后端向前端传文件

最新推荐文章于 2024-05-05 17:04:41 发布

原创最新推荐文章于 2024-05-05 17:04:41 发布 · 2.6k 阅读

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#java

从后端的目录中读出文件，写入HttpServletResponse中

public void downloadFile(String filePath, HttpServletResponse response) {
        File file;
        FileInputStream in = null;
        ServletOutputStream out = null;
        try {
            String fileName = filePath.substring(filePath.lastIndexOf("/")+1);
            response.setHeader("Content-Disposition", "attachment;filename="+fileName);
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            file = ResourceUtils.getFile(filePath);
            in = new FileInputStream(file);
            out = response.getOutputStream();
            int len = 0;
            byte[] buffer = new byte[1024];
            while ((len = in.read(buffer)) != -1) {
                out.write(buffer,0,len);
            }
        }catch (Exception e){
            LOGGER.error("下载文件异常!", e);
        }finally {
            try {
                in.close();
                out.flush();
                out.close();
            }catch (Exception e){
                LOGGER.error("流关闭异常!");
            }
        }
    }