bug fixed

pom.xml

@@ -264,6 +264,19 @@
             <artifactId>lombok</artifactId>
             <scope>provided</scope>
         </dependency>
+
+        <!--javacv基础包，包含javacv和javacpp，必须-->
+        <dependency>
+            <groupId>org.bytedeco</groupId>
+            <artifactId>javacv</artifactId>
+            <version>1.5.5</version>
+        </dependency>
+        <!-- ffmpeg，可选 -->
+        <dependency>
+            <groupId>org.bytedeco</groupId>
+            <artifactId>ffmpeg-platform</artifactId>
+            <version>4.3.2-1.5.5</version>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/cn/wisenergy/chnmuseum/party/common/video/FrameGrabberKit.java

+package cn.wisenergy.chnmuseum.party.common.video;
+
+import org.bytedeco.javacv.FFmpegFrameGrabber;
+import org.bytedeco.javacv.Frame;
+import org.bytedeco.javacv.Java2DFrameConverter;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+
+/**
+ * 截取视频图片
+ */
+public class FrameGrabberKit {
+
+    /**
+     * 获取指定视频的帧并保存为图片至指定目录
+     */
+    public static InputStream fetchFrame(String videoUrl) throws Exception {
+        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videoUrl);
+        ff.start();
+        int lenght = ff.getLengthInFrames();
+        int i = 0;
+        int interceptionFrames = 30;//截取第几帧
+        //默认截取第50帧，如果第50帧大于视频总帧数的8成直接取长度lenght * 0.3
+        if (interceptionFrames >= lenght * 0.8) {
+            interceptionFrames = (int) (lenght * 0.3);
+        }
+        Frame f = null;
+        while (i < lenght) {
+            // 过滤 前  interceptionFrames 帧，避免出现全黑的图片，依自己情况而定
+            f = ff.grabFrame();
+            if ((i > interceptionFrames) && (f.image != null)) {
+                break;
+            }
+            i++;
+        }
+
+        int imageWidth = f.imageWidth;
+        int imageHeight = f.imageHeight;
+        // 对截取的帧进行等比例缩放
+//        int width = 800;
+//        int height = (int) (((double) width / owidth) * oheight);
+        Java2DFrameConverter converter = new Java2DFrameConverter();
+        BufferedImage fecthedImage = converter.getBufferedImage(f);
+        BufferedImage bi = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_3BYTE_BGR);
+        bi.getGraphics().drawImage(fecthedImage.getScaledInstance(imageWidth, imageHeight, Image.SCALE_SMOOTH), 0, 0, null);
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ImageIO.write(bi, "png", baos);
+        InputStream inputStream = new ByteArrayInputStream(baos.toByteArray());
+        //ff.flush();
+        ff.stop();
+        return inputStream;
+    }
+
+}

src/main/java/cn/wisenergy/chnmuseum/party/web/controller/ExhibitionBoardController.java

@@ -207,6 +207,7 @@ public class ExhibitionBoardController extends BaseController {
         if (boardCopyrightOwnerIdList != null && !boardCopyrightOwnerIdList.isEmpty()) {
             lambdaQueryWrapper.in(ExhibitionBoard::getBoardCopyrightOwnerId, boardCopyrightOwnerIdList);
         }
+        lambdaQueryWrapper.orderByDesc(ExhibitionBoard::getCreateTime);
         List<ExhibitionBoard> exhibitionBoardList = exhibitionBoardService.list();
         for (ExhibitionBoard exhibitionBoard : exhibitionBoardList) {
             if (exhibitionBoard.getBoardCopyrightOwnerId() != null) {

src/main/java/cn/wisenergy/chnmuseum/party/web/controller/FileUploadController.java

@@ -343,7 +343,7 @@ public class FileUploadController extends BaseController {
     @PostMapping(value = "/video/content/upload", headers = "content-type=multipart/form-data", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     @RequiresPermissions("file:video:content:upload")
     @ApiOperation(value = "展板视频上传", notes = "展板视频上传")
-    public Map<String, Object> uploadContentVideo(@RequestPart("file") MultipartFile[] files) throws IOException {
+    public Map<String, Object> uploadContentVideo(@RequestPart("file") MultipartFile[] files) throws Exception {
         if (files == null || files.length == 0) {
             throw new InterfaceException(RESPONSE_CODE_ENUM.SERVER_ERROR.getResultCode(), "没有文件可供上传");
         }

src/main/java/cn/wisenergy/chnmuseum/party/web/controller/LearningContentController.java

@@ -107,12 +107,12 @@ public class LearningContentController extends BaseController {
         for (String exhibitionBoardId : exhibitionBoardIdList) {
             LearningContentBoard learningContentBoard = LearningContentBoard.builder().exhibitionBoardId(exhibitionBoardId).learningContentId(learningContentId).build();
             QueryWrapper<LearningContentBoard> learningContentBoardQueryWrapper = new QueryWrapper<>();
-            queryWrapper.select("max(sortorder) as sortorder");
+            learningContentBoardQueryWrapper.select("max(sortorder) as sortorder");
             LearningContentBoard one = this.learningContentBoardService.getOne(learningContentBoardQueryWrapper);
             if (one != null && one.getSortorder() != null) {
-                learningContentBoard.setSortorder(one.getSortorder() + 1);
+                learningContent.setSortorder(one.getSortorder() + 1);
             } else {
-                learningContentBoard.setSortorder(1);
+                learningContent.setSortorder(1);
             }
             this.learningContentBoardService.save(learningContentBoard);
         }

src/main/java/cn/wisenergy/chnmuseum/party/web/controller/VideoContentController.java

@@ -175,6 +175,7 @@ public class VideoContentController extends BaseController {
         if (StringUtils.isNotBlank(videoContentCopyrightOwnerId)) {
             lambdaQueryWrapper.eq(VideoContent::getVideoContentCopyrightOwnerId, videoContentCopyrightOwnerId);
         }
+        lambdaQueryWrapper.orderByDesc(VideoContent::getCreateTime);
         List<VideoContent> videoContentList = videoContentService.list(lambdaQueryWrapper);
         return getResult(videoContentList);
     }