【fix sonar】SysDepartServiceImpl文件

jero-boot/jero-boot-module-system/src/main/java/com/jero/modules/system/service/impl/SysDepartServiceImpl.java

@@ -246,7 +246,7 @@ public class SysDepartServiceImpl extends ServiceImpl<SysDepartMapper, SysDepart
 		//根据部门id获取所负责部门
 		String[] codeArr = this.getMyDeptParentOrgCode(departIds);
 		if(codeArr == null || codeArr.length == 0){
-			return null;
+			return Collections.emptyList();
 		}
 		return this.baseMapper.getSubDepIdsByOrgCodes(codeArr);
 	}
@@ -292,7 +292,7 @@ public class SysDepartServiceImpl extends ServiceImpl<SysDepartMapper, SysDepart
 			}
 			return newList;
 		}
-		return null;
+		return Collections.emptyList();
 	}
 
 	/**
@@ -397,7 +397,7 @@ public class SysDepartServiceImpl extends ServiceImpl<SysDepartMapper, SysDepart
 		List<SysDepart> list = this.list(query);
 		//查找根部门
 		if(list == null || list.isEmpty()){
-			return null;
+			return new String[0];
 		}
 		String orgCode = this.getMyDeptParentNode(list);
 //		String[] codeArr = orgCode.split(",");
@@ -421,7 +421,7 @@ public class SysDepartServiceImpl extends ServiceImpl<SysDepartMapper, SysDepart
 				map.put(code,dept.getOrgCode());
 			}
 		}
-		StringBuffer parentOrgCode = new StringBuffer();
+		StringBuilder parentOrgCode = new StringBuilder();
 		//2.获取同一公司的根节点
 		for(String str : map.values()){
 			String[] arrStr = str.split(",");