Spring构建CSV字符串并用它下载文件

Question

我想要的是当我访问/getcsv下载一个csv file

@RequestMapping(value = "/getcsv", method = RequestMethod.GET)

public void getCSV(HttpServletResponse response){

    String csv = "a,b";

    response.setContentType("text/csv");

    //what to do now?

}

我不知道如何激发csv file包含我的字符串的下载。

Answer 1

您可以在响应的输出流中写入数据。    @RequestMapping(value = "/getcsv", method = RequestMethod.GET)    public void getCSV(HttpServletResponse response){        String csv = "a,b";        response.setContentType("application/octet-stream");        response.setHeader("Content-Disposition", "fileName.csv");        response.setHeader("Access-Control-Expose-Headers","Authorization, Content-Disposition");        try (PrintWriter pw = new PrintWriter(response.getOutputStream())) {            pw.write(csv);        }    }

Answer 2

您可以尝试以下代码。@PostMapping(value = "/getcsv", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)&nbsp; public ResponseEntity<?> downloadFile(@RequestParam("fileName") String fileName) {&nbsp; &nbsp; String dirPath = "E:/some-directory-path/";&nbsp; &nbsp; byte[] fileBytes = null;&nbsp; &nbsp; try {&nbsp; &nbsp; &nbsp; fileBytes = Files.readAllBytes(Paths.get(dirPath + fileName));&nbsp; &nbsp; } catch (IOException e) {&nbsp; &nbsp; &nbsp; e.printStackTrace();&nbsp; &nbsp; }&nbsp; &nbsp; return ResponseEntity.ok()&nbsp; &nbsp; &nbsp; &nbsp; .contentType(MediaType.APPLICATION_OCTET_STREAM)&nbsp; &nbsp; &nbsp; &nbsp; .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"")&nbsp; &nbsp; &nbsp; &nbsp; .body(fileBytes);&nbsp; }您必须设置为 Application Octet Stream 才能下载任何文件。