后端向前端传文件

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!");}}}

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