diff --git a/src/main/java/cn/teammodel/controller/EvaluationController.java b/src/main/java/cn/teammodel/controller/EvaluationController.java
index 2652c98..7a92f09 100644
--- a/src/main/java/cn/teammodel/controller/EvaluationController.java
+++ b/src/main/java/cn/teammodel/controller/EvaluationController.java
@@ -5,7 +5,7 @@ import cn.teammodel.model.dto.DeleteNodeDto;
 import cn.teammodel.model.dto.GetEvaluateTreeDto;
 import cn.teammodel.model.dto.InsertNodeDto;
 import cn.teammodel.model.dto.UpdateNodeDto;
-import cn.teammodel.model.entity.Appraise;
+import cn.teammodel.model.entity.appraise.Appraise;
 import cn.teammodel.service.EvaluationService;
 import io.swagger.annotations.ApiOperation;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -14,6 +14,7 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 import javax.annotation.Resource;
+import javax.validation.Valid;
 
 /**
  * @author winter
@@ -46,8 +47,7 @@ public class EvaluationController {
     }
     @PostMapping("deleteNode")
     @ApiOperation(value = "删除评价树的节点")
-    public R<Appraise> deleteNode(@RequestBody DeleteNodeDto deleteNodeDto) {
-        // todo: 注意删除子节点
+    public R<Appraise> deleteNode(@Valid @RequestBody DeleteNodeDto deleteNodeDto) {
         Appraise appraise = evaluationService.deleteNode(deleteNodeDto);
         return R.success(appraise);
     }
diff --git a/src/main/java/cn/teammodel/dao/EvaluationRepository.java b/src/main/java/cn/teammodel/dao/EvaluationRepository.java
index aa28cd7..2fa4a4b 100644
--- a/src/main/java/cn/teammodel/dao/EvaluationRepository.java
+++ b/src/main/java/cn/teammodel/dao/EvaluationRepository.java
@@ -1,6 +1,6 @@
 package cn.teammodel.dao;
 
-import cn.teammodel.model.entity.Appraise;
+import cn.teammodel.model.entity.appraise.Appraise;
 import com.azure.cosmos.models.PartitionKey;
 import com.azure.spring.data.cosmos.repository.CosmosRepository;
 import org.springframework.stereotype.Repository;
diff --git a/src/main/java/cn/teammodel/model/dto/DeleteNodeDto.java b/src/main/java/cn/teammodel/model/dto/DeleteNodeDto.java
index bba209c..85de9a4 100644
--- a/src/main/java/cn/teammodel/model/dto/DeleteNodeDto.java
+++ b/src/main/java/cn/teammodel/model/dto/DeleteNodeDto.java
@@ -2,6 +2,8 @@ package cn.teammodel.model.dto;
 
 import lombok.Data;
 
