springboot中Excel文件下载踩坑大全

response.setHeader("Content-Disposition",
                "attachment;filename=" + new String("下载模板".getBytes("UTF-8"), "ISO8859-1"));

response.setHeader("Content-Disposition", "attachment;fileName=" + 
URLEncoder.encode("线索导入模板.xlsx","utf8"));

/加上设置大小 下载下来的excel文件才不会在打开前提示修复
response.addHeader("Content-Length",String.valueOf(file.length()));

 ClassPathResource classPathResource = new ClassPathResource("template/template.xlsx");

@Operation(summary = "下载模版",description = "下载模版")
@GetMapping("/download")
public void download(HttpServletResponse response){
    templateService.download(response);
}

/**
 * 下载线索模板
 * @param response
 */
public void download(HttpServletResponse response) {
    InputStream inputStream = null;
    BufferedInputStream bis = null;
    OutputStream outputStream = null;
    try {
        ClassPathResource classPathResource = new ClassPathResource("template/template.xlsx");
        inputStream = classPathResource.getInputStream();

        response.setContentType("application/octet-stream");
        response.setHeader("content-type", "application/octet-stream");
        //待下载文件名
        String fileName = URLEncoder.encode("模板.xlsx","utf8");
        response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
        //加上设置大小 下载下来的excel文件才不会在打开前提示修复
        response.addHeader("Content-Length",String.valueOf(classPathResource.getFile().length()));

        byte[] buff = new byte[1024];
        outputStream = response.getOutputStream();
        bis = new BufferedInputStream(inputStream);
        int read = bis.read(buff);
        while (read != -1) {
            outputStream.write(buff, 0, buff.length);
            outputStream.flush();
            read = bis.read(buff);
        }
    } catch ( IOException e ) {
        log.error("文件下载失败,e");
    } finally {
        IOUtils.closeQuietly(outputStream);
        IOUtils.closeQuietly(inputStream);
        IOUtils.closeQuietly(bis);
    }
}