How to write to a file without deleting privious existing data

Question

I am try to write data to a text file. I am using this code:

try (Writer writer = new BufferedWriter(new OutputStreamWriter(
          new FileOutputStream("filename.txt"), "utf-8"))) {
writer.write("something");
}

But while the program is running, the file is overwriting the exist data that are already found in the text file. How can i write new data lines to the same text file without overwriting it ? Is there any easy and simple way to write it?

the page you provide it does not work with me because of that i posted my question here @ekuusela — medo0070, Apr 28 '15 at 16:09

score 3 · Answer 1 · edited Apr 28 '15 at 16:17

3

I think you may use FileWriter(File file, Boolean append)

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

edited Apr 28 '15 at 16:17

smac89

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answered Apr 28 '15 at 15:49

btrbt

44
3

score 3 · Accepted Answer · answered Apr 28 '15 at 16:13

try (Writer writer = Files.newBufferedWriter(
          Paths.get("filename.txt"), StandardCharsets.UTF_8,
          StandardOpenOption.WRITE,
          StandardOpenOption.APPEND)) {
    writer.write("something");
}

The open options are a varargs list, and default to new file creation.

BTW FileWriter uses the platform encoding, so you where right to not use that class. It is not portable.

How to write to a file without deleting privious existing data

2 Answers2