课程发布与学习流程全解析

流程

课程发布Controller

获取课程发布信息

@ApiOperation("获取课程发布信息")
@ResponseBody
@GetMapping("/course/whole/{courseId}")
public CoursePreviewDto getPreviewInfo(@PathVariable("courseId") Long courseId) {CoursePreviewDto coursePreviewDto = new CoursePreviewDto();//获取课程预览信息CoursePublish coursePublish = coursePublishService.getCoursePublish(courseId);if (coursePublish == null) {return coursePreviewDto;}// 开始向coursePreviewDto填充数据CourseBaseInfoDto courseBaseInfoDto = new CourseBaseInfoDto();BeanUtils.copyProperties(coursePublish, courseBaseInfoDto);// 课程计划信息String teachplan = coursePublish.getTeachplan();// 转成List<TeachplanDto>List<TeachplanDto> teachplanDtos = JSON.parseArray(teachplan,TeachplanDto.class);coursePreviewDto.setCourseBase(courseBaseInfoDto);coursePreviewDto.setTeachplans(teachplanDtos);return coursePreviewDto;}

学习服务

获取课程学习视频地址

/*** 获取课程学习视频地址* @param userId 用户id* @param courseId 课程id* @param teachplanId 课程计划id* @param mediaId 媒资id* @return*/@Overridepublic RestResponse<String> getVideo(String userId, Long courseId, Long teachplanId, String mediaId) {// 查询课程信息CoursePublish coursepublish = contentServiceClient.getCoursepublish(courseId);if (coursepublish == null) {RestResponse.validfail("课程不存在");}// 远程调用内容管理服务，根据课程计划id(teachplanId)去查询课程计划信息，如果is_preview为1表示支持试学// 也可以从coursepublish对象中解析出课程计划信息去判断是否支持试学List<TeachplanDto> teachplanDtos = contentServiceClient.queryTreeNodes(courseId);TeachplanDto teachplanDto = findTeachplanDtoById(teachplanDtos, teachplanId);String isPreview = teachplanDto.getIsPreview();if (isPreview == null || "0".equals(isPreview)) {RestResponse.validfail("该课程计划不支持试看");} else if ("1".equals(isPreview)) {// 如果视频支持试学调用媒资服务查询视频的播放地址，返回return mediaServiceClient.getPlayUrlByMediaId(mediaId);}// 用户已登录if (StringUtil.isNotEmpty(userId)) {// 获取学习资格XcCourseTablesDto xcCourseTablesDto = myCourseTablesService.getLearningStatus(userId, courseId);String learnStatus = xcCourseTablesDto.getLearnStatus();if ("702002".equals(learnStatus)) {// 获取视频播放地址return RestResponse.validfail("无法学习，因为没有选课或选课后没有支付");} else if ("702003".equals(learnStatus)) {return RestResponse.validfail("已过期需要申请续费或重新支付");} else {// 有资格学习,要返回视频的播放地址// 远程调用媒资获取视频播放地址return mediaServiceClient.getPlayUrlByMediaId(mediaId);}}// 如果用户没有登录// 取出课程收费规则String charge = Objects.requireNonNull(coursepublish).getCharge();if ("201000".equals(charge)) {// 有资格学习,要返回视频的播放地址//  远程调用媒资获取视频播放地址return mediaServiceClient.getPlayUrlByMediaId(mediaId);}return RestResponse.validfail("课程需要购买");}

根据teachplanId从课程计划列表中查找对应的TeachplanDto

/*** 根据teachplanId从课程计划列表中查找对应的TeachplanDto* @param teachplanDtos 课程计划列表* @param teachplanId 要查找的课程计划ID* @return 找到的TeachplanDto对象，未找到返回null*/
private TeachplanDto findTeachplanDtoById(List<TeachplanDto> teachplanDtos, Long teachplanId) {return teachplanDtos.stream().flatMap(dto -> {// 将当前节点及其子节点合并到一个流中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);
}