针对微服务通用文件下载接口

• 文件下载接口
• FileUtils中的方法
• 前端使用js调用

文件下载接口

    /**
     * @param affixFileUrl 文件下载地址
     * @param affixFileName 文件名
     * @param response
     * @param request
     * @return
     */
    @ApiOperation(value = "下载", notes = "下载附件")
    @RequestMapping(value = "/downloadAffix", method = RequestMethod.GET)
    public Result downloadAffix(@RequestParam(value = "affixFileUrl", required = true) String affixFileUrl,
                                @RequestParam(value = "affixFileName", required = true) String affixFileName,
                                HttpServletResponse response, HttpServletRequest request) {
        Result<?> result = new Result<>();
        BufferedInputStream bis = null;
        OutputStream os = null;
        try {
            String userAgent = request.getHeader("User-Agent");
            //解决下载时文件名乱码问题
            // 针对IE或者以IE为内核的浏览器：
            if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
                affixFileName = java.net.URLEncoder.encode(affixFileName, "UTF-8");
            } else {
                // 非IE浏览器的处理：
                affixFileName = new String(affixFileName.getBytes("UTF-8"), "ISO-8859-1");
            }

            FileUtils fileUtils=new FileUtils();
            response.setHeader("content-type", "application/octet-stream");
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=" + affixFileName);

            byte[] buff = new byte[1024];
            //因需要这里截掉了服务名，非必须
            affixFileUrl = affixFileUrl.replace("/"+ftpUtil.getServerName()+"/","");
            //文件路径拼接
            String filePath= fileUtils.getFilePath()+affixFileUrl;
            os = response.getOutputStream();
            bis = new BufferedInputStream(new FileInputStream(new File(filePath)));
            int i = bis.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                os.flush();
                i = bis.read(buff);
            }
        }catch (Exception e){
            log.error(e.getMessage());
            return Result.error(-1, e.getMessage());
        }finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        log.info("下载附件成功:");
        return result.success("下载成功");

FileUtils中的方法

/**
	 * 获取文件当前路径
	 * @return
	 */
	public  String  getFilePath(){
		ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
		HttpServletRequest request = attr.getRequest();
		String filePath=request.getSession().getServletContext().getRealPath("/");
		return filePath;
	}

前端使用js调用

//下载附件
        function downloadAffix(affixFileUrl,affixFileName) {
            window.location.href = '/file-server'+'/gjpxfile/downloadAffix?affixFileUrl=' + affixFileUrl+'&affixFileName='+affixFileName;
        }