后端部分可分为三步:
1,获取文件参数(非必须,根据自己情况添加)
2,获取文件
3,以流形式返回
具体代码如下:
@GetMapping("/getFileByUrl")@ApiOperationSupport(order = 7)@ApiOperation(value = "逻辑删除", notes = "传入ids")public void getFileByUrl(@ApiParam(value = "主键集合", required = true) @RequestParam String url,HttpServletResponse response) throws Exception {byte[] buffer = new byte[1024];FileInputStream fis = null;BufferedInputStream bis = null;try {//获取部分参数,用于从minIO上将文件下载到tmp(此步骤不是必须)String[] split = url.split("\\.");String suffix = split[1];Long userId = AuthUtil.getUser().getUserId();String userName = AuthUtil.getUser().getUserName();DownloadInvokePacket packet = InvokePacketUtil.getDownloadInvokePacketForRandomUrl("综合检索文件下载", String.valueOf(userId), userName, suffix, SystemEnum.MANAGE, SystemEnum.MINIO);//拿到这个文件File file = MinioUtil.publishDownload(packet, url);response.setContentType("application/octet-stream");response.setHeader("content-type", "application/octet-stream");response.setHeader("Content-Disposition", "attachment;fileName=download" + DateUtil.time());// 设置文件名//返回流处理fis = new FileInputStream(file);bis = new BufferedInputStream(fis);OutputStream os = response.getOutputStream();int i = bis.read(buffer);while (i != -1) {os.write(buffer, 0, i);i = bis.read(buffer);}}catch (Exception e) {}finally {if (bis != null) {try {bis.close();} catch (IOException ignored) {}}if (fis != null) {try {fis.close();} catch (IOException ignored) {}}}}
前端展示部分。
1,首先在你的axios接口上添加 responseType:'blob'
,以表示你将以blob形式接收(必须添加)。
export const getFileByUrl = (url) => { return request({ url: '/api/comprehensiveSearchLog/getFileByUrl', method: 'get', responseType:'blob', params: {url} })}
2,拿到接口返回值后,将其转为blob形式
const blob = new Blob([result.data], { type: type });console.log(blob);let src = window.URL.createObjectURL(blob);console.log(src);
此时打印该blob,会是下面这种样子:
接下来,你可以将拿到的src变量打印,是这种样子:
将这个src变量赋值到标签的src上,就可展示此图片了。
来源地址:https://blog.csdn.net/qq_43952288/article/details/129726245