3.17 图片存储优化，redis保存session信息，实现持久化登录状态

pom.xml

@@ -74,6 +74,11 @@
             <artifactId>caffeine</artifactId>
             <version>3.1.8</version>
         </dependency>
+        <!-- Spring Session + Redis -->
+        <dependency>
+            <groupId>org.springframework.session</groupId>
+            <artifactId>spring-session-data-redis</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-configuration-processor</artifactId>

sql/create_table.sql

@@ -61,4 +61,4 @@ CREATE INDEX idx_reviewStatus ON picture (review_status);
 ALTER TABLE picture
     -- 添加新列
     ADD COLUMN original_url varchar(512) NULL COMMENT '原图 url',
-    ADD COLUMN thumbnail_url varchar(512) NULL COMMENT '缩略图 url';
+    ADD COLUMN thumbnail_url varchar(512) NULL COMMENT '缩略图 url';

src/main/java/edu/whut/smilepicturebackend/controller/PictureController.java

@@ -40,7 +40,8 @@ public class PictureController {
 
 
     /**
-     * 上传图片（可重新上传）
+     * 上传图片（可重新上传），前端选中图片就会调用该接口，无需前端点'创建'按钮！
+     *
      */
     @PostMapping("/upload")
 //    @AuthCheck(mustRole = UserConstant.ADMIN_ROLE)
@@ -79,20 +80,7 @@ public class PictureController {
             throw new BusinessException(ErrorCode.PARAMS_ERROR);
         }
         User loginUser = userService.getLoginUser(request);
-        Long id = deleteRequest.getId();
+        pictureService.deletePicture(deleteRequest.getId(), loginUser);
-        //判断用户是否存在
-        Picture oldPicture = pictureService.getById(id);
-        ThrowUtils.throwIf(oldPicture == null, ErrorCode.NOT_FOUND_ERROR);
-        // 仅本人或者管理员可删除
-        if (!oldPicture.getUserId().equals(loginUser.getId())
-                && !userService.isAdmin(loginUser)) {
-            throw new BusinessException(ErrorCode.NO_AUTH_ERROR);
-        }
-        // 操作数据库
-        boolean result = pictureService.removeById(id);
-        ThrowUtils.throwIf(!result, ErrorCode.OPERATION_ERROR);
-        //清理图片资源
-        pictureService.clearPictureFile(oldPicture);
         return ResultUtils.success(true);
     }
 
@@ -209,7 +197,7 @@ public class PictureController {
     }
 
     /**
-     * 编辑图片（给用户使用）
+     * 编辑图片（给用户使用）或创建图片时，编辑标签、分类的时候
      */
     @PostMapping("/edit")
     public BaseResponse<Boolean> editPicture(@RequestBody PictureEditRequest pictureEditRequest, HttpServletRequest request) {

src/main/java/edu/whut/smilepicturebackend/manager/CosManager.java

@@ -1,15 +1,19 @@
 package edu.whut.smilepicturebackend.manager;
 import cn.hutool.core.io.FileUtil;
+import cn.hutool.core.util.StrUtil;
 import com.qcloud.cos.COSClient;
 import com.qcloud.cos.model.*;
 import com.qcloud.cos.model.ciModel.persistence.PicOperations;
 import edu.whut.smilepicturebackend.config.CosClientConfig;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
 
 import javax.annotation.Resource;
 import java.io.File;
 import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -19,6 +23,7 @@ import java.util.List;
  */
 @Component
 @RequiredArgsConstructor
+@Slf4j
 public class CosManager {
 
     private final CosClientConfig cosClientConfig;
@@ -155,11 +160,45 @@ public class CosManager {
 