+import javax.validation.constraints.NotNull;
+
 /**
  * @author winter
  * @create 2023-11-22 16:16
@@ -10,6 +12,6 @@ import lombok.Data;
 public class DeleteNodeDto {
     // 检索需要,但是有 bug
     String periodId;
-    // todo: 判断空
+    @NotNull
     String id;
 }
diff --git a/src/main/java/cn/teammodel/model/entity/AppraiseRecord.java b/src/main/java/cn/teammodel/model/entity/AppraiseRecord.java
deleted file mode 100644
index c5b8afe..0000000
--- a/src/main/java/cn/teammodel/model/entity/AppraiseRecord.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package cn.teammodel.model.entity;
-
-import com.azure.spring.data.cosmos.core.mapping.Container;
-import com.azure.spring.data.cosmos.core.mapping.GeneratedValue;
-import com.azure.spring.data.cosmos.core.mapping.PartitionKey;
-import com.fasterxml.jackson.annotation.JsonInclude;
-import lombok.Data;
-import org.springframework.data.annotation.Id;
-
-/**
- * @author winter
- * @create 2023-11-27 11:02
- */
-@Container(containerName = "Student")
-@Data
-@JsonInclude(JsonInclude.Include.NON_NULL)
-public class AppraiseRecord {
-    @Id
-    @GeneratedValue
-    private String id;
-    /**
-     * 分区键: AppraiseRecord-{schoolId}
-     */
-    @PartitionKey
-    private String code;
-    /**
-     * 学校 Id
-     */
-    private String schoolId;
-    /**
-     * 学段 id
-     */
-    private String periodId;
-
-
-}
diff --git a/src/main/java/cn/teammodel/model/entity/Appraise.java b/src/main/java/cn/teammodel/model/entity/appraise/Appraise.java
similarity index 81%
rename from src/main/java/cn/teammodel/model/entity/Appraise.java
rename to src/main/java/cn/teammodel/model/entity/appraise/Appraise.java
index 85ef5ba..e57452e 100644
--- a/src/main/java/cn/teammodel/model/entity/Appraise.java
+++ b/src/main/java/cn/teammodel/model/entity/appraise/Appraise.java
@@ -1,5 +1,6 @@
-package cn.teammodel.model.entity;
+package cn.teammodel.model.entity.appraise;
 
+import cn.teammodel.model.entity.BaseItem;
 import com.azure.spring.data.cosmos.core.mapping.Container;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import lombok.Data;
@@ -16,7 +17,7 @@ import java.util.List;
 @Container(containerName = "School")
 @Data
 @JsonInclude(JsonInclude.Include.NON_NULL)
-public class Appraise extends BaseItem{
+public class Appraise extends BaseItem {
     /**
     * 学校 Id
     */
diff --git a/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecord.java b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecord.java
new file mode 100644
index 0000000..ff9cf9b
--- /dev/null
+++ b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecord.java
@@ -0,0 +1,28 @@
+package cn.teammodel.model.entity.appraise;
+
+import cn.teammodel.model.entity.BaseItem;
+import com.azure.spring.data.cosmos.core.mapping.Container;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import java.util.List;
+
+/**
+ * 一个学生在一个学年(学校+学年 = 分区键)的所有评价记录
+ * @author winter
+ * @create 2023-11-27 11:02
+ */
+@EqualsAndHashCode(callSuper = true)
+@Container(containerName = "Student")
+@Data
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class AppraiseRecord extends BaseItem {
+    /**
+     * 学段 id
+     */
+    private String periodId;
+    private String studentId;
+    private List<AppraiseRecordItem> nodes;
+
+}
diff --git a/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecordItem.java b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecordItem.java
new file mode 100644
index 0000000..d852db4
--- /dev/null
+++ b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseRecordItem.java
@@ -0,0 +1,17 @@
+package cn.teammodel.model.entity.appraise;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.Data;
+
+/**
+ * 评价项
+ * @author winter
+ * @create 2023-11-27 16:47
+ */
+
+@Data
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class AppraiseRecordItem {
+    private String id;
+    private String appraiseNodeId;
+}
diff --git a/src/main/java/cn/teammodel/model/entity/AppraiseTreeNode.java b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseTreeNode.java
similarity index 94%
rename from src/main/java/cn/teammodel/model/entity/AppraiseTreeNode.java
rename to src/main/java/cn/teammodel/model/entity/appraise/AppraiseTreeNode.java
index b5e92e5..5927e9e 100644
--- a/src/main/java/cn/teammodel/model/entity/AppraiseTreeNode.java
+++ b/src/main/java/cn/teammodel/model/entity/appraise/AppraiseTreeNode.java
@@ -1,4 +1,4 @@
-package cn.teammodel.model.entity;
+package cn.teammodel.model.entity.appraise;
 
