Writing in file that already exists - but i have a issue

Question

I have a code that should write lines in File.. - If file don't exist, it should make new file with that name. - If file exist, it should just write new line...

It appears that it always make new file and i cant figure out how to avoid it... Here is my code...

How to make it just to write new line if file is already there?

Thx for ur time...

if (isANumber(value) == true) {
    String valResult = "validation_result=VALID";
    BufferedWriter writer = null;
    writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("ValidationResults.txt")));
    System.out.println("Writing in TEXT file: " + "type=" + key + ";value=" +  value + ";" + valResult);
    writer.newLine();
    writer.write("\ntype=" + key + ";value=" +  value +  valResult + "\n");
    writer.flush();
    writer.close();
} else {
    valResult = "validation_result=INVALID";
    BufferedWriter writer =  new BufferedWriter(new OutputStreamWriter(new FileOutputStream("ValidationResults.txt")));
    System.out.println("Writing in TEXT file: " + "type=" + key + ";value=" +  value + ";" +  valResult);
    writer.newLine();
    writer.write("\ntype=" + key + ";value=" +  value + ";" + valResult + "\n");
    writer.flush();
    writer.close();
}

It will be a good idea to add the language and platform tags to this question. — Abizern, Jul 04 '13 at 10:31
What language do you use? What is the target OS or device? Put this information in question tags to attract more experts. — Artemix, Jul 04 '13 at 10:31
possible duplicate of [How to write data with FileOutputStream without losing old data?](http://stackoverflow.com/questions/8544771/how-to-write-data-with-fileoutputstream-without-losing-old-data) — Mat, Jul 04 '13 at 10:32
You have almost the same code in the two blocks. You can factor this out. The only difference is the value for `valResult`. In addition, whenever you see or think of writing `(x == true)` remember that this will be the same as `x` for any boolean expression `x`. Thus, if `x` is a boolean expression, then the following will all be the same: `x==true`, `(x==true)==true`, `((x==true)==true)==true`. Is it true that it is the case that the truth is that you don't understand this? — Ingo, Jul 04 '13 at 10:38

score 2 · Accepted Answer · answered Jul 04 '13 at 10:33

2

User a FileWriter. Thats should solve ur problem. The True parameter says that the next line will append to the existing file. if u use false instead the file would be overridden.

new BufferedWriter(new FileWriter("file.txt", true));

answered Jul 04 '13 at 10:33

Dennis Kriechel

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TYYYYYY recall :) works just fine now :) I tried that option, but didn't use "true" part :) – Mlad3n Jul 04 '13 at 10:39
1

I wish i can vote UP your answer, but i still don't have enough reputation :) – Mlad3n Jul 04 '13 at 10:46

Writing in file that already exists - but i have a issue

1 Answers1