如何使用JFileChooser保存file.txt？

Question

I am developing notepad project, would like know how do for save a file.txt, my problem is, I keep the file opening JFileChooser, after selected the local where save intend, but after if save again will open JFileChoose again. I want save. Not save as.

  JFileChooser fc = new JFileChooser();

    int resp = fc.showSaveDialog(fc);

    if (resp == JFileChooser.APPROVE_OPTION) {
        PrintStream fileOut = null;
        try {

            File file = fc.getSelectedFile();

            fileOut = new PrintStream(file);

            fileOut.print(txtArea.getText());
        } catch (FileNotFoundException ex) {
            Logger.getLogger(frmNotePad.class.getName()).log(Level.SEVERE, null, ex);
        } finally {

            fileOut.close();
        }

Answer 1

如果您想要另存为另存为，请让程序存储一个File对象，该对象引用当前打开的文件的路径，以便该程序始终知道其正在编辑的内容，然后只需将其写入文件中即可

Answer 2

Change you work flow.

Basically, when you first save the file, you need to keep a reference to the File to which you saved to...

public class ... {
   private File currentFile;

Now, when you go to save the file, you need to check if the currentFile is null or not. It it is null , you ask the user to select a file, otherwise, you can go ahead and try and save the file...

if (currentFile == null) {

    JFileChooser fc = new JFileChooser();
    int resp = fc.showSaveDialog(fc);

    if (resp == JFileChooser.APPROVE_OPTION) {
        currentFile = fc.getSelectedFile();
    }

}

// Used to make sure that the user didn't cancel the JFileChooser
if (currentFile != null) {
    PrintStream fileOut = null;
    try {
        fileOut = new PrintStream(file);
        fileOut.print(txtArea.getText());
    } catch (IOException ex) {
        Logger.getLogger(frmNotePad.class.getName()).log(Level.SEVERE, null, ex);
    } finally {
        try {
            fileOut.close();
        } catch (IOException exp) {
        }
    }