实体类Car中必须要有String userId属性。
设置自定义表单为system/car/deptleadercheck：

然后在CarController中编写system/car/deptleadercheck对应的函数：

 @GetMapping("/deptleadercheck")
    public String deptleadercheck(String taskid, ModelMap mmap)
    {
        Task t = taskService.createTaskQuery().taskId(taskid).singleResult();
        String processId = t.getProcessInstanceId();
        ProcessInstance p = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();
        if (p != null) {
            Car apply = carService.selectCarById(Long.parseLong(p.getBusinessKey()));
            mmap.put("apply", apply);
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            mmap.put("startTime", sdf.format(apply.getStartTime()));
            mmap.put("endTime", sdf.format(apply.getEndTime()));
            mmap.put("taskid", taskid);
            mmap.put("userlist", userService.selectUserList(new SysUser()));
        }
        return prefix + "/deptleadercheck";
    }

将templates/activiti/leaveapply中deptleadercheck.html复制到car目录。
修改deptleadercheck.html中的这些，其它部分不变：

<div class="form-group">
            <label class="col-sm-3 control-label">请假人：</label>
            <div class="col-sm-8">
                <input name="userId" class="form-control" type="text" th:value="${apply.createId}" readonly>
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-3 control-label">用车地点：</label>
            <div class="col-sm-8">
                <input name="leaveType" class="form-control" type="text" th:value="${apply.address}" readonly>
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-3 control-label">起始时间：</label>
            <div class="col-sm-8">
                <div class="input-group date">
                    <input name="startTime" class="form-control" placeholder="yyyy-MM-dd HH:mm:ss" type="text" th:value="${startTime}" readonly>
                    <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                </div>
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-3 control-label">结束时间：</label>
            <div class="col-sm-8">
                <div class="input-group date">
                    <input name="endTime" class="form-control" placeholder="yyyy-MM-dd HH:mm:ss" type="text" th:value="${endTime}" readonly>
                    <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                </div>
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-3 control-label">用车原因：</label>
            <div class="col-sm-8">
                <textarea type="text" name="reason" class="form-control" th:text="${apply.reason}" readonly></textarea>
            </div>
        </div>
        <div class="form-group">
            <label class="col-xs-3 control-label">人事：</label>
            <div class="col-xs-8">
                <select class="form-control" id="hr" name="hr">
                    <option th:each="ul:${userlist}" th:value="${ul.loginName}" th:text="${ul.userName}" th:disabled="${ul.status == '1'}"></option>
                </select>
            </div>
        </div>