Overwriting a text file in Java

Question

The application should be able to register a new user and save data to text file which is already has many users' data. This code is works but it doesn't save new data to text file. How should I overwrite the text file? Should I read data from text first and write all the data back to text file or there is a way to just add a new line and write new data there?

registerB.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent e){
                            String getFullname = fullnameT.getText();
                            String getUsername = usernameT.getText();
                            String getPassword = passwordT.getText();
                            String getPN = pnT.getText();
                            String getEmail = emailT.getText();
                            boolean theSame = false;
                            String []Fullname = new String[20];
                            String []Username = new String[20];
                            String []Password = new String[20];
                            String []PN = new String[20];
                            String []Email = new String[20];

            if(!getFullname.isEmpty() && !getUsername.isEmpty() && !getPassword.isEmpty() && !getPN.isEmpty() && !getEmail.isEmpty()){
                int k = 0;
                try {
                    Scanner in = new Scanner (new FileReader("login.txt", true));
                    while (in.hasNext()) {
                        Fullname[k] = in.next();
                        Username[k] = in.next();
                        Password[k] = in.next();
                        PN[k] = in.next();
                        Email[k] = in.next();
                        in.next();

                        if(getUsername.equals(Username[k])){
                            JOptionPane.showMessageDialog(null, "Username already has been registered.");
                            theSame = true;
                            break;
                        }
                        k++;
                    }
                }catch(Exception ew){}
                try
                {
                    String path = "login.txt";

                    File file = new File(path);

                    FileWriter fileWriter = new FileWriter(file,true);

                    BufferedWriter bufferFileWriter  = new BufferedWriter(fileWriter);

                    fileWriter.append("," + getFullname + "," + getUsername + "," + getPassword + "," + getPN + "," + getEmail +"," + "\n");

                    bufferFileWriter.close();

                    System.out.println("User Registration Completed");

                }catch(Exception ex){
                    System.out.println(ex);
                }
            else{
                JOptionPane.showMessageDialog(null, "One or some of the fields is/are empty");
            }
        }
    });

The text file format is like this

fullname,username,password,phonenumber,email fullname,username,password,phonenumber,email

possible duplicate of [How to append text to an existing file in Java](http://stackoverflow.com/questions/1625234/how-to-append-text-to-an-existing-file-in-java) — Jonathan Drapeau, Aug 28 '14 at 18:05

SparkOn · Accepted Answer · 2014-08-28T18:10:28.383

0

This is wrong new FileReader("login.txt", true)

FileReader does have this constructor

Change new FileWriter("login.text") to new FileWriter("login.text", true)

the true will append the new data to the existing data

edited Aug 28 '14 at 18:10

answered Aug 28 '14 at 18:04

SparkOn

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I saw it that I didnt include FileWriter. Thnx for ur help – user3053089 Aug 28 '14 at 18:21

Overwriting a text file in Java

1 Answers1