How can I add new information to a .txt file without it removing any old data in java

Question

I want to store all the sales in a txt file, but every time I enter new information it deletes the old information. Any idea why?

try {
    BufferedWriter bfw = new BufferedWriter(new FileWriter(file1));
    BufferedWriter bfw1 = new BufferedWriter(new FileWriter(file2));

    bfw.write(Total.getText());
    bfw.newLine();

    String timeStamp = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss").format(new java.util.Date());
    bfw1.write(timeStamp);
    bfw1.newLine();

    bfw.close();
    bfw1.close();
} catch (IOException ex) {
    Logger.getLogger(FrmFacturas.class.getName()).log(Level.SEVERE, null, ex);
}

score 1 · Accepted Answer · answered Oct 21 '20 at 21:33

1

You can put a second parameter to the FileWriter constructor:

BufferedWriter bfw = new BufferedWriter(new FileWriter(file1, true));

OR

you could use Files.nio:

Files.writeString(file1.toPath(), textToWrite, StandardOpenOption.APPEND)

answered Oct 21 '20 at 21:33

Hias

57
3

I Tried this File t = new File(file1); Files.writeString(t.toPath(), Total.getText(), StandardOpenOption.APPEND); but didnt work im getting an error in writeString – Blober Oct 21 '20 at 21:44
which error did you get? – Hias Oct 22 '20 at 11:25
It worked, with the fileriter, Than you! – Blober Oct 22 '20 at 17:26
can u pls set this as accepted answer then? :-) – Hias Nov 02 '20 at 12:04

score 0 · Answer 2 · answered Oct 21 '20 at 21:33

0

You have to open the file in append mode to do this add true as the second parameter in FileWriter

BufferedWriter bfw = new BufferedWriter(new FileWriter(file1,true));

answered Oct 21 '20 at 21:33

DarrenChand

116
13

Thank you, I tried this but It didnt work – Blober Oct 21 '20 at 21:43
seems like you wish to append the timestamp try using this code String textToAppend = "yourtimestamp"; //Set true for append mode BufferedWriter writer = new BufferedWriter( new FileWriter("c:/temp/samplefile.txt", true)); writer.write(textToAppend); writer.close(); – DarrenChand Oct 21 '20 at 21:49

How can I add new information to a .txt file without it removing any old data in java

2 Answers2