 import com.fasterxml.jackson.annotation.JsonFormat;
 import com.fasterxml.jackson.annotation.JsonInclude;
diff --git a/src/main/java/cn/teammodel/model/entity/school/Semester.java b/src/main/java/cn/teammodel/model/entity/school/Semester.java
new file mode 100644
index 0000000..647cfd9
--- /dev/null
+++ b/src/main/java/cn/teammodel/model/entity/school/Semester.java
@@ -0,0 +1,26 @@
+package cn.teammodel.model.entity.school;
+
+import lombok.Data;
+
+/**
+ * 学期(标记了学期的开始与结束)
+ * @author winter
+ * @create 2023-11-28 10:39
+ */
+@Data
+public class Semester {
+    private String id;
+    private String name;
+    /**
+    * start = 1 则代表一年开始的学期
+    */
+    private Integer start;
+    /**
+    * 开始的月份
+    */
+    private Integer month;
+    /**
+    * 开始的日
+    */
+    private Integer day;
+}
diff --git a/src/main/java/cn/teammodel/security/service/PermissionService.java b/src/main/java/cn/teammodel/security/service/PermissionService.java
index 72c432e..79e900f 100644
--- a/src/main/java/cn/teammodel/security/service/PermissionService.java
+++ b/src/main/java/cn/teammodel/security/service/PermissionService.java
@@ -3,7 +3,7 @@ package cn.teammodel.security.service;
 import java.util.Set;
 
