修复：目录报错问题

src/main/java/com/mmc/pms/entity/DirectoryDO.java

@@ -6,10 +6,10 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 import org.apache.commons.collections4.CollectionUtils;
-import org.apache.commons.lang.StringUtils;
 
 import java.io.Serializable;
 import java.util.Date;
+import java.util.stream.Collectors;
 
 /**
  * 目录管理表(Directory)实体类
@@ -43,7 +43,7 @@ public class DirectoryDO implements Serializable {
 
   public DirectoryDO(DirectoryInfoVO param) {
     if (CollectionUtils.isNotEmpty(param.getShow())) {
-      String show = StringUtils.join(param.getShow(), ",");
+      String show = param.getShow().stream().map(Object::toString).collect(Collectors.joining(","));
       this.show = show;
     }
     this.id = param.getId();

src/main/java/com/mmc/pms/service/Impl/CategoriesServiceImpl.java

@@ -51,7 +51,7 @@ public class CategoriesServiceImpl implements CategoriesService {
     } else {
       // 获取默认目录信息
       DirectoryDO directoryDO = categoriesDao.selectDirectoryById(param.getId());
-      if (!directoryDO.getDirectoryName().equals(param.getDirectoryName())) {
+      if (directoryDO != null && !directoryDO.getDirectoryName().equals(param.getDirectoryName())) {
         return ResultBody.error(ResultEnum.DEFAULT_DIRECTORY);
       }
       categoriesDao.updateDirectory(directory);

src/main/resources/mapper/CategoriesDao.xml

@@ -25,8 +25,7 @@
         is_deleted
     </sql>
     <insert id="insertDirectory">
-        insert into directory(directory_name,
-                              `type`, show)
+        insert into directory (directory_name, `type`, `show`)
         values (#{directoryName}, #{type}, #{show})
     </insert>
     <insert id="insertClassification">
@@ -43,7 +42,7 @@
         update directory
         set directory_name = #{directoryName},
             `type`         = #{type},
-            show           = #{show}
+            `show`         = #{show}
         where id = #{id}
     </update>
     <update id="removeDirectory">