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Thread: Problem with FileWriter

  1. #1
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    Default Problem with FileWriter

    Hello i have a question about my code : I'm trying to write a code which would read from command line and then it would create file nd write the input inside:

                if(input.startsWith("add"))
                {
                    // Call the add method and pass a string array as argument which does not
                    // include "add" and has split the remaining arguments by whitespace.
                    System.out.println("In order to create new file: Write the date,time,hour, header and comment");
                    Scanner scanner = new Scanner(System.in);
                    Date date = new Date();
                    String date2 = scanner.nextLine();
     
                    SimpleDateFormat formatDate = new SimpleDateFormat("dd.mm.yyyy");
                    String date_to_string = formatDate.format(date);
                    System.out.println("Date is" + date_to_string);
     
                  //  String date = scanner.toString();
                    String time = scanner.toString();
                    Integer duration = scanner.nextInt();
                    String dur = Integer.toString(duration);
                    String header = scanner.toString();
                    String comment = scanner.toString();
     
                    add(new String[]{date2,time,dur,header,comment});
     
      //              add(input.substring(4).split("\\s+"));
                    continue;
                }
    After the variables have been written, they should be added to a file
     private void add(String[] tokens) throws IOException {
     
            System.out.println("file : ");
     
            if(tokens.length < 5)
            {
                System.out.println("Illegal arguments");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            // TODO Check data validity and formating
            SimpleDateFormat df = new SimpleDateFormat("dd.mm.yyyy HH:mm");
            Date date = null;
            try {
                date = df.parse(tokens[0] + " " + tokens[1]);
            } catch (ParseException e){
                System.out.println("Error parsing date/time!");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            int duration = Integer.parseInt(tokens[2]);
            String header = tokens[3];
            String comment = tokens[4];
     
     
            // ToDo: Write the new date to a file in the directory "events" and send it to the other devices...
     
            File eventF = new File("D:\\Uni.lu\\events\\id.event.txt");
            try{
                if(!eventF.exists()){
                    eventF.createNewFile();
                    System.out.println("New file " + eventF.getName() + "was created");
     
                    System.out.println("New file " + eventF.getName() + "was created");
                }
            }catch (IOException e){
                e.printStackTrace();
            }
     
    //
    //        try{
    //            File file = new File("D:\\Uni.lu\\events\\id.event.txt");
    //            FileWriter fileWriter = new FileWriter(file);
    //            BufferedWriter out = new BufferedWriter(fileWriter);
    //            out.write(date.toString());
    //            out.write(duration);
    //            out.write(header);
    //            out.write(comment);
    //            out.close();
    //            out.flush();
    //        }catch(Exception e){
    //            System.err.println("Error: " +e.getMessage());
    //        }
    //
     
        }
    My problem is that the file doesnt wants to be created And I dont know why. I have tried with simple piece of code to create file and with FileWriter since I want to write the variables into it.

    Thank you for your help


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with FileWriter

    problem is that the file doesnt wants to be created
    If you are getting an error message, copy the full text of the error message and paste it here.
    Otherwise please explain what "doesn't want to create" means.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Problem with FileWriter

    thats the problem,i don't get any error messages that's why I'm so confused

    --- Update ---

    Well, i found that there is sth wrong with th scanner. I tried to print out the input but it doesnt work

  4. #4
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    Default Re: Problem with FileWriter

    it doesnt work
    Please explain what that means.

    --- Update ---

    Can you post the code that uses FileWriter and that doesn't work? The posted code has commented out the section that uses FileWriter.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Problem with FileWriter

    here is the code with FileWriter

            private void add(String[] tokens) throws IOException {
     
            System.out.println("file : ");
     
            if(tokens.length < 5)
            {
                System.out.println("Illegal arguments");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            // TODO Check data validity and formating
            SimpleDateFormat df = new SimpleDateFormat("dd.mm.yyyy HH:mm");
            Date date = null;
            try {
                date = df.parse(tokens[0] + " " + tokens[1]);
            } catch (ParseException e){
                System.out.println("Error parsing date/time!");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            int duration = Integer.parseInt(tokens[2]);
            String header = tokens[3];
            String comment = tokens[4];
     
            try{
                File file = new File("D:\\Uni.lu\\events\\id.event.txt");
                FileWriter fileWriter = new FileWriter(file);
                BufferedWriter out = new BufferedWriter(fileWriter);
                out.write(date.toString());
                out.write(duration);
                out.write(header);
                out.write(comment);
                out.close();
                out.flush();
            }catch(Exception e){
                System.err.println("Error: " +e.getMessage());
            }
     
     
        }


    --- Update ---

    When I try to print out the input with System.out.println() it simply doesnt do anything it looks like that the scanner doesnt do anytthing

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Problem with FileWriter

    it simply doesnt do anything
    Which println() are you talking about? What variable has the input that you are trying to print? I don't see anything that you are talking about in post#5.

