Are there any possible speed improvements I can make to the following method. It takes a JDBC ResultSet and breaks it into several CSV files:public static void convertToCSV(final ResultSet rs) throws SQLException, IOException {    final DateFormat format = new SimpleDateFormat(yyyyMMdd,HH:mm:ss);    format.setTimeZone(TimeZone.getTimeZone(Etc/UTC));    final StringBuilder sb = new StringBuilder();    while (rs.next()) {        final File file = new File(sb.append(rs.getString(FIELD1)).append(.csv).toString());        if (!file.exists()) {            file.createNewFile();        }        final BufferedWriter fw = new BufferedWriter(new FileWriter(file.getAbsoluteFile(), true));        fw.write(rs.getString(FIELD2));        fw.write(',');        fw.write(rs.getString(FIELD3));        fw.write(',');        final String clobValue = rs.getString(FIELD4);        if(clobValue==null)            fw.write(null,);        else{            fw.write('\');            fw.write(clobValue);            fw.write(\,);        }        final Date date = new Date(rs.getLong(FIELD5));        fw.write(format.format(date));        fw.write('\n');        fw.close();        sb.setLength(0);    }    rs.close();}
Speeding Up BufferedWriter
java;performance;file;file system;io