diff --git a/src/main/java/com/example/copykamanotes/controller/NoteController.java b/src/main/java/com/example/copykamanotes/controller/NoteController.java
index 45fc792..48422bd 100644
--- a/src/main/java/com/example/copykamanotes/controller/NoteController.java
+++ b/src/main/java/com/example/copykamanotes/controller/NoteController.java
@@ -89,7 +89,6 @@ public class NoteController {
 
     /**
      * 下载笔记
-     * @return
      */
     @GetMapping("/notes/download")
     public ApiResponse<DownloadNoteVO> downloadNote() {
diff --git a/src/main/java/com/example/copykamanotes/service/impl/CollectionServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/CollectionServiceImpl.java
index 4bd4305..06c5849 100644
--- a/src/main/java/com/example/copykamanotes/service/impl/CollectionServiceImpl.java
+++ b/src/main/java/com/example/copykamanotes/service/impl/CollectionServiceImpl.java
@@ -18,7 +18,6 @@ import com.example.copykamanotes.service.CollectionService;
 import com.example.copykamanotes.utils.ApiResponseUtils;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.BeanUtils;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
diff --git a/src/main/java/com/example/copykamanotes/service/impl/QuestionListItemServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/QuestionListItemServiceImpl.java
index 72d7982..4da7680 100644
--- a/src/main/java/com/example/copykamanotes/service/impl/QuestionListItemServiceImpl.java
+++ b/src/main/java/com/example/copykamanotes/service/impl/QuestionListItemServiceImpl.java
@@ -33,10 +33,10 @@ import java.util.Set;
 public class QuestionListItemServiceImpl implements QuestionListItemService {
 
     private final QuestionListItemMapper questionListItemMapper;
-    private final QuestionListMapper questionListMapper;
+//    private final QuestionListMapper questionListMapper;
     private final RequestScopeData requestScopeData;
     private final NoteMapper noteMapper;
-    private final UserMapper userMapper;
+//    private final UserMapper userMapper;
 
     @Override
     public ApiResponse<List<QuestionListItemUserVO>> userGetQuestionListItems(QuestionListItemQueryParams questionListItemQueryParams) {
@@ -48,7 +48,7 @@ public class QuestionListItemServiceImpl implements QuestionListItemService {
 
         Integer questionListId = questionListItemQueryParams.getQuestionListId();
 
-        QuestionList questionList = questionListMapper.findById(questionListId);
+//        QuestionList questionList = questionListMapper.findById(questionListId);
 
         List<QuestionListItemVO> questionListItem = questionListItemMapper.findByQuestionListIdPage(questionListId, questionListItemQueryParams.getPageSize(), offset);
         List<Integer> questionIds = questionListItem.stream().map(item -> item.getQuestion().getQuestionId()).toList();
diff --git a/src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java b/src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java
index 9b91976..4abf0eb 100644
--- a/src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java
+++ b/src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java
@@ -43,7 +43,6 @@ public class UserServiceImpl implements UserService {
     private final JwtUtil jwtUtil;
     private final RequestScopeData requestScopeData;
     private final FileService fileService;
-    private final EmailService emailService;
 
     @Override
     @Transactional(rollbackFor = Exception.class)
@@ -90,7 +89,7 @@ public class UserServiceImpl implements UserService {
 
     @Override
     public ApiResponse<LoginUserVO> login(LoginRequest loginRequest) {
-        User user = null;
+        User user;
 
         if (loginRequest.getAccount() != null && !loginRequest.getAccount().isEmpty()) {
             user = userMapper.findByAccount(loginRequest.getAccount());