前端get请求接收后端传来的二进制文件流blob实现下载功能，解决下载文件打不开问题

解决方法：
        前端在请求下载文件接口时，要设置responseType为blob。
前端代码：

export function download(url,) {
  return request({
    url: url + '?' + qs.stringify(params, { indices: false }),
    method: 'get',
    responseType: 'blob'
  })
}

后端下载文件接口：

1. 控制器：

@ApiOperation(value = "下载模板" , notes = " \n author：LiFang ")
    @GetMapping("/downloadTemplate")
    public Result<Void> downloadTemplate(HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException {
        File file = ResourceUtils.getFile("classpath:template/excel/学生信息模板.xlsx");
        FileUtils.downloadFile(request, response, file, false);
        return Result.success();
    }

2. 下载文件工具类
   FileUtils.java

public class FileUtils extends cn.hutool.core.io.FileUtil {
    public static void downloadFile(HttpServletRequest request, HttpServletResponse response, File file,
                                    boolean deleteOnExit) {
        response.setCharacterEncoding(request.getCharacterEncoding());
        response.setContentType("application/octet-stream");
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
            IOUtils.copy(fis, response.getOutputStream());
            response.flushBuffer();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                    if (deleteOnExit) {
                        file.deleteOnExit();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}