fix

src/main/java/cn/com/qmth/scancentral/service/impl/UserServiceImpl.java

@@ -208,7 +208,11 @@ public class UserServiceImpl extends ServiceImpl<UserDao, UserEntity> implements
         }
 
         // 新增
-        UserEntity userEntity = new UserEntity();
+        UserEntity userEntity =this.getByLoginName(user.getLoginName());
+        if(userEntity!=null){
+            throw new ParameterException("用户已存在");
+        }
+        userEntity = new UserEntity();
         userEntity.setRole(user.getRole());
         userEntity.setLoginName(user.getLoginName());
         userEntity.setName(user.getLoginName());