Given InputStream replace character and produce OutputStream

Question

I have a lot of massive files I need convert to CSV by replacing certain characters.

I am looking for reliable approach given InputStream return OutputStream and replac

Answer 1

            FileWriter writer = new FileWriter("Report.csv");
            BufferedReader reader = new BufferedReader(new InputStreamReader(YOURSOURCE, Charsets.UTF_8));
            String line;
            while ((line = reader.readLine()) != null) {
                line.replace('c1', 'c2');
                writer.append(line);
                writer.append('\n');
            }
            writer.flush();
            writer.close();