diff --git a/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssResourceServiceImpl.java b/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssResourceServiceImpl.java
index 25f2031..def9900 100644
--- a/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssResourceServiceImpl.java
+++ b/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssResourceServiceImpl.java
@@ -1,9 +1,11 @@
 package org.dromara.file.service.impl;
 
+import cn.hutool.core.util.ObjectUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import lombok.RequiredArgsConstructor;
+import org.dromara.common.core.exception.ServiceException;
 import org.dromara.common.core.utils.MapstructUtils;
 import org.dromara.common.mybatis.core.page.PageQuery;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
@@ -12,6 +14,8 @@ import org.dromara.file.domain.bo.SysOssResourceBo;
 import org.dromara.file.domain.vo.SysOssResourceVo;
 import org.dromara.file.mapper.SysOssResourceMapper;
 import org.dromara.file.service.ISysOssResourceService;
+import org.dromara.system.domain.vo.SysOssVo;
+import org.dromara.system.service.ISysOssService;
 import org.springframework.stereotype.Service;
 
 import java.util.Collection;
@@ -30,6 +34,8 @@ public class SysOssResourceServiceImpl implements ISysOssResourceService {
 
     private final SysOssResourceMapper baseMapper;
 
+    private final ISysOssService ossService;
+
     /**
      * 查询【请填写功能名称】
      *
@@ -37,7 +43,7 @@ public class SysOssResourceServiceImpl implements ISysOssResourceService {
      * @return 【请填写功能名称】
      */
     @Override
-    public SysOssResourceVo queryById(Long ossId){
+    public SysOssResourceVo queryById(Long ossId) {
         return baseMapper.selectVoById(ossId);
     }
 
@@ -106,8 +112,15 @@ public class SysOssResourceServiceImpl implements ISysOssResourceService {
     /**
      * 保存前的数据校验
      */
-    private void validEntityBeforeSave(SysOssResource entity){
-        //TODO 做一些数据校验,如唯一约束
+    private void validEntityBeforeSave(SysOssResource entity) {
+        SysOssVo ossVo = ossService.getById(entity.getOssId());
+        if (ObjectUtil.isNull(ossVo)) {
+            throw new ServiceException("资源文件不存在");
+        }
+        SysOssResource ossResource = baseMapper.selectById(entity.getCatalogId());
+        if (ObjectUtil.isNull(ossResource)) {
+            throw new ServiceException("资源目录不存在");
+        }
     }
 
     /**
@@ -119,7 +132,7 @@ public class SysOssResourceServiceImpl implements ISysOssResourceService {
      */
     @Override
     public Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid) {
-        if(isValid){
+        if (isValid) {
             //TODO 做一些业务上的校验,判断是否需要校验
         }
         return baseMapper.deleteBatchIds(ids) > 0;
diff --git a/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssTextbookServiceImpl.java b/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssTextbookServiceImpl.java
index 376f93d..31a78f0 100644
--- a/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssTextbookServiceImpl.java
+++ b/ruoyi-modules/ruoyi-file/src/main/java/org/dromara/file/service/impl/SysOssTextbookServiceImpl.java
@@ -1,9 +1,11 @@
 package org.dromara.file.service.impl;
 
+import cn.hutool.core.util.ObjectUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import lombok.RequiredArgsConstructor;
+import org.dromara.common.core.exception.ServiceException;
 import org.dromara.common.core.utils.MapstructUtils;
 import org.dromara.common.mybatis.core.page.PageQuery;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
@@ -12,6 +14,8 @@ import org.dromara.file.domain.bo.SysOssTextbookBo;
 import org.dromara.file.domain.vo.SysOssTextbookVo;
 import org.dromara.file.mapper.SysOssTextbookMapper;
 import org.dromara.file.service.ISysOssTextbookService;
+import org.dromara.system.domain.vo.SysOssVo;
+import org.dromara.system.service.ISysOssService;
 import org.springframework.stereotype.Service;
 
 import java.util.Collection;
@@ -30,6 +34,8 @@ public class SysOssTextbookServiceImpl implements ISysOssTextbookService {
 
     private final SysOssTextbookMapper baseMapper;
 
+    private final ISysOssService ossService;
+
     /**
      * 查询【请填写功能名称】
      *
@@ -108,7 +114,14 @@ public class SysOssTextbookServiceImpl implements ISysOssTextbookService {
      * 保存前的数据校验
      */
     private void validEntityBeforeSave(SysOssTextbook entity){
-        //TODO 做一些数据校验,如唯一约束
+        SysOssVo ossVo = ossService.getById(entity.getOssId());
+        if (ObjectUtil.isNull(ossVo)) {
+            throw new ServiceException("教材文件不存在");
+        }
+        SysOssTextbook ossTextbook = baseMapper.selectById(entity.getCatalogId());
+        if (ObjectUtil.isNull(ossTextbook)) {
+            throw new ServiceException("教材目录不存在");
+        }
     }
 
     /**
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
index 4b0faba..26fa355 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
@@ -8,6 +8,7 @@ import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
+import org.apache.commons.codec.digest.DigestUtils;
 import org.dromara.common.core.constant.CacheNames;
 import org.dromara.common.core.domain.dto.OssDTO;
 import org.dromara.common.core.exception.ServiceException;
@@ -193,6 +194,11 @@ public class SysOssServiceImpl implements ISysOssService, OssService {
         OssClient storage = OssFactory.instance();
         UploadResult uploadResult;
         try {
+            String md5 = DigestUtils.md5Hex(file.getInputStream());
+            Long ossId = this.getIdByMd5(md5);
+            if(ObjectUtil.isNotNull(ossId)){
+               return SpringUtils.getAopProxy(this).getById(ossId);
+            }
             uploadResult = storage.uploadSuffix(file.getBytes(), suffix);
         } catch (IOException e) {
             throw new ServiceException(e.getMessage());
@@ -272,7 +278,6 @@ public class SysOssServiceImpl implements ISysOssService, OssService {
      * @param md5 文件在数据库中的唯一标识
      * @return SysOssVo 对象，包含文件信息
      */
-    @Cacheable(cacheNames = CacheNames.SYS_OSS_IDENTIFIER, key = "#md5")
     @Override
     public Long getIdByMd5(String md5) {
         SysOss sysOss = baseMapper.selectOne(new LambdaQueryWrapper<SysOss>().eq(SysOss::getFileMd5, md5));