FileOutputStream csvStream = new FileOutputStream("p:/test.csv");

Json2Csv.build(csvStream,"",
   new String { "cod", "desc" },
                                                   new String { "Code","Description" });

csvStream.close();

FileOutputStream xlsStream = new FileOutputStream("p:/test.xls");

Json2Excel.build(xlsStream, "",
      new String { "cod", "desc" },
                                                      new String { "Code", "Description" });

xlsStream.close();