diff --git a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/JwtTokenUtil.java b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/JwtTokenUtil.java
index 5701c04..f56b329 100644
--- a/biji-houdaun/src/main/java/com/test/bijihoudaun/util/JwtTokenUtil.java
+++ b/biji-houdaun/src/main/java/com/test/bijihoudaun/util/JwtTokenUtil.java
@@ -3,10 +3,14 @@ package com.test.bijihoudaun.util;
 import io.jsonwebtoken.Claims;
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import jakarta.annotation.PostConstruct;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.stereotype.Component;
 
+import java.nio.charset.StandardCharsets;
+import java.security.Key;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
@@ -21,6 +25,13 @@ public class JwtTokenUtil {
     @Value("${jwt.expiration}")
     private Long expiration;
 
+    private Key key;
+
+    @PostConstruct
+    public void init() {
+        this.key = Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8));
+    }
+
     // 从token中获取用户名
     public String getUsernameFromToken(String token) {
         return getClaimFromToken(token, Claims::getSubject);
@@ -38,7 +49,7 @@ public class JwtTokenUtil {
 
     // 为了从token中获取任何信息，我们都需要密钥
     private Claims getAllClaimsFromToken(String token) {
-        return Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
+        return Jwts.parserBuilder().setSigningKey(key).build().parseClaimsJws(token).getBody();
     }
 
     // 检查token是否过期
@@ -57,7 +68,7 @@ public class JwtTokenUtil {
     private String doGenerateToken(Map<String, Object> claims, String subject) {
         return Jwts.builder().setClaims(claims).setSubject(subject).setIssuedAt(new Date(System.currentTimeMillis()))
                 .setExpiration(new Date(System.currentTimeMillis() + expiration * 1000))
-                .signWith(SignatureAlgorithm.HS512, secret).compact();
+                .signWith(key, SignatureAlgorithm.HS512).compact();
     }
 
     // 验证token
diff --git a/biji-houdaun/src/main/resources/application.yml b/biji-houdaun/src/main/resources/application.yml
index c256703..e85a973 100644
--- a/biji-houdaun/src/main/resources/application.yml
+++ b/biji-houdaun/src/main/resources/application.yml
@@ -32,7 +32,7 @@ mybatis-plus:
 
 # JWT 配置
 jwt:
-  secret: mysecretkeymysecretkeymysecretkeymysecretkeymysecretkey # 至少256位的密钥
+  secret: V2VsbCwgSSBzdXBwb3NlIHRoYXQgaWYgeW91J3JlIHJlYWRpbmcgdGhpcywgeW91J3JlIHByZXR0eSBjdXJpb3VzLg== # 这是一个足够长的Base64编码密钥，满足HS512的要求
   expiration: 86400 # token有效期，单位秒，这里是24小时
   header: Authorization # JWT存储的请求头
   tokenHead: "Bearer " # JWT负载中拿到开头
diff --git a/biji-qianduan/src/components/HomePage.vue b/biji-qianduan/src/components/HomePage.vue
index e58ce94..8cfdf44 100644
--- a/biji-qianduan/src/components/HomePage.vue
+++ b/biji-qianduan/src/components/HomePage.vue
@@ -22,25 +22,10 @@
         popper-effect="light"
         :collapse-transition="false"
       >
-        <!-- 分组分类 -->
-        <el-sub-menu v-for="group in groupings" :key="group.id" :index="`group-${group.id}`">
-          <template #title>
-            <div class="menu-item-title">
-              <el-icon><Folder /></el-icon>
-              <span>{{ group.grouping }}</span>
-              <el-icon class="edit-icon" @click.stop="openRenameDialog(group, 'group')"><Edit /></el-icon>
-            </div>
-          </template>
-          <el-menu-item
-            v-for="sub in jb22.filter(j => +j.parentId === +group.id)"
-            :key="sub.id"
-            :index="`sub-${sub.id}`"
-            @click="selectFile(sub); selectedFile = null"
-          >
-            <el-icon><Document /></el-icon>
-            {{ sub.grouping }}
-          </el-menu-item>
-        </el-sub-menu>
+        <!-- 递归菜单组件 -->
+        <template v-for="menu in categoryTree" :key="menu.id">
+          <component :is="renderMenu(menu)" />
+        </template>
       </el-menu>
     </el-aside>
 
