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How to append text to an existing file in Java


I need to append text repeatedly to an existing file in Java. How do I do that?

asked Jun 18, 2015 in Core java by rajesh
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If you just want something simple, this will work:

Java 7

try(PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("myfile.txt", true)))) {
    out.println("the text");
}catch (IOException e) {
    //exception handling left as an exercise for the reader
}

Older Java

try {
    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("myfile.txt", true)));
    out.println("the text");
    out.close();
} catch (IOException e) {
    //exception handling left as an exercise for the reader
}

Notes:

  • The second parameter to the¬†FileWriter¬†constructor will tell it to append to the file (as opposed to writing a new file).
  • Using a¬†BufferedWriter¬†is recommended for an expensive writer (such as¬†FileWriter).
  • Using a¬†PrintWriter¬†gives you access to¬†println¬†syntax that you're probably used to from¬†System.out.
  • But the¬†BufferedWriter¬†and¬†PrintWriter¬†wrappers are not strictly necessary.
answered Jun 18, 2015 by rajesh

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