文件下载2

@RequestMapping(value="/export",method=RequestMethod.GET)
public ResponseEntity<byte[]> test(HttpServletRequest request) throws Exception {
    FileInputStream fileInputStream = new FileInputStream(String path);//path 文件路径
    byte[] b = new byte[fileInputStream.available()];
    fileInputStream.read(b);
    HttpHeaders headers = new HttpHeaders();
    headers.add("Content-Disposition", "attachment;filename=a.xls"); //生成的文件名
    return new ResponseEntity(b,headers,HttpStatus.OK);
}