@@ -117,21 +102,15 @@
         <!-- 分类创建对话框 -->
         <el-dialog v-model="showCreateGroupDialog" title="新建分类" width="400px" @close="resetGroupForm">
           <el-form :model="newGroupForm" :rules="groupFormRules" ref="groupFormRef" label-width="80px">
-            <el-form-item label="分类级别">
-              <el-radio-group v-model="isGroup1">
-                <el-radio :label="true">一级分类</el-radio>
-                <el-radio :label="false">二级分类</el-radio>
-              </el-radio-group>
-            </el-form-item>
-            <el-form-item v-if="!isGroup1" label="父级分类" prop="parentId">
-              <el-select v-model="newGroupForm.parentId" placeholder="请选择父级分类">
-                <el-option
-                  v-for="group in groupings"
-                  :key="group.id"
-                  :label="group.grouping"
-                  :value="group.id"
-                ></el-option>
-              </el-select>
+            <el-form-item label="父级分类">
+              <el-cascader
+                  v-model="newGroupForm.parentId"
+                  :options="categoryCascaderOptions"
+                  :props="{ checkStrictly: true, emitPath: false }"
+                  clearable
+                  placeholder="不选则为一级分类"
+                  style="width: 100%;"
+              ></el-cascader>
             </el-form-item>
             <el-form-item label="分类名称" prop="name">
               <el-input v-model="newGroupForm.name" autocomplete="off"></el-input>
@@ -149,25 +128,15 @@
             <el-form-item label="笔记标题" prop="title">
               <el-input v-model="newNoteForm.title" autocomplete="off"></el-input>
             </el-form-item>
-            <el-form-item label="选择大分类" prop="parentId">
-              <el-select v-model="fenlei1" placeholder="请选择" @change="getjb2">
-                <el-option
-                  v-for="item in groupings"
-                  :key="item.id"
-                  :label="item.grouping"
-                  :value="item.id"
-                />
-              </el-select>
-            </el-form-item>
             <el-form-item label="选择分类" prop="groupingId">
-              <el-select v-model="newNoteForm.groupingId" placeholder="请选择">
-                <el-option
-                  v-for="group in fenlei2"
-                  :key="group.id"
-                  :label="group.grouping"
-                  :value="group.id"
-                ></el-option>
-              </el-select>
+              <el-cascader
+                  v-model="newNoteForm.groupingId"
+                  :options="categoryTree"
+                  :props="{ checkStrictly: true, emitPath: false }"
+                  clearable
+                  placeholder="请选择笔记所属分类"
+                  style="width: 100%;"
+              ></el-cascader>
             </el-form-item>
           </el-form>
           <template #footer>
@@ -187,14 +156,14 @@
 
         <!-- 导入选择分类对话框 -->
         <el-dialog v-model="showSelectGroupDialog" title="选择导入的分类" width="400px">
-          <el-select v-model="importGroupId" placeholder="请选择分类">
-            <el-option
-                v-for="group in jb22"
-                :key="group.id"
-                :label="group.grouping"
-                :value="group.id"
-            ></el-option>
-          </el-select>
+          <el-cascader
+              v-model="importGroupId"
+              :options="categoryTree"
+              :props="{ checkStrictly: true, emitPath: false }"
+              clearable
+              placeholder="请选择要导入的分类"
+              style="width: 100%;"
+          ></el-cascader>
           <template #footer>
             <el-button @click="showSelectGroupDialog = false">取消</el-button>
             <el-button type="primary" @click="confirmImport">确定</el-button>
@@ -206,15 +175,14 @@
 </template>
 
 <script setup>
-import {onMounted, ref, nextTick, watch} from 'vue';
-import {ElMessage} from 'element-plus';
+import {onMounted, ref, nextTick, watch, h, computed} from 'vue';
+import {ElMessage, ElSubMenu, ElMenuItem, ElIcon} from 'element-plus';
 import Vditor from 'vditor';
 import 'vditor/dist/index.css';
 import {
   addGroupings,
   deleteImages, deleteMarkdown,
   groupingAll,
-  groupingId,
   markdownAll, markdownList,
   Preview,
   updateMarkdown, uploadImage,
@@ -222,7 +190,7 @@ import {
   updateGroupingName,
   updateMarkdownTitle
 } from '@/api/CommonApi.js'
-import { DArrowRight, Plus, Fold, Expand, Folder, Document, Search, Edit } from "@element-plus/icons-vue";
+import { Plus, Fold, Expand, Folder, Document, Search, Edit } from "@element-plus/icons-vue";
 import { useUserStore } from '../stores/user';
 import { useRouter } from 'vue-router';
 
@@ -230,14 +198,8 @@ const userStore = useUserStore();
 const router = useRouter();
 const searchKeyword = ref('');
 
