[RESOLVIDO] vRaptor - Gerar planilha com vRaptor

public class GeradorDePlanilha extends HttpServlet {
	/**
	 * 
	 */
	private static final long serialVersionUID = 4488067535475167468L;
	HSSFWorkbook wb; 
    HSSFSheet sheet; 
    HSSFRow row; 
    HSSFCell cell; 
 
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GeradorDePlanilha() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
        try { 
        	//obter os valores pelo request
        	String idCenario = request.getParameter("cenario");
        	String operacao = request.getParameter("operacao");
        	if(idCenario != null && operacao != null){
	        	Long id = Long.parseLong(idCenario);
	        	//consultar no banco
	        	//??????????????????????????????
	        	
	        	System.out.println("GERADOR DE PLANILHA SERVLET");
	            OutputStream out = response.getOutputStream(); 
	            gerarArquivoExcel(); 
	            // escreve planilha como resposta 
	            response.setContentType("application/vnd.ms-excel"); 
	            response.setHeader("Content-Disposition", "attachment; filename=Minha_Planilha.xls"); 
	            wb.write(out); 
	            out.flush(); 
	            out.close(); 
        	}else{
        		System.out.println("Parametro(s) nulo(s)! cenario: "+idCenario+" - operacao: "+operacao);
        	}
        } catch (Exception e) { 
            throw new ServletException("Erro ao gerar o arquivo do Excel. ", e); 
        }  
 
	}