how to convert ANSI to utf8 in java? [duplicate]

Question

I have a text file it is ANSI Encoding, i have to convert it into UTF8 encoding.

My text file is like this Stochastic programming is an area of mathematical programming that studies how to model decision problems under uncertainty. For example, although a decision might be necessary at a given point in time, essential information might not be available until a later time.

Answer 1

You can be explicit with the java.nio.charset.Charset class (windows-1252 is the proper name for ANSI):

public static void main(String[] args) throws IOException {
    Path p = Paths.get("file.txt");
    ByteBuffer bb = ByteBuffer.wrap(Files.readAllBytes(p));
    CharBuffer cb = Charset.forName("windows-1252").decode(bb);
    bb = Charset.forName("UTF-8").encode(cb);
    Files.write(p, bb.array());
}

Or in one line if you prefer =)

Files.write(Paths.get("file.txt"), Charset.forName("UTF-8").encode(Charset.forName("windows-1252").decode(ByteBuffer.wrap(Files.readAllBytes(Paths.get("file.txt"))))).array());