 import cn.teammodel.model.entity.User;
-import cn.teammodel.security.utils.SecurityUtils;
+import cn.teammodel.security.utils.SecurityUtil;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.security.core.Authentication;
 import org.springframework.stereotype.Service;
@@ -48,7 +48,7 @@ public class PermissionService
         {
             return false;
         }
-        Authentication authentication = SecurityUtils.getAuthentication();
+        Authentication authentication = SecurityUtil.getAuthentication();
         if (authentication == null || CollectionUtils.isEmpty(authentication.getAuthorities()))
         {
             return false;
@@ -68,7 +68,7 @@ public class PermissionService
         {
             return false;
         }
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
         if (loginUser == null || CollectionUtils.isEmpty(loginUser.getPermissions()))
         {
             return false;
@@ -99,7 +99,7 @@ public class PermissionService
         {
             return false;
         }
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
         if (loginUser == null || CollectionUtils.isEmpty(loginUser.getPermissions()))
         {
             return false;
@@ -126,7 +126,7 @@ public class PermissionService
         if (StringUtils.isEmpty(role)) {
             return false;
         }
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
         if (loginUser == null || CollectionUtils.isEmpty(loginUser.getRoles()))
         {
             return false;
@@ -157,7 +157,7 @@ public class PermissionService
         {
             return false;
         }
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
         if (loginUser == null || CollectionUtils.isEmpty(loginUser.getRoles()))
         {
             return false;
diff --git a/src/main/java/cn/teammodel/security/utils/SecurityUtils.java b/src/main/java/cn/teammodel/security/utils/SecurityUtil.java
similarity index 95%
rename from src/main/java/cn/teammodel/security/utils/SecurityUtils.java
rename to src/main/java/cn/teammodel/security/utils/SecurityUtil.java
index b3dcf5f..448c60b 100644
--- a/src/main/java/cn/teammodel/security/utils/SecurityUtils.java
+++ b/src/main/java/cn/teammodel/security/utils/SecurityUtil.java
@@ -1,107 +1,107 @@
-package cn.teammodel.security.utils;
-
-import cn.teammodel.config.exception.ServiceException;
-import cn.teammodel.model.entity.User;
-import cn.teammodel.model.entity.TmdUserDetail;
-import org.springframework.http.HttpStatus;
-import org.springframework.security.core.Authentication;
-import org.springframework.security.core.context.SecurityContextHolder;
-import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
-
-/**
- * 安全服务工具类
- * 
- * @author winter
- */
-public class SecurityUtils
-{
-    /**
-     * 用户ID
-     **/
-    public static String getUserId()
-    {
-        try
-        {
-            return getLoginUser().getId();
-        }
-        catch (Exception e)
-        {
-            throw new ServiceException( HttpStatus.UNAUTHORIZED.value(), "获取用户ID异常");
-        }
-    }
-
-
-    /**
-     * 获取用户账户
-     **/
-    public static String getUsername()
-    {
-        try
-        {
-            return getLoginUser().getName();
-        }
-        catch (Exception e)
-        {
-            throw new ServiceException(HttpStatus.UNAUTHORIZED.value(), "获取用户账户异常");
-        }
-    }
-
-    /**
-     * 获取用户
-     **/
-    public static User getLoginUser()
-    {
-        try
-        {
-            return ((TmdUserDetail) getAuthentication().getPrincipal()).getUser();
-        }
-        catch (Exception e)
-        {
-            throw new ServiceException(HttpStatus.UNAUTHORIZED.value(), "获取用户信息异常");
-        }
-    }
-
-    /**
-     * 获取Authentication
-     */
-    public static Authentication getAuthentication()
-    {
-        return SecurityContextHolder.getContext().getAuthentication();
-    }
-
-    /**
-     * 生成BCryptPasswordEncoder密码
-     *
-     * @param password 密码
-     * @return 加密字符串
-     */
-    public static String encryptPassword(String password)
-    {
-        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
-        return passwordEncoder.encode(password);
-    }
-
-    /**
-     * 判断密码是否相同
-     *
-     * @param rawPassword 真实密码
-     * @param encodedPassword 加密后字符
-     * @return 结果
-     */
-    public static boolean matchesPassword(String rawPassword, String encodedPassword)
-    {
-        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
-        return passwordEncoder.matches(rawPassword, encodedPassword);
-    }
-
-    /**
-     * 是否为管理员
-     * 
-     * @param userId 用户ID
-     * @return 结果
-     */
-    public static boolean isAdmin(Long userId)
-    {
-        return userId != null && 1L == userId;
-    }
-}
+package cn.teammodel.security.utils;
+
+import cn.teammodel.config.exception.ServiceException;
+import cn.teammodel.model.entity.User;
+import cn.teammodel.model.entity.TmdUserDetail;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+
+/**
+ * 安全服务工具类
+ * 
+ * @author winter
+ */
+public class SecurityUtil
+{
+    /**
+     * 用户ID
+     **/
+    public static String getUserId()
+    {
+        try
+        {
+            return getLoginUser().getId();
+        }
+        catch (Exception e)
+        {
+            throw new ServiceException( HttpStatus.UNAUTHORIZED.value(), "获取用户ID异常");
+        }
+    }
+
+
+    /**
+     * 获取用户账户
+     **/
+    public static String getUsername()
+    {
+        try
+        {
+            return getLoginUser().getName();
+        }
+        catch (Exception e)
+        {
+            throw new ServiceException(HttpStatus.UNAUTHORIZED.value(), "获取用户账户异常");
+        }
+    }
+
+    /**
+     * 获取用户
+     **/
+    public static User getLoginUser()
+    {
+        try
+        {
+            return ((TmdUserDetail) getAuthentication().getPrincipal()).getUser();
+        }
+        catch (Exception e)
+        {
+            throw new ServiceException(HttpStatus.UNAUTHORIZED.value(), "获取用户信息异常");
+        }
+    }
+
+    /**
+     * 获取Authentication
+     */
+    public static Authentication getAuthentication()
+    {
+        return SecurityContextHolder.getContext().getAuthentication();
+    }
+
+    /**
+     * 生成BCryptPasswordEncoder密码
+     *
+     * @param password 密码
+     * @return 加密字符串
+     */
+    public static String encryptPassword(String password)
+    {
+        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
+        return passwordEncoder.encode(password);
+    }
+
+    /**
+     * 判断密码是否相同
+     *
+     * @param rawPassword 真实密码
+     * @param encodedPassword 加密后字符
+     * @return 结果
+     */
+    public static boolean matchesPassword(String rawPassword, String encodedPassword)
+    {
+        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
+        return passwordEncoder.matches(rawPassword, encodedPassword);
+    }
+
+    /**
+     * 是否为管理员
+     * 
+     * @param userId 用户ID
+     * @return 结果
+     */
+    public static boolean isAdmin(Long userId)
+    {
+        return userId != null && 1L == userId;
+    }
+}
diff --git a/src/main/java/cn/teammodel/service/EvaluationService.java b/src/main/java/cn/teammodel/service/EvaluationService.java
index 092ddb8..f74472c 100644
--- a/src/main/java/cn/teammodel/service/EvaluationService.java
+++ b/src/main/java/cn/teammodel/service/EvaluationService.java
@@ -4,8 +4,8 @@ import cn.teammodel.model.dto.DeleteNodeDto;
 import cn.teammodel.model.dto.GetEvaluateTreeDto;
 import cn.teammodel.model.dto.InsertNodeDto;
 import cn.teammodel.model.dto.UpdateNodeDto;
-import cn.teammodel.model.entity.Appraise;
-import cn.teammodel.model.entity.AppraiseTreeNode;
+import cn.teammodel.model.entity.appraise.Appraise;
+import cn.teammodel.model.entity.appraise.AppraiseTreeNode;
 
