作为一个小小的项目,我认为制作文本编辑器会很酷。我目前只是打开文件了。这是我打开文件的代码(e
是ActionEvent
,打开是JMenuItem
):
else if (e.getSource() == open) {
JFileChooser choice = new JFileChooser();
int option = choice.showOpenDialog(this);
if (option == JFileChooser.APPROVE_OPTION) {
try{
Scanner scan = new Scanner(new FileReader((open).getSelectedFile().getPath()));
}
}
}
试块给我带来了麻烦。 Eclipse称getSelectedFile()
未定义类型JMenuItem
。对于MenuItem
来说,它似乎也未定义。有没有其他方法可以解决这个问题,还是另一种方法可以解决这个问题?
答案 0 :(得分:9)
一旦返回,您需要在JFileChooser
上致电getSelectedFile()
,因此请将代码更改为:
choice.getSelectedFile()
答案 1 :(得分:3)
private void selectfileActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser jFileChooser=new JFileChooser();
StringBuffer buffer;
buffer = new StringBuffer();
int result= jFileChooser.showOpenDialog(this);
if(result==JFileChooser.APPROVE_OPTION)
{
try {
FileReader reader;
reader = null;
JOptionPane.showMessageDialog(this,"hii user clicked open sysytem");
File file=jFileChooser.getSelectedFile();
reader=new FileReader(file);
int i=1;
while(i!=-1)
{
i=reader.read();
char ch=(char) i;
buffer.append(ch);
}
notepad.setText(buffer.toString());
} catch (FileNotFoundException ex) {
Logger.getLogger(MainForm.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(MainForm.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
答案 2 :(得分:0)
import java.awt.EventQueue;
public class FileChooser extends JFrame
{
private JPanel contentPane;
String filename;
// main
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
FileChooser frame = new FileChooser();
frame.setVisible(true);
} catch (Exception e)
{
e.printStackTrace();
}
}
});
}
public FileChooser()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
// button to selct file
JButton btnNewButton = new JButton("Select file");
btnNewButton.setBounds(10, 2, 89, 23);
contentPane.add(btnNewButton);
// area to display file content
final JTextArea textArea = new JTextArea();
textArea.setBounds(10, 36, 414, 215);
contentPane.add(textArea);
// save button
final JButton btnSave = new JButton("Save");
btnSave.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
try
{
FileWriter writer = new FileWriter(filename.replace(".",
"_out."));
BufferedWriter bwr = new BufferedWriter(writer);
bwr.write(textArea.getText());
bwr.close();
writer.close();
System.out.println(textArea.getText());
} catch (Exception e)
{
System.out.println("Error");
}
}
});
btnSave.setBounds(283, 2, 89, 23);
contentPane.add(btnSave);
// listen to button clicks
btnNewButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
JFileChooser fileChooser = new JFileChooser();
int returnValue = fileChooser.showOpenDialog(null);
if (returnValue == JFileChooser.APPROVE_OPTION)
{
File selectedFile = fileChooser.getSelectedFile();
filename = selectedFile.getAbsolutePath();
try
{
FileReader reader = new FileReader(filename);
BufferedReader br = new BufferedReader(reader);
textArea.read(br, null);
br.close();
System.out.println(textArea.getText());
} catch (Exception e)
{
System.out.println("Error");
}enter code here
}
}
enter code here
});
}
}