 
     /**
-     * 删除对象
+     * 删除对象 https://cloud.tencent.com/document/product/436/65939
-     *
+     * @param url
-     * @param key 唯一键
      */
-    public void deleteObject(String key) {
+    public void deleteIfNotBlank(String url) {
-        cosClient.deleteObject(cosClientConfig.getBucket(), key);
+        if (StrUtil.isBlank(url)) {
+            return;
+        }
+        try {
+            // 1. 解析 URL → 得到对象 key
+            String key = extractUploadPath(url);
+            if (StrUtil.isBlank(key)) {
+                log.warn("无法从 URL 解析出 COS 对象 key，跳过删除: {}", url);
+                return;
+            }
+            // 2. 调用 COS SDK 删除
+            log.info("清理图片中... {}", key);
+            cosClient.deleteObject(cosClientConfig.getBucket(), key);
+        } catch (IllegalArgumentException e) {
+            // URL 格式非法或解析失败时给出警告，不中断业务
+            log.warn("删除图片失败：URL 解析异常，url={}", url, e);
+        }
     }
+
+    /**
+     *  从完整 COS URL 中解析出对象 key（即 uploadPath）
+     *
+     *  @param originalUrl  形如 https://bucket.cos.xxx/my/prefix/file.png
+     *  @return             my/prefix/file.png
+     */
+    public static String extractUploadPath(String originalUrl) {
+        try {
+            // 1. 直接拿 URI 的 path 部分，例如  "//smile-picture/public/.../xxx.png"
+            String path = new URI(originalUrl).getPath();
+
+            // 2. 去掉所有前导斜杠，得到真正的 COS 对象 key
+            return path.replaceFirst("^/+", "");   // => smile-picture/public/.../xxx.png
+        } catch (URISyntaxException e) {
+            throw new IllegalArgumentException("非法的 COS URL: " + originalUrl, e);
+        }
+    }
+
 }

src/main/java/edu/whut/smilepicturebackend/manager/upload/PictureUploadTemplate.java

@@ -135,6 +135,7 @@ public abstract class PictureUploadTemplate {
         uploadPictureResult.setPicColor(imageInfo.getAve());
         // 设置缩略图地址
         uploadPictureResult.setThumbnailUrl(cosClientConfig.getHost() + "/" + thumbnailCiObject.getKey());
+        //设置原图地址
         uploadPictureResult.setOriginalUrl(cosClientConfig.getHost() + "/" + uploadPath);
         // 返回可访问的地址
         return uploadPictureResult;

src/main/java/edu/whut/smilepicturebackend/service/PictureService.java

@@ -43,6 +43,14 @@ public interface PictureService extends IService<Picture> {
      */
     LambdaQueryWrapper<Picture> getQueryWrapper(PictureQueryRequest pictureQueryRequest);
 
+    /**
+     * 删除图片
+     *
+     * @param pictureId
+     * @param loginUser
+     */
+    void deletePicture(long pictureId, User loginUser);
+
     /**
      * 获取图片包装类（单条）
      *

src/main/java/edu/whut/smilepicturebackend/service/impl/PictureServiceImpl.java

@@ -40,6 +40,7 @@ import org.jsoup.select.Elements;
 import org.springframework.beans.BeanUtils;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.DigestUtils;
 
 
@@ -84,19 +85,19 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
             ThrowUtils.throwIf(introduction.length() > 800, ErrorCode.PARAMS_ERROR, "简介过长");
         }
     }
+
     @Override
     public PictureVO uploadPicture(Object inputSource, PictureUploadRequest pictureUploadRequest, User loginUser) {
         // 校验参数
         ThrowUtils.throwIf(loginUser == null, ErrorCode.NO_AUTH_ERROR);
 