    Can you copy the full contents of the console from when you execute the program and post it here?

    Can you make a small, complete program that compiles, executes and shows the problem? The small bits of code you have posted don't show enough.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Problem with FileWriter

     if(input.startsWith("add"))
                {
                    // Call the add method and pass a string array as argument which does not
                    // include "add" and has split the remaining arguments by whitespace.
                    System.out.println("In order to create new file: Write the date,time,hour, header and comment");
                    Scanner scanner = new Scanner(System.in);
                    Date date = new Date();
                    String date2 = scanner.nextLine();
     
                    SimpleDateFormat formatDate = new SimpleDateFormat("dd.mm.yyyy");
                    String date_to_string = formatDate.format(date);
                    System.out.println("Date is" + date_to_string);
     
                  //  String date = scanner.toString();
                    String time = scanner.nextLine();
                    Integer duration = scanner.nextInt();
                    String dur = Integer.toString(duration);
                    String header = scanner.nextLine();
                    String comment = scanner.nextLine();
     
                    System.out.println(date2);
                    System.out.println(time);
                    System.out.println(dur);
                    System.out.println(header);
                    System.out.println(comment);
     
    //                add(new String[]{date2,time,dur,header,comment});
     
                    add(input.substring(4).split("\\s+"));
                    continue;
                }
    I'm talking about these prints. Where I try to print out the input..

    my console shows this when I compile it:

    EventManager started
    If you need help please type help
    >
    add
    In order to create new file: Write the date,time,hour, header and comment
    14.03.2012 14:00 30 header comment
    Date is29.25.2013
    here is th main function which checks if the input is correct and is responsible for creating a File and storing all the input inside the file

     private void add(String[] tokens) throws IOException {
     
            System.out.println("file : ");
     
            if(tokens.length < 5)
            {
                System.out.println("Illegal arguments");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            // TODO Check data validity and formating
            SimpleDateFormat df = new SimpleDateFormat("dd.mm.yyyy HH:mm");
            Date date = null;
            try {
                date = df.parse(tokens[0] + " " + tokens[1]);
            } catch (ParseException e){
                System.out.println("Error parsing date/time!");
                System.out.println("add [date] [time] [duration] [header] [comment] "+
                        "--> add a new event with the given arguments; date format: "+
                        "dd.mm.yyyy; time format: hh:mm; duration in minutes");
                System.out.println();
                return;
            }
            int duration = Integer.parseInt(tokens[2]);
            String header = tokens[3];
            String comment = tokens[4];
     
     
            // ToDo: Write the new date to a file in the directory "events" and send it to the other devices...
     
            System.out.println("aaaa");
    //        try{
    //            if(!eventF.exists()){
    //                eventF.createNewFile();
    //                System.out.println("New file " + eventF.getName() + "was created");
    //
    //                System.out.println("New file " + eventF.getName() + "was created");
    //            }
    //        }catch (IOException e){
    //            e.printStackTrace();
    //        }
     
     
            try{
                File file = new File("D:\\Uni.lu\\events\\id.event.txt");
                FileWriter fileWriter = new FileWriter(file);
                BufferedWriter out = new BufferedWriter(fileWriter);
                out.write(date.toString());
                out.write(duration);
                out.write(header);
                out.write(comment);
                out.close();
                out.flush();
            }catch(Exception e){
                System.err.println("Error: " +e.getMessage());
            }
     
     
        }

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Problem with FileWriter

    Can you post a SMALL, COMPLETE program that will compile, execute and show the problem?

       System.out.println("date2="+date2); // add a String so you can see it this executed
    If date2 = "" you will only see a blank line. With a String you will know.

    --- Update ---

    When I execute this version of the posted code:
           try{
                File file = new File("event.txt");
                FileWriter fileWriter = new FileWriter(file);
                BufferedWriter out = new BufferedWriter(fileWriter);
                out.write("date.toString()");
                out.write("duration");
                out.write("header");
                out.write("comment");
                out.close();
                out.flush();          // <<< IOException: Stream closed
            }catch(Exception e){
                System.err.println("Error: " +e.getMessage());
                e.printStackTrace();
            }

    I get the noted error and this in the event.txt file:
    date.toString()durationheadercomment
    If you don't understand my answer, don't ignore it, ask a question.

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