下载文件 java spring rest api
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download file java spring rest api
提问by Fernando Castilla Ospina
i want to make a rest api controller (spring boot) that when petitioned with a get will allow me to download an excel file. currently i have this endpoint:
我想制作一个rest api控制器（spring boot），当使用get请求时，它将允许我下载一个excel文件。目前我有这个端点：
@RequestMapping(value = "/download.xls", method = RequestMethod.GET)
public ResponseEntity Survey_Reports(@RequestParam(value = "evaluated") String evaluated){
return surveyService.getSurveysFile(evaluated);
}
wich ultimately calls to this method:
最终调用此方法：
public static ResponseEntity getDownloadResponse() {
File file2Upload = new File("Survey_Reports.xls");
Path path = Paths.get(file2Upload.getAbsolutePath());
ByteArrayResource resource = null;
try {
resource = new ByteArrayResource(Files.readAllBytes(path));
} catch (IOException e) {
logger.error("there was an error getting the file bytes ", e);
}
return ResponseEntity.ok()
.contentLength(file2Upload.length())
//this line doesnt seem to work as i set the file format in the controller request mapping
.contentType(MediaType.parseMediaType("application/vnd.ms-excel"))
.body(resource);
}
everything seems to work semi-fine as i get the download.xls(as the mapping) file correclty, but now i want to make the downloaded file have some specific name like: evaluatedName.xls or userDateEndDate.xls or some other stuff, is there a way to edit the response entity to do so? so that i dont have to name the mapping "download.xls"
当我得到 download.xls（作为映射）文件正确性时，一切似乎都正常工作，但现在我想让下载的文件具有一些特定的名称，例如：evaluateName.xls 或 userDateEndDate.xls 或其他一些东西，是有没有办法编辑响应实体来这样做？这样我就不必将映射命名为“download.xls”
回答by Matej Marconak
In context of HttpServletResponse responseyou can do this like this
在HttpServletResponse 响应的上下文中，您可以这样做
response.setContentType("application/csv");
response.setHeader("Content-Disposition", "attachment; filename=" + csvName);
and for ResponseEntityi assume you can use something like this:
对于ResponseEntity我假设你可以使用这样的东西：
ResponseEntity.ok().header("Content-Disposition","attachment; filename=" + csvName );
