利用Layui进行文件的上传和下载

1、文件下载接口

　　　/**
     * 下载附件接口
     * */
    @OpdSkip
    @RequestMapping(value = "/downloadFile",method = RequestMethod.GET)
    public CommonResponse<Boolean> downloadFile(String address, HttpServletRequest request, HttpServletResponse response) throws IOException{
        System.out.println("address:"+address);
        if(address == null){return CommonResponse.FAIL(500,"附件下载地址为空");}

        DownloadHelper.setting(request, response, "application/x-img;charset=UTF-8", address);
        return cveHoleManageService.downloadFile(address,request,response);
    }

2、DownloadHelper类　　

/**
 * @author: zuowuliu
 * @Data: 2020/8/18 16:54
 */
public class DownloadHelper {
    public static String formatName(HttpServletRequest request, String fileName) {
        try {
            if (request.getHeader("User-Agent").toUpperCase().indexOf("TRIDENT") > 0) {
                return URLEncoder.encode(fileName, "UTF-8");
            } else {
                return new String(fileName.getBytes("UTF-8"), "ISO8859-1");
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 兼用一切浏览器
     *
     * @param request
     * @param response
     * @param contentType
     * @param fileName
     * @throws IOException
     */
    public static void setting(HttpServletRequest request, HttpServletResponse response, String contentType, String fileName)
            throws IOException {
        String enFileName = formatName(request, fileName);
        response.setHeader("Content-Disposition", String.format("attachment; filename=%s", enFileName));
        response.setCharacterEncoding("UTF-8");
        if (StringUtils.isNotBlank(contentType)) {
            response.setContentType(contentType);
        }
    }
}

3、download方法

//下载附件
    public CommonResponse<Boolean> downloadFile(String address, HttpServletRequest request, HttpServletResponse response) throws IOException{

        //由于下载的这个地址本身就是绝对的存储的地址
        File file1 = new File(address);
        OutputStream os = response.getOutputStream();
        FileInputStream fileInputStream = new FileInputStream(file1);
        DataInputStream dataInputStream = new DataInputStream(fileInputStream);
        int r;
        while((r=dataInputStream.read())!=-1) {
            os.write(r);
        }
        System.out.println("已下载...");
        fileInputStream.close();
        dataInputStream.close();
        return CommonResponse.OK(true);
    }