Java：下载文件

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阿里云国际，腾讯云国际，低至75折。AWS 93折免费开户实名账号代冲值优惠多多微信号：monov8 飞机：@monov6

前言

下载文件工具类

链接

URL链接下载
java：URLConnection后台下载文件&设置代理

本地下载

工具类

public void downloadTemplate(String fileName, HttpServletResponse response) {
        if (StringUtils.isEmpty(fileName)) {
            fileName = "./template/微信发送模板.xlsx";
        }
        log.info(fileName);
        File file = new File(fileName);
        try {
            if (!file.exists()) {
                response.sendError(404, "File not found!");
                return;
            }
            InputStream fis = new BufferedInputStream(new FileInputStream(fileName));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes("UTF-8"), "iso8859-1"));
            response.addHeader("Content-Length", "" + file.length());
            //编码
            response.setCharacterEncoding("UTF-8");
            OutputStream out = new BufferedOutputStream(response.getOutputStream());
            out.write(buffer);

            out.flush();
            out.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }