download is not performed via outputStream

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I am trying to download a file. CSV that I have saved. However the download does not appear to me when I click the button and no error code appears.

How can I test to see how far the procedure is being performed?

Follows the code:

@RequestMapping(value = { "/gerarCsv/" })
    @ResponseBody
    public void gerarCsv(HttpServletRequest request, HttpServletResponse response,
            @RequestParam(value = "inicio", required = true) String inicio,
            @RequestParam(value = "fim", required = true) String fim) {
        try {

            Date dataInicio = new SimpleDateFormat("dd-MM-yyyy").parse(inicio);
            Date dataFim = new SimpleDateFormat("dd-MM-yyyy").parse(fim);

            List<RevogacaoConsolidado> revogacaoConsolidado = revogacao.consultarRevogacaoconsolidado(dataInicio,
                    dataFim);

            File arquivo = new File(context.getRealPath("WEB-INF/classes/statics/downloads/revogacao.csv"));

            logger.info("[Recurso:/admin/revogacao/revogacaoPorDataCSV, sessao:" + request.getSession().getId()
                    + ", usuario:" + request.getUserPrincipal().getName() + "]" + "[Caminho ]" + arquivo);

            // Cria arquivo caso não exista.
            if (!arquivo.exists()) {
                arquivo.createNewFile();
            }

            /*
             * Escreve o arquivo e guarda dentro do caminho desejado objeto arquivo
             */
            FileWriter fw = new FileWriter(arquivo);
            BufferedWriter bw = new BufferedWriter(fw);

            bw.write("Data" + ";" + "Login" + ";" + "Nome" + ";" + "Sucesso" + ";" + "Erro" + ";" + "Não Cadastrado"
                    + ";" + "Já removido" + ";" + "Total" + ";" + "Porcentagem de Erro %");

            for (RevogacaoConsolidado revog : revogacaoConsolidado) {
                bw.newLine();
                bw.write(revog.getData_processo() + ";" + revog.getLogin() + ";" + revog.getNome() + ";"
                        + revog.getSucesso() + ";" + revog.getErro() + ";" + revog.getNao_cadastrado() + ";"
                        + revog.getJa_removido() + ";" + revog.getTotal() + ";" + revog.getPorcentagem_erro());

            }

            bw.close();
            fw.close();

            /*
             * realiza o download do conteudo.
             */
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=revogacao.csv");
            response.setContentLengthLong((int) arquivo.length());

            FileInputStream fileIn = new FileInputStream(arquivo);
            ServletOutputStream out = response.getOutputStream();
            try {

                byte[] outputByte = new byte[4096];
                int lidos = -1;
                while ((lidos = fileIn.read(outputByte)) != -1) {
                    out.write(outputByte, 0, lidos);
                }
                fileIn.close();
                out.flush();
                out.close();

                System.out.println("Download de arquivo");
                logger.info("[Recurso:/admin/revogacao/revogacaoPorDataCSV, sessao:" + request.getSession().getId()
                        + ", usuario:" + request.getUserPrincipal().getName() + "]"
                        + "[Verificação de Revogações por data de processado CSV ] [download de arquivo Realizado]");
            } catch (FileNotFoundException ex) {
                ex.printStackTrace();
            }
            logger.info("[Recurso:/admin/revogacao/revogacaoPorDataCSV, sessao:" + request.getSession().getId()
                    + ", usuario:" + request.getUserPrincipal().getName() + "]"
                    + "[Verificação de Revogações por data de processado CSV ]");

        } catch (Exception e) {
            logger.info("[Recurso:/admin/revogacao/revogacaoPorDataCSV, sessao:" + request.getSession().getId()
                    + ", usuario:" + request.getUserPrincipal().getName() + "]"
                    + "[Verificação de Revogações por data de processado] error: " + e);
        }
    }

Note: Checking the Chrome console, in the Network tab, I see that the request was made and the method successfully called, was generated until a Replay with the generated data. When I see in Timing I see that there was a time for content Download. It should not be being performed to download the file?

java spring-mvc input-output inputstream

1 answer

1

I imagine you need to use the write() to download your file in the browser, with the object HttpServletResponse:

response.setHeader("Content-disposition", "attachment; filename=seu_arquivo");
response.getOutputStream().write();
response.getOutputStream().flush();
response.getOutputStream().close();

  • In this case, my Write is inside While, if you observe while ((read = fileIn.read(outputByte)) != -1) { out.write(outputByte, 0, read); }

  • But you need to write in Sponse to download the file from the browser. The OutputStream that I refer to is the getOutputStream() of HttpServletResponse response

  • I understand, but I’m doing this procedure only separately. in the case my OUT object corresponds to the Response.getOutputStream() and inside While is where I use Write()

  • just as an addition. When I check Response within Network -> my function -> Response. I see that the data he searched is there, instead of downloading the file.

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