以Springboot的方式文件下载，有如下两个示例：
方式一
@RequestMapping(value = {"/dl"}, method = {RequestMethod.GET})
public ResponseEntity<ByteArrayResource> downloadFile1() throws IOException {
Path path = Paths.get("C:/文件.xlsx");
byte[] data = Files.readAllBytes(path);
ByteArrayResource resource = new ByteArrayResource(data);
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + URLEncoder.encode(path.getFileName().toString(), "UTF-8"))
.contentType(MediaType.APPLICATION_OCTET_STREAM).contentLength(data.length)
.body(resource);
}
方式二
@RequestMapping(value = {"/dl"}, method = {RequestMethod.GET})
public ResponseEntity<InputStreamResource> downloadFile1() throws IOException {
File file = new File("C:/文件.xlsx");
InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + URLEncoder.encode(file.getName(), "UTF-8"))
.contentType(MediaType.APPLICATION_OCTET_STREAM).contentLength(file.length())
.body(resource);
}