 import java.util.List;
 
@@ -25,7 +25,6 @@ public interface EvaluationService {
      * 递归扁平化树
      * @param trees: 树的列表
      * @param nodes: 扁平化后的节点列表
-     * @return: void
      * @author: winter
      * @date: 2023/11/21 16:40
      * @description:
diff --git a/src/main/java/cn/teammodel/service/impl/EvaluationServiceImpl.java b/src/main/java/cn/teammodel/service/impl/EvaluationServiceImpl.java
index 9bc96cc..d30bf37 100644
--- a/src/main/java/cn/teammodel/service/impl/EvaluationServiceImpl.java
+++ b/src/main/java/cn/teammodel/service/impl/EvaluationServiceImpl.java
@@ -9,10 +9,10 @@ import cn.teammodel.model.dto.DeleteNodeDto;
 import cn.teammodel.model.dto.GetEvaluateTreeDto;
 import cn.teammodel.model.dto.InsertNodeDto;
 import cn.teammodel.model.dto.UpdateNodeDto;
-import cn.teammodel.model.entity.Appraise;
-import cn.teammodel.model.entity.AppraiseTreeNode;
+import cn.teammodel.model.entity.appraise.Appraise;
+import cn.teammodel.model.entity.appraise.AppraiseTreeNode;
 import cn.teammodel.model.entity.User;
-import cn.teammodel.security.utils.SecurityUtils;
+import cn.teammodel.security.utils.SecurityUtil;
 import cn.teammodel.service.EvaluationService;
 import com.azure.spring.data.cosmos.core.CosmosTemplate;
 import org.apache.commons.lang3.ObjectUtils;
@@ -43,7 +43,7 @@ public class EvaluationServiceImpl implements EvaluationService {
     private Appraise findAppraise(String periodId) {
         // 默认学区为 default
         periodId = StringUtils.isEmpty(periodId) ? "default" : periodId;
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
         String schoolId = loginUser.getSchoolId();
 
         // 拿到要新增节点的原始数据
@@ -102,7 +102,7 @@ public class EvaluationServiceImpl implements EvaluationService {
     @Override
     public Appraise insertNode(InsertNodeDto insertNodeDto) {
         Appraise appraise = findAppraise(insertNodeDto.getPeriodId());
-        User loginUser = SecurityUtils.getLoginUser();
+        User loginUser = SecurityUtil.getLoginUser();
 
