优化代码：@Override public List<ProjectCountVO> projectCount(String beginTime, String endTime, Integer forceType, String projectId) { List<TaskTask> taskTaskList = this.listStatisticsTask(beginTime, endTime, forceType, projectId); if(CollectionUtil.isEmpty(taskTaskList)){ return Collections.emptyList(); } List<ProjectCountVO> result = new ArrayList<>(); Map<String, List<TaskTask>> projectTaskMap = taskTaskList.stream().collect(Collectors.groupingBy(TaskTask::getProjectId)); for (Map.Entry<String, List<TaskTask>> projectTaskEntry : projectTaskMap.entrySet()) { String currentProjectId = projectTaskEntry.getKey(); ProjectCountVO projectCountVO = new ProjectCountVO(); projectCountVO.setId(currentProjectId); // 查询项目名称 ProjectCondition queryProjectDto = new ProjectCondition(); queryProjectDto.setCompanyId(companyId); queryProjectDto.setDesignStatusList(designStatusList); queryProjectDto.setPageSize(pageSize); queryProjectDto.setUserId(userId); ResultWrapper<QueryAllProject> queryAllProjectResult = applicationServicePlatformClient.listUserProject(bspToken, bspUserId, bspUserEnvId, bspUserTenant, queryProjectDto); QueryAllProject queryAllProject = queryAllProjectResult.getData(); projectCountVO.setName(queryAllProject.getProjectName()); List<TaskTask> taskList = projectTaskEntry.getValue(); projectCountVO.setTaskCount(taskList.size()); Integer problemCount = CollectionUtil.isEmpty(taskList) ? 0 : taskList.stream().collect(Collectors.summingInt(task-> Optional.ofNullable(task.getProblemNum()).orElse(0))); projectCountVO.setProblemCount(problemCount); result.add(projectCountVO); } return result; }

可以通过以下方式来优化代码：

1. 使用Stream API代替for循环，以使代码更加简洁和易读。

2. 避免多次查询项目名称，可以先将所有项目查询出来，然后在循环中查找对应的项目名称。

3. 在计算问题数时，可以使用mapToInt来避免使用Optional，以提高性能。

重构后的代码如下：

@Override
public List<ProjectCountVO> projectCount(String beginTime, String endTime, Integer forceType, String projectId) {
    List<TaskTask> taskTaskList = this.listStatisticsTask(beginTime, endTime, forceType, projectId);
    if (CollectionUtil.isEmpty(taskTaskList)) {
        return Collections.emptyList();
    }
    ResultWrapper<QueryAllProject> queryAllProjectResult = applicationServicePlatformClient.listUserProject(bspToken, bspUserId, bspUserEnvId, bspUserTenant, new ProjectCondition(companyId, userId, designStatusList, pageSize));
    List<Project> projectList = queryAllProjectResult.getData().getProjectList();
    Map<String, String> projectIdNameMap = projectList.stream().collect(Collectors.toMap(Project::getId, Project::getProjectName));
    return taskTaskList.stream()
            .collect(Collectors.groupingBy(TaskTask::getProjectId))
            .entrySet().stream()
            .map(entry -> {
                String currentProjectId = entry.getKey();
                ProjectCountVO projectCountVO = new ProjectCountVO();
                projectCountVO.setId(currentProjectId);
                projectCountVO.setName(projectIdNameMap.get(currentProjectId));
                List<TaskTask> taskList = entry.getValue();
                projectCountVO.setTaskCount(taskList.size());
                projectCountVO.setProblemCount(taskList.stream().mapToInt(task -> task.getProblemNum() == null ? 0 : task.getProblemNum()).sum());
                return projectCountVO;
            })
            .collect(Collectors.toList());
}