List<UserInfo> userInfoList = userInfoService.queryAll();

这是一个查询所有用户信息的代码片段，其中的 List<UserInfo> 是一个泛型集合，userInfoService 是一个服务类，queryAll() 是该服务类中的一个方法，用于查询所有用户信息并返回一个 List<UserInfo> 集合。如果需要更多的上下文信息或者代码实现细节，请提供更多的信息。

相关问题

public String add(Model model,HttpServletRequest request) throws Exception { model.addAttribute(new BookOrder()); /*查询所有的Room信息*/ List<Room> roomList = roomService.queryAllRoom(); request.setAttribute("roomList", roomList); /*查询所有的RoomType信息*/ List<RoomType> roomTypeList = roomTypeService.queryAllRoomType(); request.setAttribute("roomTypeList", roomTypeList); /*查询所有的UserInfo信息*/ List<UserInfo> userInfoList = userInfoService.queryAllUserInfo(); request.setAttribute("userInfoList", userInfoList); return "BookOrder_add"; }

这段代码是一个处理HTTP请求的方法，使用了Spring MVC框架的注解和功能。

该方法的作用是处理一个名为"add"的请求，并返回一个名为"BookOrder_add"的视图。

参数`Model model`是Spring MVC框架提供的数据模型对象，用于向视图传递数据。

参数`HttpServletRequest request`是HTTP请求对象，可以用于获取请求的相关信息。

在方法内部，首先通过`model.addAttribute(new BookOrder())`将一个新的BookOrder对象添加到数据模型中。

然后，通过调用`roomService.queryAllRoom()`、`roomTypeService.queryAllRoomType()`和`userInfoService.queryAllUserInfo()`方法，分别查询了所有的Room信息、RoomType信息和UserInfo信息，并将它们分别设置到了HttpServletRequest对象的属性中。

最后，返回字符串"BookOrder_add"作为视图名称，表示要渲染名为"BookOrder_add"的视图。

这段代码使用了Spring MVC框架提供的功能，通过注入相关的服务类（roomService、roomTypeService、userInfoService）来获取数据，并通过Model和HttpServletRequest对象将数据传递给视图渲染。

UserInfo userInfo=userProvider.get(); OrganizeEntity organize = organizeService.getById(userInfo.getDepartmentId()); TreeMap<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMap = tzglInvestmentPlanService.selectProjectDetial(params,organize); for (String key : investmentPlanProjectMap.keySet()) { List<TzglInvestmentPlanProjectModel> projectList = investmentPlanProjectMap.get(key); for (TzglInvestmentPlanProjectModel investmentPlanProject: projectList) { investmentPlanProject.setInvestmentSubjectName(generaterSwapUtil.comSelectValues(investmentPlanProject.getInvestmentSubject())); } } //按照年份分组后，降序排序 TreeMap<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMapDescending = new TreeMap<>(Comparator.reverseOrder()); investmentPlanProjectMapDescending.putAll(investmentPlanProjectMap); return ActionResult.success(investmentPlanProjectMapDescending);优化此代码

可以考虑以下优化：

1. 将获取用户信息和部门信息的代码提取出来，避免在每个方法里都重复获取。

UserInfo userInfo = userProvider.get();
OrganizeEntity organize = organizeService.getById(userInfo.getDepartmentId());

2. 使用 Stream API 和 lambda 表达式来简化代码。

TreeMap<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMap = tzglInvestmentPlanService.selectProjectDetial(params,organize);
investmentPlanProjectMap.forEach((key, projectList) -> projectList.forEach(investmentPlanProject -> investmentPlanProject.setInvestmentSubjectName(generaterSwapUtil.comSelectValues(investmentPlanProject.getInvestmentSubject()))));
TreeMap<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMapDescending = new TreeMap<>(Comparator.reverseOrder());
investmentPlanProjectMapDescending.putAll(investmentPlanProjectMap);
return ActionResult.success(investmentPlanProjectMapDescending);

3. 不需要先将 `investmentPlanProjectMap` 存放到一个 TreeMap 中，再进行降序排序。可以直接使用 Stream API 进行分组和排序。

Map<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMap = tzglInvestmentPlanService.selectProjectDetial(params,organize);
investmentPlanProjectMap.forEach((key, projectList) -> projectList.forEach(investmentPlanProject -> investmentPlanProject.setInvestmentSubjectName(generaterSwapUtil.comSelectValues(investmentPlanProject.getInvestmentSubject()))));
Map<String, List<TzglInvestmentPlanProjectModel>> investmentPlanProjectMapDescending = investmentPlanProjectMap.entrySet().stream()
        .sorted(Map.Entry.<String, List<TzglInvestmentPlanProjectModel>>comparingByKey().reversed())
        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (oldValue, newValue) -> oldValue, TreeMap::new));
return ActionResult.success(investmentPlanProjectMapDescending);