         List<AppraiseTreeNode> originNodes = appraise.getNodes();
         // 拷贝数据到新节点
diff --git a/src/main/java/cn/teammodel/utils/SchoolDateUtil.java b/src/main/java/cn/teammodel/utils/SchoolDateUtil.java
new file mode 100644
index 0000000..b2ac09e
--- /dev/null
+++ b/src/main/java/cn/teammodel/utils/SchoolDateUtil.java
@@ -0,0 +1,40 @@
+package cn.teammodel.utils;
+
+import cn.teammodel.model.entity.school.Semester;
+
+import java.time.LocalDate;
+import java.util.List;
+
+/**
+ * 学校中年级,学年,日期相关的工具类
+ * @author winter
+ * @create 2023-11-28 10:15
+ */
+public class SchoolDateUtil {
+
+    /**
+    * 通过当前时间与学校的学期安排获取当前的学年
+     * 学校学期:
+     * <pre>
+     * "semesters": [
+     *         {
+     *           "name": "下学期",
+     *           "start": 0,
+     *           "month": 3,
+     *           "day": 1,
+     *           "id": "2"
+     *         },
+     *         {
+     *           "name": "上学期",
+     *           "start": 1,
+     *           "month": 9,
+     *           "day": 1,
+     *           "id": "1"
+     *         }
+     *         <pre/>
+    */
+    public static String getSemesterByNow(List<Semester> semesters, LocalDate date) {
+        return "";
+    }
+
+}
diff --git a/src/test/java/cn/teammodel/TeamModelExtensionApplicationTests.java b/src/test/java/cn/teammodel/TeamModelExtensionApplicationTests.java
index 6165015..565b174 100644
--- a/src/test/java/cn/teammodel/TeamModelExtensionApplicationTests.java
+++ b/src/test/java/cn/teammodel/TeamModelExtensionApplicationTests.java
@@ -3,8 +3,8 @@ package cn.teammodel;
 import cn.teammodel.dao.EvaluationRepository;
 import cn.teammodel.dao.StudentRepository;
 import cn.teammodel.manager.DingAlertNotifier;
-import cn.teammodel.model.entity.Appraise;
-import cn.teammodel.model.entity.AppraiseTreeNode;
+import cn.teammodel.model.entity.appraise.Appraise;
+import cn.teammodel.model.entity.appraise.AppraiseTreeNode;
 import cn.teammodel.service.EvaluationService;
 import cn.teammodel.service.impl.EvaluationServiceImpl;
 import com.azure.cosmos.models.PartitionKey;
@@ -87,4 +87,16 @@ class TeamModelExtensionApplicationTests {
         evaluationRepository.save(saved);
     }
 
+    @Test
+    public void testSave() {
+        Appraise appraise = new Appraise();
+        appraise.setId("1b69e5d1-5c22-453a-9f67-ed82e1075b62");
+        appraise.setCode("Appraise");
+        appraise.setPeriodId("default");
+        appraise.setSchoolId("test_modified");
+        //System.out.println(cosmosTemplate.insert(appraise, PK.of(PK.PK_APPRAISE)));
+        // 使用这个似乎必须要有 id,因为是依据 id 判断是否存在 (由 id 和 partitionKey 唯一定位)
+        cosmosTemplate.upsert(appraise);
+    }
+
 }
diff --git a/src/test/java/cn/teammodel/TestWithoutSpring.java b/src/test/java/cn/teammodel/TestWithoutSpring.java
index 1216416..afb9955 100644
--- a/src/test/java/cn/teammodel/TestWithoutSpring.java
+++ b/src/test/java/cn/teammodel/TestWithoutSpring.java
@@ -1,7 +1,7 @@
 package cn.teammodel;
 
-import cn.teammodel.model.entity.Appraise;
-import cn.teammodel.model.entity.AppraiseTreeNode;
+import cn.teammodel.model.entity.appraise.Appraise;
+import cn.teammodel.model.entity.appraise.AppraiseTreeNode;
 import cn.teammodel.service.impl.EvaluationServiceImpl;
 import com.dingtalk.api.DefaultDingTalkClient;
 import com.dingtalk.api.DingTalkClient;