SpringBoot#Download

_amaze!

如果不使用fastdfs等分布式的文件存储，有时候还是需要上传文件到web应用所在的服务器的磁盘上，下载文件。下面是一个小demo，关于如何用控制器进行上传和下载。

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    @PostMapping(value="/upload",produces="application/json; charset=utf-8")
    @ResponseBody
    public String upload(@RequestParam(value="file", required=false) MultipartFile file, HttpServletRequest req) {
        //String t = req.getContentType();
        //System.out.println("content type :"+t);

        String filePath = "c:/upload/";
        if (file == null) {
            return "200";
        }

        String fileName = file.getOriginalFilename();
        File dest = new File(filePath + fileName);

        try {
            file.transferTo(dest);
            System.out.println("上传成功:"+dest.getAbsolutePath());
            return "上传成功:"+dest.getAbsolutePath();
        } catch (IOException e) {
            System.out.println(e.getLocalizedMessage());
        }
        return "上传失败!"+e.getLocalizedMessage();
    }

    @RequestMapping("/download/xxxx/{uid}")
    public String downLoad2(HttpServletResponse response, @PathVariable long uid){
        String filename=uid+"_front.png";
        File file = xxxxService.xxxxMethod(uid);
        if(file.exists()){ //判断文件父目录是否存在
            response.setContentType("application/force-download");
            response.setHeader("Content-Disposition", "attachment;fileName=" + filename);

            byte[] buffer = new byte[1024];
            FileInputStream fis = null; //文件输入流
            BufferedInputStream bis = null;

            OutputStream os = null; //输出流
            try {
                os = response.getOutputStream();
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                int i = bis.read(buffer);
                while(i != -1){
                    os.write(buffer);
                    i = bis.read(buffer);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
            System.out.println("----------file download:" + filename);
            try {
                bis.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

　　

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