How to Convert InputStream to String in Java

    /**
     * read a file and converting it to String using StringBuilder
     */
    public static String stringBuilder(String fileName) throws IOException {

        StringBuilder sbuilder = null;
        FileInputStream fStream = null;
        BufferedReader input = null;

        try {

            fStream = new FileInputStream(fileName);
            input = new BufferedReader(new InputStreamReader(fStream, "UTF-8"));

            sbuilder = new StringBuilder();

            String str = input.readLine();

            while (str != null) {
                sbuilder.append(str);
                str = input.readLine();
                if (str != null) {

                    sbuilder.append("\n");

                }
            }

        } finally {
            input.close();
            fStream.close();
        }

        return sbuilder.toString();
    }

    

     /**
     * read a file and converting it to String using StringWriter
     */
    public static String stringWriter(String fileName) throws IOException {

        char[] buff = new char[1024];
        Writer stringWriter = new StringWriter();
        FileInputStream fStream = null;

        try {

            fStream = new FileInputStream(fileName);
            Reader bReader = new BufferedReader(new InputStreamReader(fStream, "UTF-8"));
            int n;
            while ((n = bReader.read(buff)) != -1) {
                stringWriter.write(buff, 0, n);
            }
        } finally {
            stringWriter.close();
            fStream.close();
        }
        return stringWriter.toString();
    }