Java实现下载模板文件

缺乏、安全感 2023-02-14 07:52 1阅读 0赞

前端js

function downloadFile(){
        var url=contextPath + 'downloadFile/downModel?fileName='模板的名称'.xls';
        window.open(url);//跳转后台的路径
    }

这就是后台完整的下载模板的代码
    
    @ApiOperation("下载模板")
    @RequestMapping(value = "/downModel",method = RequestMethod.GET,produces="application/json")
    public Result<Object> downModel(HttpServletResponse response, HttpServletRequest request) {
        Result<Object> result=Result.ok();
        String fileName = request.getParameter("fileName");
        ServletOutputStream out;
        response.setContentType("multipart/form-data");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html");
        try{
            String filePath = getClass().getResource("/static/template/" + fileName).getPath();//文件在项目中的存放路径
            String userAgent = request.getHeader("User-Agent");
            if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
                fileName = URLEncoder.encode(fileName, "UTF-8");
            } else {
                // 非IE浏览器的处理：
                fileName = new String((fileName).getBytes("UTF-8"), "ISO-8859-1");
            }
            filePath = URLDecoder.decode(filePath, "UTF-8");
            response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
            FileInputStream inputStream = new FileInputStream(filePath);
            out = response.getOutputStream();
            int b = 0;
            byte[] buffer = new byte[1024];
            while ((b = inputStream.read(buffer)) != -1) {
                // 4.写到输出流(out)中
                out.write(buffer, 0, b);
            }
            inputStream.close();
    
            if (out != null) {
                out.flush();
                out.close();
            }
        }catch (Exception e){
            log.error(ExceptionUtils.getMessage(e));
            log.error(ExceptionUtils.getStackTrace(e));
            return Result.error(e.getMessage());
        }
        return null;
    }