Is it possible to download a file with HTTP POST?

Question

Is it possible to download a file with HTTP POST? I know the \"Get\" way(windows.location), but in my case, there are a lot of param that should be passed to server

Answer 1

I managed to solve it using this:

service.js

downloadExcel : function() {
    var mapForm = document.createElement("form");
    mapForm.target ="_self"||"_blank";
    mapForm.id="stmtForm";
    mapForm.method = "POST";
    mapForm.action = "your_Controller_URL";

    var mapInput = document.createElement("input");
    mapInput.type = "hidden";
    mapInput.name = "Data";
    mapForm.appendChild(mapInput);
    document.body.appendChild(mapForm);

    mapForm.submit();
}

Spring Controller Code :

@Controller

@PostMapping(value = "/your_Controller_URL")
    public void doDownloadEmsTemplate( final HttpServletRequest request, final HttpServletResponse response)
            throws IOException, URISyntaxException {

        String filePath = "/location/zzzz.xls";
        logger.info("Excel Template File Location Path :" + filePath);
        final int BUFFER_SIZE = 4096;
        ServletContext context = request.getServletContext();
        String appPath = context.getRealPath("");
        String fullPath = appPath + filePath;
        File downloadFile = new File(fullPath);
        FileInputStream inputStream = new FileInputStream(downloadFile);
        String mimeType = context.getMimeType(fullPath);
        if (mimeType == null) {
            //mimeType = "application/octet-stream";
            mimeType = "application/vnd.ms-excel";
        }
        logger.info("MIME type: " + mimeType);
        response.setContentType(mimeType);
        response.setContentLength((int) downloadFile.length());
        String headerKey = "Content-Disposition";
        String headerValue = String.format("attachment; filename=\"%s\"", downloadFile.getName());
        logger.info("File Download Successfully : ");
        response.setHeader(headerKey, headerValue);
        OutputStream outStream = response.getOutputStream();
        byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead = -1;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, bytesRead);
        }
        inputStream.close();
        outStream.close();
    }