流程

課程發布Controller

獲取課程發布信息

@ApiOperation("獲取課程發布信息")
@ResponseBody
@GetMapping("/course/whole/{courseId}")
public CoursePreviewDto getPreviewInfo(@PathVariable("courseId") Long courseId) {CoursePreviewDto coursePreviewDto = new CoursePreviewDto();//獲取課程預覽信息CoursePublish coursePublish = coursePublishService.getCoursePublish(courseId);if (coursePublish == null) {return coursePreviewDto;}// 開始向coursePreviewDto填充數據CourseBaseInfoDto courseBaseInfoDto = new CourseBaseInfoDto();BeanUtils.copyProperties(coursePublish, courseBaseInfoDto);// 課程計劃信息String teachplan = coursePublish.getTeachplan();// 轉成List<TeachplanDto>List<TeachplanDto> teachplanDtos = JSON.parseArray(teachplan,TeachplanDto.class);coursePreviewDto.setCourseBase(courseBaseInfoDto);coursePreviewDto.setTeachplans(teachplanDtos);return coursePreviewDto;}

學習服務

獲取課程學習視頻地址

/*** 獲取課程學習視頻地址* @param userId 用戶id* @param courseId 課程id* @param teachplanId 課程計劃id* @param mediaId 媒資id* @return*/@Overridepublic RestResponse<String> getVideo(String userId, Long courseId, Long teachplanId, String mediaId) {// 查詢課程信息CoursePublish coursepublish = contentServiceClient.getCoursepublish(courseId);if (coursepublish == null) {RestResponse.validfail("課程不存在");}// 遠程調用內容管理服務，根據課程計劃id(teachplanId)去查詢課程計劃信息，如果is_preview為1表示支持試學// 也可以從coursepublish對象中解析出課程計劃信息去判斷是否支持試學List<TeachplanDto> teachplanDtos = contentServiceClient.queryTreeNodes(courseId);TeachplanDto teachplanDto = findTeachplanDtoById(teachplanDtos, teachplanId);String isPreview = teachplanDto.getIsPreview();if (isPreview == null || "0".equals(isPreview)) {RestResponse.validfail("該課程計劃不支持試看");} else if ("1".equals(isPreview)) {// 如果視頻支持試學調用媒資服務查詢視頻的播放地址，返回return mediaServiceClient.getPlayUrlByMediaId(mediaId);}// 用戶已登錄if (StringUtil.isNotEmpty(userId)) {// 獲取學習資格XcCourseTablesDto xcCourseTablesDto = myCourseTablesService.getLearningStatus(userId, courseId);String learnStatus = xcCourseTablesDto.getLearnStatus();if ("702002".equals(learnStatus)) {// 獲取視頻播放地址return RestResponse.validfail("無法學習，因為沒有選課或選課后沒有支付");} else if ("702003".equals(learnStatus)) {return RestResponse.validfail("已過期需要申請續費或重新支付");} else {// 有資格學習,要返回視頻的播放地址// 遠程調用媒資獲取視頻播放地址return mediaServiceClient.getPlayUrlByMediaId(mediaId);}}// 如果用戶沒有登錄// 取出課程收費規則String charge = Objects.requireNonNull(coursepublish).getCharge();if ("201000".equals(charge)) {// 有資格學習,要返回視頻的播放地址//  遠程調用媒資獲取視頻播放地址return mediaServiceClient.getPlayUrlByMediaId(mediaId);}return RestResponse.validfail("課程需要購買");}

根據teachplanId從課程計劃列表中查找對應的TeachplanDto

/*** 根據teachplanId從課程計劃列表中查找對應的TeachplanDto* @param teachplanDtos 課程計劃列表* @param teachplanId 要查找的課程計劃ID* @return 找到的TeachplanDto對象，未找到返回null*/
private TeachplanDto findTeachplanDtoById(List<TeachplanDto> teachplanDtos, Long teachplanId) {return teachplanDtos.stream().flatMap(dto -> {// 將當前節點及其子節點合并到一個流中Stream<TeachplanDto> stream = Stream.of(dto);if (dto.getTeachPlanTreeNodes() != null) {Stream<TeachplanDto> childrenStream = dto.getTeachPlanTreeNodes().stream();stream = Stream.concat(stream, childrenStream);}return stream;}).filter(dto -> dto.getId().equals(teachplanId)).findFirst().orElse(null);
}