后端实现预览pdf，mp4,图片

PDF预览

  /*** pdf预览* @param response*/@RequestMapping(value = "/preview")public void showPdf(HttpServletResponse response) {try {//String filePath = this.getClass().getClassLoader().getResource("../../static/pdf/readme.pdf").getPath();String filePath = "E:\\歌\\2022_420300_1716900370656\\监督\\2_关于加强取的通知.pdf";File file = new File(filePath);FileInputStream fileInputStream = new FileInputStream(file);response.setHeader("Content-Type", "application/pdf");OutputStream outputStream = response.getOutputStream();IOUtils.write(IOUtils.toByteArray(fileInputStream), outputStream);} catch(Exception e) {e.printStackTrace();}}

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视频预览

@GetMapping("/download")
public void download(HttpServletResponse response) throws IOException {File file = new File("/Users/zxk/Movies/1.2G.mp4");response.setContentType("video/mp4;charset=utf8");
//设置下载文件名response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());
//中文乱码处理
//response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(file.getName(), "UTF-8") );
//网页直接播放
response.setHeader("Content-Disposition", "inline");
//下载进度response.setContentLengthLong(file.length());
try (InputStream inputStream = new FileInputStream(file);OutputStream outputStream = response.getOutputStream()) {IOUtils.copy(inputStream, outputStream);}}

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图片预览

    @ApiOperation("访问文件")@GetMapping("/download/{name}")public void getImage(HttpServletResponse response, @PathVariable("name") String name) throws IOException {//动态获取图片存放位置//        String path = getUploadPath();//获取当前系统路径String path = upload;String imagePath = path + File.separator + name;if (!new File(imagePath).exists()) {return;}if (name.endsWith("jpg") || name.endsWith("png") || name.endsWith("gif") || name.endsWith("jpeg")) {//预览时不需设置Content-Dispositionresponse.setContentType("image/jpeg;charset=utf-8");//图片}else {//下载response.setContentType("application/octet-stream");//文件response.setHeader("Content-Disposition", "inline; filename=" + URLEncoder.encode(name, "UTF-8"));}ServletOutputStream outputStream = response.getOutputStream();outputStream.write(Files.readAllBytes(Paths.get(path).resolve(name)));outputStream.flush();outputStream.close();}

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