Having trouble writing to a file

[Fozzi]

Hey all

I have been working on a project which allows me to write to a file and retrieve from that file, but i having trouble with it

These are my inputs:
private int flightno;
private int sourceairportcode;
private int destinationaiportcode;
private String takeofftime;
private String landingtime;

These are variables at the top declared
ObjectOutputStream output;
ObjectInputStream input;

i have this in my code

File file = new File(System.getProperty("user.dir") + "/data/flights.txt");
(not sure if this is the problem maybe its not writing to the correct place, i have created the data folder with an empty flights.txt file in it)


and here is what aint working

private void btnaddMousePressed(java.awt.event.MouseEvent evt) {
FlightRecord record;

try{

record = new FlightRecord(

Integer.parseInt(txtflightno.getText()),

Integer.parseInt(txtsource.getText()),

Integer.parseInt(txtdestination.getText()),

txttakeoff.getText(),

txtlanding.getText());

output.writeObject(record);

}

catch (Exception e){
JOptionPane.showMessageDialog(this, "Something wrong!", "Error",JOptionPane.ERROR_MESSAGE );
}


Any help would be great.

[Nepomuk]

Are you using Windows? If so, one mistake (maybe not the only, but certainly one, which would cause problems) is here:

File file = new File(System.getProperty("user.dir") + "/data/flights.txt");

The File seperator under Windows is \ (System.getProperty("file.separator") or File.seperator). You should use those two anyway, to provide independency from the OS.
If you don't want to use either of those, use:

File file = new File(System.getProperty("user.dir") + "\\data\\flights.txt");

[r035198x]

1.) Please use code tags when posting code
2.) I'm not sure I get the exact problem you're getting but this might help.

[Fozzi]

Hmm messed about with the file seperator stuff didnt seem to change anything, got to be a problem somewhere else.

[r035198x]

Hmm messed about with the file seperator stuff didnt seem to change anything, got to be a problem somewhere else.

Could you post the full stacktrace or error message that you're getting?

[Fozzi]

Im using netbeans to do it, and the try and catch blocks just say somethings wrong when i try and add the info to the file,. not sure where i can find the full error message report

[r035198x]

Im using netbeans to do it, and the try and catch blocks just say somethings wrong when i try and add the info to the file,. not sure where i can find the full error message report

In the catch block just put

e.printStackTrace();

replace e with your exception variable name and then watch the console window when running it to see the fireworks.

[Fozzi]

think its something to do with the directopry of the file its being saved to

File file = new File(System.getProperty("user.dir") + "\\data\\flights.txt");

my flights file is premade and is in

C:\Documents and Settings\Fozzi\assignment7\data\flights.txt

is that the correct path? maybe i need to add something extra

[r035198x]

think its something to do with the directopry of the file its being saved to

File file = new File(System.getProperty("user.dir") + "\\data\\flights.txt");

my flights file is premade and is in

C:\Documents and Settings\Fozzi\assignment7\data\flights.txt

is that the correct path? maybe i need to add something extra

What's your current working directory?
You can also print the value of
System.getProperty("user.dir") + "\\data\\flights.txt" to the console to see if it's path you intended.

[Fozzi]

My current working directory is

C:\Documents and Settings\Fozzi\assignment7

assignment 7 being the main project folder that i am working from there are several folders within and i created the data folder with the txt file in it, in assignment 7

[r035198x]

My current working directory is

C:\Documents and Settings\Fozzi\assignment7

assignment 7 being the main project folder that i am working from there are several folders within and i created the data folder with the txt file in it, in assignment 7

And what was printed out when you tried what I suggested above.
Another thing is that you haven't told us the exact exception/ error message that you're getting.

[JosAH]

I'm still interested in what that Exception e has to say.

kind regards,

Jos

[Nepomuk]

You can check, if the File you gave exists by using:

File file = new File(System.getProperty("user.dir") + "\\data\\flights.txt");
if(file.exists()) System.out.println("It's there!");
else System.out.println("It's not there!");

Nevertheless, if this doesn't help, please do post the Stack Trace! ^^