Downloading Excel using POST Rest Service - excel

Question

I'm using REST web services provided by Spring Framework.
I need to download an excel sheet but i also need to donwload the sheet on basis of some selected parameters. I'm sending a request class object as the Body to a POST Rest call(#RequestBody)
I could not download the excel using a POST Method. Please help me to achieve this.
#RequestMapping(value = "/search/export", method = RequestMethod.POST,, produces = MediaType.APPLICATION_JSON_VALUE)
public void searchResultToExcel(#RequestBody SearchRequest searchRequest, HttpServletResponse response, HttpServletRequest request) throws Exception
This is my method signature

Answer 1

I've found this thread Return Excel downloadable file from Spring that may be useful.
I also think that content-type you're forcing (produces = MediaType.APPLICATION_JSON_VALUE) might be in the way, at least as far as I could understand the question. I think you should be forcing for an EXCEL content type there (application/vnd.ms-excel).
It says:
You need to set the Content-Disposition header.
response.setHeader("Content-disposition","attachment; filename=" + yourFileName);
and write your bytes directly to the response OutputStream.
File xls = new File("exported.xls"); // or whatever your file is
FileInputStream in = new FileInputStream(xls);
OutputStream out = response.getOutputStream();
byte[] buffer= new byte[8192]; // use bigger if you want
int length = 0;
while ((length = in.read(buffer)) > 0){
out.write(buffer, 0, length);
}
in.close();
out.close();
The above is relatively old. You can construct a ResponseEntity with FileSystemResource now. A ResourceHttpMessageConverter will then copy the bytes, as I have suggested above, for you. Spring MVC makes it simpler for you rather than having you interact with interfaces from the Servlet specification.

Answer 2

#Post
#Path("downloadMyReport")
#Produces("application/excel")
public static Response generatemyExcelReport()throws BusinessException {
try {
File file=null;
Date reportDate=new Date() ;
path="/home/Documents/excelReport/"
file=getReportByName(path);
if(file==null){
logger.info("File is null");
else{
name=capitalizeFirstLater(name);
getReportSummary(reportDate);
FileUtils.writeByteArrayToFile(new File(path),createExcelForReport(fileName,path));
file=getReportByName(path);
}
ResponseBuilder response = Response.ok(file);
response.header("Content-Disposition", "attachment; filename=\"" + fileName2 + "\"");
return response.build();
}
}catch (BusinessException e) {
throw e;
}catch (Exception e) {
logger.error("Exception while generating ExcelSheetForMyReport {}",Utils.getStackTrace(e));
throw new BusinessException("Error in downloading ExcelSheetForMyReport");
}
}

Answer 3

ResponseBuilder response = Response.ok(file);
response.header("Content-Disposition", "attachment; filename=\"" + fileName2 + "\"");
return response.build();