PDF、视频格式缩略图获取(pdf2img)

PDF、视频格式缩略图获取(pdf2img)

获取pdf缩略图

导入依赖：

        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox-tools</artifactId>
            <version>2.0.9</version>
        </dependency>

代码：

/**
     * 获取pdf缩略图
     *
     * @param path pdf绝对路径
     * @return 方便minio上传的InputStream
     */
    public static InputStream getPdfThumbnail(String path) {
        File file = new File(path);
        PDDocument doc = null;
        InputStream in = null;
        try {
            doc = PDDocument.load(file);
            PDFRenderer renderer = new PDFRenderer(doc);
            //int pageCount = doc.getNumberOfPages(); 获取pdf总页数 全转图片就要个这
            //renderImageWithDPI(pageIndex,dpi) pdf页码 Windows native DPI
            BufferedImage image = renderer.renderImageWithDPI(0, 300);
            //BufferedImage bb = resize(bi,220,156);调整大小 会压缩质量，分辨率
            in = getInputStream(image);
        } catch (IOException e) {
            log.error("出错了：" + e.getMessage());
            e.printStackTrace();
        } finally {
            try {
                doc.close();
            } catch (IOException e) {
                log.error("流关闭异常：" + e.getMessage());
                e.printStackTrace();
            }
        }
        return in;
    }

转流方法：

private static InputStream getInputStream(BufferedImage image) throws IOException {
        InputStream in = null;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(image, "png", os);
        in = new ByteArrayInputStream(os.toByteArray());
        return in;
    }

获取视频格式缩略图

导入依赖：

        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.7</version>
        </dependency>

代码：

    /**
     * 截取视频第六帧的图片
     *	防止视频前5帧是黑屏
     * @param filePath 视频路径
     * @return InputStream
     */
    public static InputStream videoImage(String filePath) {
        InputStream in = null;
        try {
            FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath);
            ff.start();
            //getLengthInFrames() 获取视频帧数量
            int ffLength = ff.getLengthInFrames();
            Frame f;
            int i = 0;
            while (i < ffLength) {
                f = ff.grabImage();
                //截取第6帧
                if ((i > 5) && (f.image != null)) {
                    in = doExecuteFrame(f);
                    break;
                }
                i++;
            }
            ff.stop();
        } catch (FFmpegFrameGrabber.Exception e) {
            e.printStackTrace();
        }
        return in;
    }

    /**
     * 截取缩略图
     *
     * @param f Frame
     */
    private static InputStream doExecuteFrame(Frame f) {
        InputStream in = null;
        if (null == f || null == f.image) {
            return in;
        }
        Java2DFrameConverter converter = new Java2DFrameConverter();
        BufferedImage bi = converter.getBufferedImage(f);
        try {
            in = getInputStream(bi);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return in;
    }