-const isGroup1=ref(true)
-// 创建新文件中大分类的信息
-const fenlei1=ref(null)
-// 创建新文件中分类信息
-const fenlei2=ref(null)
 const markdownFiles = ref([]);
-const groupings = ref([]);
-// 二级分类下的markdown文件
+const categoryTree = ref([]);
 const groupMarkdownFiles = ref({});
 const showEditor = ref(false);
 const selectedFile = ref(null);
@@ -256,7 +218,6 @@ const groupFormRef = ref(null);
 const newGroupForm = ref({ name: '', parentId: null });
 const groupFormRules = ref({
   name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }],
-  parentId: [{ required: true, message: '请选择父级分类', trigger: 'change' }],
 });
 
 const noteFormRef = ref(null);
@@ -264,37 +225,31 @@ const newNoteForm = ref({
   id: null,
   title: '',
   groupingId: null,
-  parentId: null,
   fileName: '',
   content: ''
 });
 const noteFormRules = ref({
   title: [{ required: true, message: '请输入笔记标题', trigger: 'blur' }],
-  parentId: [{ required: true, message: '请选择大分类', trigger: 'change' }],
-  groupingId: [{ required: true, message: '请选择二级分类', trigger: 'change' }],
+  groupingId: [{ required: true, message: '请选择分类', trigger: 'change' }],
 });
 
-// 创建新笔记的多级菜单
-const options=ref([])
-// 编辑笔记的数据
 const editData=ref(null)
-// 笔记中的所有图片url
 const imageUrls = ref([]);
-// 刚开始笔记中的所有图片url
 const originalImages = ref([]);
-// 分类为二级的数据
-const jb22=ref([])
 
-// Vditor 实例
 const vditor = ref(null);
 const previewHtml = ref('');
 const saveStatus = ref('空闲');
 let debounceTimer = null;
 
+const categoryCascaderOptions = computed(() => {
+  return [{ id: 0, grouping: '根分类', value: 0, label: '根分类' }, ...categoryTree.value];
+});
+
 const initVditor = () => {
   vditor.value = new Vditor('vditor', {
     height: 'calc(100vh - 120px)',
-    mode: 'ir', // 即时渲染模式
+    mode: 'ir',
     after: () => {
       if (editData.value) {
         vditor.value.setValue(editData.value.content);
@@ -312,56 +267,41 @@ const initVditor = () => {
   });
 };
 
-// 创建md文件时通过大分类获取二级分类
-const getjb2 = async () => {
-  if (fenlei1.value != null) {
-    const response = await groupingAll(fenlei1.value)
-    fenlei2.value=response.data
-  }
-}
+const buildTree = (items, parentId = 0) => {
+  return items
+      .filter(item => +item.parentId === +parentId)
+      .map(item => {
+        const children = buildTree(items, item.id);
+        return {
+          ...item,
+          value: item.id,
+          label: item.grouping,
+          children: children.length > 0 ? children : undefined,
+        };
+      });
+};
 
-// 获取所有分组
 const fetchGroupings = async () => {
   try {
-    const response = await groupingAll("")
-    const jb1 = []
-    const jb2 = []
-    for (let i = 0; i <response.data.length; i++) {
-        if (+response.data[i].parentId===0){
-          jb1.push(response.data[i])
-        }else{
-          jb2.push(response.data[i])
-        }
-    }
-    groupings.value=jb1
-    jb22.value=jb2
-    for (let i = 0; i < jb1.length; i++){
-      jb1[i].children=[]
-      options.value.push(jb1[i])
-      for (let j = 0; j < jb2.length; j++) {
-        if (+jb2[j].parentId===+jb1[i].id){
-          options.value[i].children.push(jb2[i])
-        }
-      }
-    }
+    const response = await groupingAll("");
+    const allCategories = response.data || [];
+    categoryTree.value = buildTree(allCategories);
   } catch (error) {
     console.error('获取分组失败:', error);
     ElMessage.error('获取分组失败: ' + (error.response?.data?.message || error.message));
-    groupings.value = [];
+    categoryTree.value = [];
   }
 };
 
-// 获取二级分类下的Markdown文件
 const selectFile = async (data) => {
   const promise = await markdownList(data.id);
-  groupMarkdownFiles.value=promise.data
+  groupMarkdownFiles.value = promise.data;
+  selectedFile.value = null;
 };
 
-// 获取所有Markdown文件（确保ID为字符串）
 const fetchMarkdownFiles = async () => {
   try {
     const response = await markdownAll()
-    // 确保文件ID为字符串
     markdownFiles.value = (response.data || []).map(file => ({
       ...file,
       id: String(file.id)
@@ -371,13 +311,16 @@ const fetchMarkdownFiles = async () => {
   }
 };
 
