用\\ n替换方块

Question

I have a method to get text from a JTextArea and save in a txt file. It all works fine but text is saved in a straight line with little empty squares instead of \\n. I would like to replace these squares with \\n

My code is:

public void createTxt(){

TxtFilter txt = new TxtFilter();

JFileChooser fSave = new JFileChooser();

fSave.setFileFilter(txt);
int result = fSave.showSaveDialog(this);
if(result == JFileChooser.APPROVE_OPTION){
    File sFile = new File(fSave.getSelectedFile()+ ".txt");

    String file_name = sFile.getName();
    String file_path = sFile.getParent();

    try{
         if(!sFile.exists()){

            BufferedWriter out = new BufferedWriter(new FileWriter(sFile));

            FileReader fr = new FileReader(jTextArea1.getText());
            BufferedReader br = new BufferedReader(fr);

            String line = "";

            while((line = br.readLine())!= null){
            line = line.replace("o", "\n");
            out.write(line);
            }
            out.close();

            JOptionPane.showMessageDialog(null, "Warning file • " + file_name + " • created succesfully in \n" + file_path);    
        }

        else{

There must be something wrong because it creates the txt file but it is always empy, no text is get from JTextArea and I always have Exception as from

catch(IOException e){
       System.out.println("Error");
   }

Where is the error? How to modify the code?

PS I have wrote 'o' instead of empty square because I do not know what to write as first string (or char) to be replaced.

Thanks

Added:PrintStackTrace

java.io.FileNotFoundException: sdfdsf (Impossibile trovare il file specificato)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileInputStream.<init>(FileInputStream.java:66)
at java.io.FileReader.<init>(FileReader.java:41)
at provegrafica.ProvaFramePop.createTxt(ProvaFramePop.java:154)
at provegrafica.ProvaFramePop.jMenuSaveActionPerformed(ProvaFramePop.java:129)
at provegrafica.ProvaFramePop.access$100(ProvaFramePop.java:17)
at provegrafica.ProvaFramePop$2.actionPerformed(ProvaFramePop.java:64)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
at java.awt.Component.processMouseEvent(Component.java:6289)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6054)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4652)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:617)
at java.awt.EventQueue$2.run(EventQueue.java:615)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

BUILD SUCCESSFUL (total time: 19 seconds)

Added: Else part of the code

else{
            String message = "File • " + file_name + " • already exist in \n" + file_path + ":\n" + "Do you want to overwrite?";
            String title = "Warning";
            int reply = JOptionPane.showConfirmDialog(null, message, title, JOptionPane.YES_NO_OPTION);
            if(reply == JOptionPane.YES_OPTION){
                sFile.delete();

                BufferedWriter out = new BufferedWriter(new FileWriter(sFile));
                out.write(jTextArea1.getText());
                out.close();
                JOptionPane.showMessageDialog(null, "File • " + file_name + " • overwritten succesfully in \n" + file_path);

            }
        }

Answer 1

Don't reinvent the wheel.

All text components support a write(...) method. This method will use the proper newline string when the text is written to the file. So all you do is:

textArea.write(...);

Answer 2

Those are \\n's. You are opening in Notepad.

You either need to print out a \\r before each \\n (which here can be done simply by using a buffered writer which has a printLine method), or open in eg Wordpad.

Answer 3

replace

line = line.replace("o", "\n");

with

line = line.replaceAll("o", System.getProperty("line.separator"));

Answer 4

What are you doing in else part your program is not able to find the specified file.

your condition in if says

if(!sFile.exists()){ // don't use not here
// code to write into the file
}

where as it should be

if(sFile.exists()){
// code to write into the file
}

Use following to write to the file

while((line = br.readLine())!= null){
        out.append(line); //can also use write in place of append
        out.append("\r\n");
        }
        out.close();