java处理流 图片 视频等工具

https://www.codenong.com/cs106714361/

 

1. MultipartFile转换BufferedImage

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public static void MultipartFileHeight(MultipartFile file) throws IOException {         BufferedImage image = ImageIO.read(file.getInputStream());     }

2,InputStream转换byte[]

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public static  byte[] readInputStream(InputStream inputStream) throws IOException {         byte[] buffer = new byte[1024];         int len = 0;         ByteArrayOutputStream bos = new ByteArrayOutputStream();         while((len = inputStream.read(buffer)) != -1) {             bos.write(buffer, 0, len);         }         bos.close();         return bos.toByteArray();     }

3,网络图片路径http变成流

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public static InputStream getInputStreamByGet(String url) {         try {             HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();             conn.setReadTimeout(50000);             conn.setConnectTimeout(50000);             conn.setRequestMethod("GET");             if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {                 InputStream inputStream = conn.getInputStream();                 return inputStream;             }         } catch (IOException e) {             e.printStackTrace();         }         return null;     }

 

 

4，网络地址https图片

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/**      * 网络地址https图片      * @param url      * @return      * @throws Exception      */     public static BufferedImage HttpsUtils(String url) throws Exception {        // String url = "https://visualhunt.com/photos/1/aerial-view-of-laptop-notebook-mobile-phone-and-coffee-cup-on-wooden-table-1.jpg?s=xl2";         URI uri = URI.create(url);         HttpGet httpGet = new HttpGet(uri);         HelloWord.SSLClient httpclient = new HelloWord.SSLClient();         httpclient.execute(httpGet, response -> {             HttpEntity entity = response.getEntity();             BufferedImage bufferedImage = ImageIO.read(entity.getContent());             int width = bufferedImage.getWidth();             int height = bufferedImage.getHeight();             System.out.println("width = " + width);             System.out.println("height = " + height);             //  if (entity != null) {//存本地             //   System.out.println("entity = " + entity);             //   FileCopyUtils.copy(entity.getContent(),new FileOutputStream("D:\\imgags\\test.jpg"));             //  }             BufferedImage image= ImageIO.read(entity.getContent());             return bufferedImage;         });         return null;     } public static class SSLClient extends DefaultHttpClient {     public SSLClient() throws Exception {       super();       SSLContext ctx = SSLContext.getInstance("TLS");       X509TrustManager tm = new X509TrustManager() {         @Override         public void checkClientTrusted(X509Certificate[] chain,             String authType) throws CertificateException {         }         @Override         public void checkServerTrusted(X509Certificate[] chain,             String authType) throws CertificateException {         }         @Override         public X509Certificate[] getAcceptedIssuers() {           return null;         }       };       ctx.init(null, new TrustManager[]{tm}, null);       SSLSocketFactory ssf = new SSLSocketFactory(ctx,           SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);       ClientConnectionManager ccm = this.getConnectionManager();       SchemeRegistry sr = ccm.getSchemeRegistry();       sr.register(new Scheme("https", 443, ssf));     }   }

 

 

5，获取指定视频的帧并保存为图片至指定目录

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public static void fetchFrame(String videofile, String framefile)             throws Exception {         long start = System.currentTimeMillis();         File targetFile = new File(framefile);         FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile);         ff.start();         int lenght = ff.getLengthInFrames();         int i = 0;         Frame f = null;         while (i < lenght) {             // 过滤前5帧，避免出现全黑的图片，依自己情况而定             f = ff.grabFrame();             if ((i > 48) && (f.image != null)) {                 break;             }             i++;         } //        IplImage img = f.image;         int owidth = f.imageWidth;         int oheight = f.imageHeight;         // 对截取的帧进行等比例缩放         int width = 300;         int height = (int) (((double) width / owidth) * oheight);         Java2DFrameConverter converter = new Java2DFrameConverter();         BufferedImage fecthedImage = converter.getBufferedImage(f);         BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);         bi.getGraphics().drawImage(fecthedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH),                 0, 0, null);         ImageIO.write(bi, "jpg", targetFile);         ff.stop();         System.out.println(System.currentTimeMillis() - start);     }

 

 

 

6，BufferedImage转换InputStream

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BufferedImage bi=new BufferedImage();  ByteArrayOutputStream os = new ByteArrayOutputStream();         ImageIO.write(bi, "jpg", os);         InputStream inputStream = new ByteArrayInputStream(os.toByteArray());

 

 

 

7,MultipartFile转换file

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/**      * MultipartFile 转 File      *      * @param file      * @throws Exception      */     public static File multipartFileToFile(MultipartFile file) throws Exception {         File toFile = null;         if (file.equals("") || file.getSize() <= 0) {             file = null;         } else {             InputStream ins = null;             ins = file.getInputStream();             toFile = new File(file.getOriginalFilename());             inputStreamToFile(ins, toFile);             ins.close();         }         return toFile;     }