
public void saveFile() {
if (DocIsNew) {
FileDialog saveFileDlg = new FileDialog(this, "保存文件",
FileDialog.SAVE);
saveFileDlg.setVisible(true);
filePath = saveFileDlg.getDirectory();
fileName = saveFileDlg.getFile();
}
WriteFile();
}
public void exit() {
if (TextChangeNoSave) {
int n = JOptionPane.showConfirmDialog(this, "文件已更改，是否保存?", "提示！",
JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {
saveFile();
}
}
System.exit(0);
}
public void cutText() {
textEdit.cut();
}
public void copyText() {
textEdit.copy();
}
public void pasteText() {
Transferable contents = clip.getContents(this); 
 
if (contents != null
&& contents.isDataFlavorSupported(DataFlavor.stringFlavor)) {
try {
String str = (String) contents
.getTransferData(DataFlavor.stringFlavor);
int pos = textEdit.getSelectionStart();
textEdit.cut();
textEdit.insert(str, pos);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
public void help() {
//File dir = new File("..");
//filePath = dir.getAbsolutePath();
fileName = "readme.txt";
ReadFile();
}
public void about() {
String info = "作者 ：nudt_tony \n" + "日期 ：2013 06 28\n"
+ "邮箱 ：basic8@163.com";
JOptionPane.showMessageDialog(this, info);
}
// /底层文件读写函数
public void WriteFile() {
if (fileName != null) {
try {
File file1 = new File(filePath, fileName);
FileWriter fw = new FileWriter(file1);
BufferedWriter out = new BufferedWriter(fw);
out.write(textEdit.getText());
out.close();
fw.close();
statusLabel.setText("文件保存成功!");
} catch (IOException e) {
statusLabel.setText("文件保存出错！");
}
}
}

public void ReadFile() {
if (fileName != null) {
try {
File file1 = new File(filePath, fileName);
FileReader fr = new FileReader(file1);
BufferedReader in = new BufferedReader(fr);
StringBuilder text = new StringBuilder();
String str="";
while ((str = in.readLine()) != null)
{
text.append(str+ "\r\n");
}
textEdit.setText(text.toString());
in.close();
fr.close();
statusLabel.setText(filePath + fileName);

} catch (IOException e) {
statusLabel.setText("打开文件出错！");
}
}
}

@Override
public void insertUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
// statusLabel.setText("Text Changed!!");
TextChangeNoSave = true;
statusLabel.setText("Text insertUpdate!");
}
@Override
public void removeUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
TextChangeNoSave = true;
statusLabel.setText("Text removeUpdate!!"); 
 
}
@Override
public void changedUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
TextChangeNoSave = true;
statusLabel.setText("Text changedUpdate!!");
}
}
这个是测试类
生手在干中学习JAVA第一步文本编辑

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