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這篇文章主要介紹Java中如何實(shí)現(xiàn)實(shí)現(xiàn)文件資料上傳并生成縮略圖,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
用戶有一個(gè)需求就是收藏的功能,單純的收藏記錄好做,但是想加點(diǎn)難度就是,生成縮略圖。類似B站的收藏一樣。
1.如何生成縮略圖?
2.收藏的時(shí)候生成縮略圖還是文件上傳的時(shí)候生成縮略圖?
3.生成的縮略圖存在哪里?
1.文件截取比較慢,如何解決?
方法:使用多線程
2.通過new File()無法獲取網(wǎng)絡(luò)文件?
File file = new File("http://d-godone.dmsd.tech/goDone/M00/00/0A/wKg8O2D2mnqEMg7wAAAAALbl5Ys275.pdf");
方法:使用工具類FileUtils.copyURLToFile(url,file)
3.文件上傳需要MultipartFile類型,但是截取出來的類型為Frame和BufferedImage,怎么弄?
方法:查閱資料封裝出,文件轉(zhuǎn)換的方法。
/** * @Author: Promsing(張有博) * @Date: 2021/9/18 - 0:25 * @Description: 圖片的處理類 * @version: 1.0 */ @Slf4j @Component public class ImageProcessing extends TypeProcessing{ @Autowired private FastFileStorageClient fastFileStorageClient; @Autowired private ThumbImageConfig thumbImageConfig; private String group="http://192.168.y.y:8888/group1/"; /** * * @param fileName 本地文件的位置 * @return */ @Override public String fileUpload(String fileName) { File file = new File(fileName); // 上傳并且生成縮略圖 StorePath storePath = null; try { storePath = this.fastFileStorageClient.uploadImageAndCrtThumbImage( new FileInputStream(file), file.length(), "png", null); } catch (FileNotFoundException e) { e.printStackTrace(); } //String path = thumbImageConfig.getThumbImagePath(storePath.getPath()); String imageUrl=group+thumbImageConfig.getThumbImagePath(storePath.getPath()); return imageUrl; } }
/** * @Author: Promsing(張有博) * @Date: 2021/9/18 - 0:37 * @Description: 視頻的處理類 * @version: 1.0 */ @Component @Slf4j public class VideoProcessing extends TypeProcessing { @Override public String fileUpload(String videoFileName) { //最后獲取到的視頻的圖片的路徑 String videPicture=""; //Frame對(duì)象 Frame frame = null; //標(biāo)識(shí) int flag = 0; try { /* 獲取視頻文件 */ // FFmpegFrameGrabber fFmpegFrameGrabber = new FFmpegFrameGrabber(videoPath + "/" + videoFileName); FFmpegFrameGrabber fFmpegFrameGrabber = new FFmpegFrameGrabber( videoFileName); fFmpegFrameGrabber.start(); //獲取視頻總幀數(shù) int ftp = fFmpegFrameGrabber.getLengthInFrames(); log.info("時(shí)長 " + ftp / fFmpegFrameGrabber.getFrameRate() / 60); while (flag <= ftp) { frame = fFmpegFrameGrabber.grabImage(); /* 對(duì)視頻的第五幀進(jìn)行處理 */ if (frame != null && flag==5) { // //文件轉(zhuǎn)換 BufferedImage bufferedImage =FileCaseUtil.FrameToBufferedImage(frame); MultipartFile multipartFile =FileCaseUtil. fileCase(bufferedImage); log.info("開始文件上傳:"); //文件上傳 String fileLoad = FileUploadUtil.fileLoad(multipartFile); videPicture=fileLoad; log.info("文件上傳成功{}",fileLoad); break; } flag++; } fFmpegFrameGrabber.stop(); fFmpegFrameGrabber.close(); } catch (Exception E) { E.printStackTrace(); } return videPicture; } }