-        // 判断是新增还是删除
+        // 判断是创建还是替换
-        Long pictureId = null;
+        Long pictureId = pictureUploadRequest == null ? null : pictureUploadRequest.getId();
-        if (pictureUploadRequest != null) {
+        Picture oldPicture = null;
-            pictureId = pictureUploadRequest.getId();
+
-        }
         // 如果是更新，判断图片是否存在
         if (pictureId != null) {
-            Picture oldPicture = this.getById(pictureId);
+            oldPicture = this.getById(pictureId);
             ThrowUtils.throwIf(oldPicture == null, ErrorCode.NOT_FOUND_ERROR, "图片不存在");
             // 仅本人或管理员可编辑图片
             if (!oldPicture.getUserId().equals(loginUser.getId()) && !userService.isAdmin(loginUser)) {
@@ -112,8 +113,9 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
         if (inputSource instanceof String) {
             pictureUploadTemplate = urlPictureUpload;
         }
+        //上传到腾讯云COS上
         UploadPictureResult uploadPictureResult = pictureUploadTemplate.uploadPicture(inputSource, uploadPathPrefix);
-        // 构造要入库的图片信息
+        // 构造要入库的图片信息，将图片信息存入数据库中。
         Picture picture = new Picture();
         // 复制同名属性（url、name、picSize、picWidth、picHeight、picScale、picFormat）
         BeanUtils.copyProperties(uploadPictureResult, picture);
@@ -135,8 +137,11 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
             picture.setEditTime(new Date());
         }
         boolean result = this.saveOrUpdate(picture);
-        //todo:如果是更新，清理旧的图片
         ThrowUtils.throwIf(!result, ErrorCode.OPERATION_ERROR, "图片上传失败，数据库操作失败");
+        //如果是更新，清理旧的图片
+        if (oldPicture != null) {
+            this.clearPictureFile(oldPicture);
+        }
         return PictureVO.objToVo(picture);
     }
 
@@ -190,6 +195,22 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
         return qw;
     }
 
+    @Override
+    public void deletePicture(long pictureId, User loginUser) {
+        Picture oldPicture = this.getById(pictureId);
+        ThrowUtils.throwIf(oldPicture == null, ErrorCode.NOT_FOUND_ERROR);
+        // 仅本人或者管理员可删除
+        if (!oldPicture.getUserId().equals(loginUser.getId())
+                && !userService.isAdmin(loginUser)) {
+            throw new BusinessException(ErrorCode.NO_AUTH_ERROR);
+        }
+        // 操作数据库
+        boolean result = this.removeById(pictureId);
+        ThrowUtils.throwIf(!result, ErrorCode.OPERATION_ERROR);
+        //清理图片资源
+        this.clearPictureFile(oldPicture);
+    }
+
     @Override
     public PictureVO getPictureVO(Picture picture, HttpServletRequest request) {
         // 对象转封装类
@@ -418,7 +439,7 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
     @Async   //异步执行
     @Override
     public void clearPictureFile(Picture oldPicture) {
-        // 判断改图片是否被多条记录使用(图片秒传的情况可能一个cos地址对应多个数据库url)
+        // 判断该图片是否被多条记录使用(图片秒传的情况可能一个cos地址对应多个数据库url)
         String pictureUrl = oldPicture.getUrl();
         long count = this.lambdaQuery()
                 .eq(Picture::getUrl, pictureUrl)
@@ -428,18 +449,18 @@ public class PictureServiceImpl extends ServiceImpl<PictureMapper, Picture>
             return;
         }
         // 删除图片
-        cosManager.deleteObject(pictureUrl);
+        cosManager.deleteIfNotBlank(pictureUrl);
+
         //删除原图
         String originalUrl=oldPicture.getOriginalUrl();
-        if (StrUtil.isNotBlank(originalUrl)) {
+        cosManager.deleteIfNotBlank(originalUrl);
-            cosManager.deleteObject(originalUrl);
+
-        }
         // 删除缩略图
         String thumbnailUrl = oldPicture.getThumbnailUrl();
-        if (StrUtil.isNotBlank(thumbnailUrl)) {
+        cosManager.deleteIfNotBlank(thumbnailUrl);
-            cosManager.deleteObject(thumbnailUrl);
+
-        }
     }
+
 }
 
 

src/main/resources/application.yml

@@ -2,6 +2,10 @@ server:
   port: 8123
   servlet:
     context-path: /api
+    # cookie 30 天过期
+    session:
+      cookie:
+        max-age: 2592000
 
 spring:
   profiles:
@@ -21,6 +25,11 @@ spring:
     port: 6379
     password: 123456
     timeout: 5000
+  # Session 配置
+  session:
+    store-type: redis
+    # session 30 天后过期，单位是秒
+    timeout: 2592000
   servlet:
     multipart:
       max-file-size: 10MB