文章目录

• • 概要
  • 整体架构流程
  • 技术细节
  • 小结

概要

需求分析以及接口设计

技术细节

1.Controller层:

java">private final ILearningLessonService iLearningLessonService;/*** 分页查询我的课表* @param pageQuery* @return*/@ApiOperation("分页查询我的课表")@GetMapping("/page")public PageDTO<LearningLessonVO> queryMyLessons(PageQuery pageQuery){return iLearningLessonService.queryMyLessons(pageQuery);}

2.Service层:

java">/*** 分页查询我的课表* @param pageQuery* @return*/public PageDTO<LearningLessonVO> queryMyLessons(PageQuery pageQuery) {//1.获取用户idLong userId = UserContext.getUser();//2.分页查询课程信息Page<LearningLesson> page = lambdaQuery().eq(LearningLesson::getUserId, userId).page(pageQuery.toMpPage("latest_learn_time", false));List<LearningLesson> records = page.getRecords();if (CollUtils.isEmpty(records)){return PageDTO.empty(page);}//3.将po封装成vo//3.1远程调用课程服务查询课程信息,获取剩余字段Set<Long> ids = records.stream().map(LearningLesson::getCourseId).collect(Collectors.toSet());List<CourseSimpleInfoDTO> courseInfoList = courseClient.getSimpleInfoList(ids);if (courseInfoList.isEmpty()){throw new BizIllegalException("课程不存在");}//将课程信息转为map,以便循环时一一对应课表的信息Map<Long, CourseSimpleInfoDTO> cInfoDTOMap = courseInfoList.stream().collect(Collectors.toMap(CourseSimpleInfoDTO::getId, c -> c));ArrayList<LearningLessonVO> learningLessonVOS = new ArrayList<>();for (LearningLesson lesson : records) {//3.2遍历课表循环每个课程进行封装LearningLessonVO learningLessonVO = BeanUtils.copyBean(lesson, LearningLessonVO.class);//3.3填充剩余字段//通过key(课程id)获取到该课程的详细信息CourseSimpleInfoDTO courseSimpleInfoDTO = cInfoDTOMap.get(lesson.getCourseId());learningLessonVO.setCourseName(courseSimpleInfoDTO.getName());learningLessonVO.setCourseCoverUrl(courseSimpleInfoDTO.getCoverUrl());learningLessonVO.setSections(courseSimpleInfoDTO.getSectionNum());learningLessonVOS.add(learningLessonVO);}//4.返回return PageDTO.of(page,learningLessonVOS);}

效果展示