/** * @Author: Promsing(張有博) * @Date: 2021/9/18 - 0:29 * @Description: PDF的處理類 * @version: 1.0 */ @Slf4j @Component public class PDFProcessing extends TypeProcessing{ @Override public String fileUpload(String fileName) { String pdfUrl=""; try { //將讀取URL生成File File file = FileCaseUtil. URLToFile(fileName); // 打開來源 使用pdfbox中的方法 PDDocument pdfDocument = PDDocument.load(file); PDFRenderer pdfRenderer = new PDFRenderer(pdfDocument); // 提取的頁碼 int pageNumber = 0; // 以300 dpi 讀取存入 BufferedImage 對(duì)象 int dpi = 300; BufferedImage buffImage = pdfRenderer.renderImageWithDPI(pageNumber, dpi, ImageType.RGB); // 將 BufferedImage 寫入到 png // ImageIOUtil.writeImage(buffImage, "c:/temp/xx.png", dpi); //這里使用文件BufferedImage上傳 // 文件上傳 MultipartFile multipartFile =FileCaseUtil. fileCase(buffImage); log.info("PDF開始上傳:"); pdfUrl=FileUploadUtil. fileLoad(multipartFile); log.info("PDF上傳成功:{}",pdfUrl); // //文件儲(chǔ)存對(duì)象 // File outPut = new File("C:\\Users\\Administrator\\Videos\\"+ UUID.randomUUID().toString()+".jpg"); // // ImageIO.write(FrameToBufferedImage(frame), "jpg", outPut); // ImageIO.write(buffImage, "jpg",outPut); // 關(guān)閉文檔 pdfDocument.close(); //注意關(guān)閉文檔與刪除文檔的順序 //刪除臨時(shí)的file String s = FileCaseUtil.threadLocal.get(); System.out.println(s); File f=new File(s); boolean delete = f.delete(); System.out.println("文件的刪除狀態(tài)"+delete); } catch (InvalidPasswordException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return pdfUrl; } }
public static File URLToFile(String url){ log.info("讀取FastDFS上的ppt"); File file1 = new File("test.pdf"); try { URL url1 = new URL(url); FileUtils.copyURLToFile(url1,file1); } catch (IOException e) { e.printStackTrace(); } File absoluteFile = file1.getAbsoluteFile(); threadLocal.set(absoluteFile.toString()); log.info("ppt已經(jīng)存儲(chǔ)到本地"+absoluteFile.toString()); return file1; } public static BufferedImage FrameToBufferedImage(Frame frame) { //創(chuàng)建BufferedImage對(duì)象 Java2DFrameConverter converter = new Java2DFrameConverter(); BufferedImage bufferedImage = converter.getBufferedImage(frame); return bufferedImage; } public static MultipartFile fileCase(BufferedImage image){ //得到BufferedImage對(duì)象 // BufferedImage bufferedImage = JoinTwoImage.testEncode(200, 200, url); MultipartFile multipartFile= null; try { //創(chuàng)建一個(gè)ByteArrayOutputStream ByteArrayOutputStream os = new ByteArrayOutputStream(); //把BufferedImage寫入ByteArrayOutputStream ImageIO.write(image, "jpg", os); //ByteArrayOutputStream轉(zhuǎn)成InputStream InputStream input = new ByteArrayInputStream(os.toByteArray()); //InputStream轉(zhuǎn)成MultipartFile multipartFile =new MockMultipartFile("file", "file.jpg", "text/plain", input); } catch (IOException e) { e.printStackTrace(); } return multipartFile; } public static String fileLoad(MultipartFile mf) throws IOException { //上傳視頻并返回視頻地址 StorePath storePath = fastFileStorageClient.uploadFile(group,mf.getInputStream(), mf.getSize(), mf.getOriginalFilename().substring(mf.getOriginalFilename().lastIndexOf(".")+1)); //將視頻地址和項(xiàng)目id存到項(xiàng)目資料表中 String videoUrl = "http://d-godone.yyy.tech/goDone/"+storePath.getPath(); return videoUrl; }
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