Java小作业,任务是写一个有改字体颜色大小的文本编辑器。其实相比windows自带的记事本功能还要弱,不过还是拿来练练手了。这里主要也就实现了简单的文件读写和字体等更改操作,还是非常简易的。
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
public class TextEditer extends JFrame {
private static final long serialVersionUID = 1L;
private JScrollPane scrollPane;
public JTextArea textArea;
private JMenuBar menubar;
private TextEditer editer;
public Font font;
private Color fgColor, bgColor;
private JMenu menuFile, menuEdit;
private JMenuItem menuFileNew, menuFileOpen, menuFileSave, menuFileExit;
private JMenuItem menuEditFont, menuEditFgColor, menuEditBgColor;
public TextEditer() {
setDefault();
setMenubar();
setListener();
}
private void setDefault() {
editer = this;
this.setBounds(100, 100, 100, 100);
this.setSize(720, 540);
this.setLocationRelativeTo(null);// 居中
this.setTitle("文本编辑器");
font = new Font("宋体", Font.PLAIN, 28);
textArea = new JTextArea();
textArea.setFont(font);
fgColor = new Color(0, 0, 0);
bgColor = new Color(255, 255, 255);
textArea.setForeground(fgColor);
textArea.setBackground(bgColor);
textArea.setLineWrap(true);// 超出边界自动换行
scrollPane = new JScrollPane(textArea);// 加入滚动条
this.add(scrollPane);
}
private void setMenubar() {
menubar = new JMenuBar();
menuFile = new JMenu("文件(F)");
menuEdit = new JMenu("编辑(E)");
menubar.add(menuFile);
menubar.add(menuEdit);
menuFileNew = new JMenuItem("新建(N)");
menuFileOpen = new JMenuItem("打开(O)");
menuFileSave = new JMenuItem("保存(S)");
menuFileExit = new JMenuItem("退出(X)");
menuFile.add(menuFileNew);
menuFile.add(menuFileOpen);
menuFile.add(menuFileSave);
menuFile.add(menuFileExit);
// 设置alt+X快捷键
menuFile.setMnemonic('F');
menuFileNew.setMnemonic('N');
menuFileOpen.setMnemonic('O');
menuFileSave.setMnemonic('S');
menuFileExit.setMnemonic('X');
// 设置ctrl+X快捷键
menuFileNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));
menuFileOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));
menuFileSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
menuEditFont = new JMenuItem("字体(T)");
menuEditFgColor = new JMenuItem("前景色(F)");
menuEditBgColor = new JMenuItem("背景色(B)");
menuEdit.add(menuEditFont);
menuEdit.add(menuEditFgColor);
menuEdit.add(menuEditBgColor);
menuEdit.setMnemonic('E');
menuEditFont.setMnemonic('T');
menuEditFgColor.setMnemonic('F');
menuEditBgColor.setMnemonic('B');
this.setJMenuBar(menubar);
}
private void setListener() {
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 设置文本字体,调用之前写的FontChooser类
menuEditFont.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
FontChooser.showDialog(editer, "选择字体", true, textArea.getFont());
textArea.setFont(FontChooser.getResFont());
}
});
// 设置文本前景色
menuEditFgColor.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Color color = JColorChooser.showDialog(editer, "选择前景色", textArea.getForeground());
textArea.setForeground(color);
}
});
// 设置文本背景色
menuEditBgColor.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Color color = JColorChooser.showDialog(editer, "选择背景色", textArea.getBackground());
textArea.setBackground(color);
}
});
// 清空文本区
menuFileNew.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
textArea.setText("");
}
});
// 选择打开文件
menuFileOpen.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(editer);
File file = chooser.getSelectedFile();
if (file == null)
return;
BufferedReader reader;
try {
reader = new BufferedReader(new FileReader(file));
String line = "";
String ans = "";
while ((line = reader.readLine()) != null) {
ans += line;
}
textArea.setText(ans);
reader.close();
} catch (IOException e1) {
System.out.println("File open failure.");
e1.printStackTrace();
}
}
});
// 保存文件
menuFileSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(editer);
File file = chooser.getSelectedFile();
if (file == null)
return;
FileWriter writer;
try {
writer = new FileWriter(file);
writer.write(textArea.getText());
writer.flush();
writer.close();
} catch (IOException e1) {
System.out.println("File open failure.");
e1.printStackTrace();
}
}
});
// 退出
menuFileExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
}
public static void main(String[] args) {
TextEditer editer = new TextEditer();
editer.setVisible(true);
}
}