Dumping a Java StringBuilder to File

Question

What is the most efficient/elegant way to dump a StringBuilder to a text file?

You can do:

outputStream.write(stringBuilder.toString().getBytes());
         


        

Answer 1

Based on https://stackoverflow.com/a/1677317/980442

I create this function that use OutputStreamWriter and the write(), this is memory optimized too, better than just use StringBuilder.toString().

public static void stringBuilderToOutputStream(
        StringBuilder sb, OutputStream out, String charsetName, int buffer)
        throws IOException {
    char[] chars = new char[buffer];
    try (OutputStreamWriter writer = new OutputStreamWriter(out, charsetName)) {
        for (int aPosStart = 0; aPosStart < sb.length(); aPosStart += buffer) {
            buffer = Math.min(buffer, sb.length() - aPosStart);
            sb.getChars(aPosStart, aPosStart + buffer, chars, 0);
            writer.write(chars, 0, buffer);
        }
    }
}