-// 创建新分类
 const createGrouping = async () => {
   if (!groupFormRef.value) return;
   await groupFormRef.value.validate(async (valid) => {
     if (valid) {
       try {
-        const response = await addGroupings(newGroupForm.value)
+        const payload = {
+          name: newGroupForm.value.name,
+          parentId: newGroupForm.value.parentId || 0
+        };
+        await addGroupings(payload);
         ElMessage.success('分类创建成功');
         showCreateGroupDialog.value = false;
         await fetchGroupings();
@@ -388,7 +331,6 @@ const createGrouping = async () => {
   });
 };
 
-// 重置新建分类表单
 const resetGroupForm = () => {
   newGroupForm.value = { name: '', parentId: null };
   if (groupFormRef.value) {
@@ -396,17 +338,27 @@ const resetGroupForm = () => {
   }
 };
 
-// 创建新笔记
 const createNote = async () => {
   if (!noteFormRef.value) return;
   await noteFormRef.value.validate(async (valid) => {
     if (valid) {
       try {
-        newNoteForm.value.fileName = newNoteForm.value.title+'.md'
-        editData.value=newNoteForm.value
-        showCreateNoteDialog.value = false
+        const groupingId = newNoteForm.value.groupingId;
+        if (!groupingId) {
+          ElMessage.error('必须选择一个分类');
+          return;
+        }
+        const payload = {
+          id: null,
+          title: newNoteForm.value.title,
+          groupingId: groupingId,
+          fileName: newNoteForm.value.title + '.md',
+          content: ''
+        };
+        editData.value = payload;
+        showCreateNoteDialog.value = false;
         showEditor.value = true;
-        selectedFile.value=editData.value
+        selectedFile.value = editData.value;
         await nextTick(() => {
           initVditor();
         });
@@ -417,16 +369,32 @@ const createNote = async () => {
   });
 };
 
-// 重置新建笔记表单
 const resetNoteForm = () => {
-  newNoteForm.value = { id: null, title: '', groupingId: null, parentId: null, fileName: '', content: '' };
-  fenlei1.value = null;
-  fenlei2.value = null;
+  newNoteForm.value = { id: null, title: '', groupingId: null, fileName: '', content: '' };
   if (noteFormRef.value) {
     noteFormRef.value.resetFields();
   }
 };
 
+const renderMenu = (item) => {
+  if (item.children && item.children.length > 0) {
+    return h(ElSubMenu, { index: `group-${item.id}` }, {
+      title: () => h('div', { class: 'menu-item-title' }, [
+        h(ElIcon, () => h(Folder)),
+        h('span', null, item.grouping),
+        h(ElIcon, { class: 'edit-icon', onClick: (e) => { e.stopPropagation(); openRenameDialog(item, 'group'); } }, () => h(Edit))
+      ]),
+      default: () => item.children.map(child => renderMenu(child))
+    });
+  }
+  return h(ElMenuItem, { index: `group-${item.id}`, onClick: () => selectFile(item) }, {
+    default: () => [
+      h(ElIcon, () => h(Document)),
+      h('span', null, item.grouping)
+    ]
+  });
+};
+
 // 选择文件预览
 const previewFile = async (file) => {
   if (file.id === null){
@@ -438,21 +406,24 @@ const previewFile = async (file) => {
     const response = await Preview(file.id)
 
     // 确保内容为字符串
-    let content = response.data;
-    if (typeof content !== 'string') {
-      // 如果返回的是对象，尝试转换为字符串
-      if (content && typeof content === 'object') {
-        content = JSON.stringify(content);
-      } else {
-        content = String(content);
-      }
-    }
+    const content = String(response.data || '');
     
     selectedFile.value = {
       ...file,
       content: content
     };
-    Vditor.preview(document.querySelector('.markdown-preview'), content);
+    await nextTick();
+    const previewElement = document.querySelector('.markdown-preview');
+    if (previewElement) {
+      Vditor.preview(previewElement, content, {
+        // 在这里提供一个基本的配置对象
+        mode: 'light', // 或者 'dark'，可以根据当前主题动态设置
+        hljs: {
+          enable: true,
+          style: 'github'
+        }
+      });
+    }
   } catch (error) {
     ElMessage.error('获取笔记内容失败: ' + error.message);
   }
diff --git a/mydatabase.db b/mydatabase.db
index 6de035f..a4bfdf7 100644
Binary files a/mydatabase.db and b/mydatabase.db differ