【springboot2.x】实现文件下载

    @ApiOperation("日志下载")
    @GetMapping("/logDownload")
    public void download(HttpServletResponse response) {
        try {
            String mulu = "d:/logs";
            ZipUtil.zip(mulu);
            String path = "d:/logs.zip";
            // 压缩日志
            // path是指想要下载的文件的路径
            File file = new File(path);
            log.info(file.getPath());
            // 获取文件名
            String filename = file.getName();
            // 获取文件后缀名
            //String ext = filename.substring(filename.lastIndexOf(".") + 1).toLowerCase();
            //log.info("文件后缀名：" + ext);
            // 将文件写入输入流
            FileInputStream fileInputStream = new FileInputStream(file);
            InputStream fis = new BufferedInputStream(fileInputStream);
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 设置response的Header
            response.setCharacterEncoding("UTF-8");
            //Content-Disposition的作用：告知浏览器以何种方式显示响应返回的文件，用浏览器打开还是以附件的形式下载到本地保存
            //attachment表示以附件方式下载 inline表示在线打开 "Content-Disposition: inline; filename=文件名.mp3"
            // filename表示文件的默认名称，因为网络传输只支持URL编码的相关支付，因此需要将文件名URL编码后进行传输,前端收到后需要反编码才能获取到真正的名称
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
            // 告知浏览器文件的大小
            response.addHeader("Content-Length", "" + file.length());
            OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            outputStream.write(buffer);
            outputStream.flush();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @RequestMapping("/download")
    public ResponseEntity downloadFile() {
        try {
            String mulu = "d:/logs";
            ZipUtil.zip(mulu);
            String path = "d:/logs.zip";
            File file = new File(path);
            InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

            HttpHeaders headers = new HttpHeaders();
            headers.setContentLength(file.length());
            headers.setContentType(MediaType.parseMediaType("application/octet-stream"));
            headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
            headers.add("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getName()));

            return ResponseEntity.ok()
                    .headers(headers)
                    .contentLength(file.length())
                    .contentType(MediaType.parseMediaType("application/octet-stream"))
                    .body(resource);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    @GetMapping("/download2")
    public void downloadFile(HttpServletResponse response) {
        try {
            String mulu = "d:/logs";
            ZipUtil.zip(mulu);
            String path = "d:/logs.zip";
            File file = new File(path);
            response.reset();
            response.setContentType("application/octet-stream; charset=utf-8");
            response.setHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getName()));
            response.addHeader("Content-Length", String.valueOf(file.length()));
            response.addHeader("Content-Range", String.format("bytes 0-%s/%s", file.length() - 1, file.length()));
            //Hutool.copy(new FileInputStream(file), response.getOutputStream(), true);
            FileInputStream fileInputStream = new FileInputStream(file);
            ServletOutputStream outputStream = response.getOutputStream();
            IoUtil.copy(fileInputStream, outputStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }