后端部分

  @GetMapping("/t1")
    public void down1(HttpServletResponse response) throws Exception {
        response.reset();
        response.setContentType("application/octet-stream;charset=utf-8");
        response.setHeader(
                "Content-disposition",
                "attachment; filename=Xftp-7.0.0144p.exe");
        try(
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\\Xftp-7.0.0144p.exe"));
                // 输出流
                BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
        ){
            byte[] buff = new byte[1024];
            int len = 0;
            while ((len = bis.read(buff)) > 0) {
                bos.write(buff, 0, len);
            }
        }
    }

前端部分 一个简单的点击事件

<el-button size="mini" @click="download">文件下载</el-button>

  download(){

      location.href="http://localhost:8202/admin/cmn/dict/t1"

    },