下载图片+水印(作者ID+作者名)

src/main/java/com/bao/dating/config/AliyunOSSConfig.java

@@ -0,0 +1,16 @@
+package com.bao.dating.config;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Data
+@Component
+@ConfigurationProperties(prefix = "aliyun.oss")
+public class AliyunOSSConfig {
+    private String endpoint;
+    private String accessKeyId;
+    private String accessKeySecret;
+    private String bucketName;
+
+}

src/main/java/com/bao/dating/config/WebConfig.java

@@ -30,7 +30,8 @@ public class WebConfig implements WebMvcConfigurer {
                 // 忽略的接口
                 .excludePathPatterns(
                         "/user/login",
-                        "/user/sendCode"
+                        "/user/sendCode",
+                        "/download/{postId}"
                 );
     }
 }

src/main/java/com/bao/dating/controller/PostController.java

@@ -12,6 +12,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.imageio.ImageIO;
+import javax.servlet.http.HttpServletResponse;
+import java.awt.image.BufferedImage;
 import java.util.List;
 
 /**
@@ -87,4 +90,20 @@ public class PostController {
         PostEditVO result = postService.updatePost(postId, postRequestDTO);
         return Result.success(ResultCode.SUCCESS, "动态更新成功", result);
     }
+
+    @GetMapping("/download/{postId}")
+    public void downloadPostImage(@PathVariable Long postId, HttpServletResponse response) throws Exception {
+        try {
+            //Service 返回已经加好水印的图片
+            BufferedImage image = postService.downloadWithWatermark(postId);
+            //设置响应头，触发浏览器下载
+            response.setContentType("image/jpeg");
+            response.setHeader("Content-Disposition", "attachment;filename=post_" + postId + ".jpg");
+            //输出到浏览器
+            ImageIO.write(image, "jpg", response.getOutputStream());
+            response.getOutputStream().flush();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
 }

src/main/java/com/bao/dating/controller/UserController.java

@@ -6,6 +6,7 @@ import com.bao.dating.common.ResultCode;
 import com.bao.dating.context.UserContext;
 import com.bao.dating.pojo.dto.UserInfoUpdateDTO;
 import com.bao.dating.pojo.dto.UserLoginDTO;
+import com.bao.dating.pojo.entity.User;
 import com.bao.dating.pojo.vo.UserInfoVO;
 import com.bao.dating.pojo.vo.UserLoginVO;
 import com.bao.dating.service.UserService;

src/main/java/com/bao/dating/mapper/PostMapper.java

@@ -5,6 +5,7 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 
 import java.util.List;
+import java.util.Map;
 
 /**
  * 动态Mapper
@@ -95,4 +96,12 @@ public interface PostMapper {
      * @return 影响行数
      */
     int decreaseFavoriteCount(Long postId);
+
+    /**
+     * 根据动态id查询用户名和媒体信息
+     *
+     * @param postId 动态id
+     * @return 用户名和媒体信息
+     */
+    Map<String, Object> getUsernameByUserId(Long postId);
 }

src/main/java/com/bao/dating/pojo/entity/User.java

@@ -44,7 +44,7 @@ public class User implements Serializable {
 
     private String userPhone;
 
-    private Double latitude;
+    private Double latitude;   // 纬度
 
-    private Double longitude;
+    private Double longitude;  // 经度
 }

src/main/java/com/bao/dating/service/PostService.java

@@ -5,6 +5,7 @@ import com.bao.dating.pojo.entity.Post;
 import com.bao.dating.pojo.vo.PostEditVO;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.awt.image.BufferedImage;
 import java.util.List;
 
 /**
@@ -55,4 +56,11 @@ public interface PostService {
      * @return 用户id
      */
     Long selectUserIdByPostId(Long postId);
+
+    /**
+     * 下载动态图片并添加水印
+     * @param postId 动态ID
+     * @return 带水印的图片
+     */
+    BufferedImage downloadWithWatermark(Long postId) throws Exception;
 }

src/main/java/com/bao/dating/service/impl/PostServiceImpl.java

@@ -10,11 +10,13 @@ import com.bao.dating.mapper.PostLikeMapper;
 import com.bao.dating.mapper.PostMapper;
 import com.bao.dating.pojo.dto.PostRequestDTO;
 import com.bao.dating.pojo.entity.Post;
+import com.bao.dating.pojo.entity.User;
 import com.bao.dating.pojo.vo.PostEditVO;
 import com.bao.dating.service.PostService;
 import com.bao.dating.common.aliyun.AliOssUtil;
 import com.bao.dating.service.UserService;
 import com.bao.dating.util.FileUtil;
+import com.bao.dating.util.WatermarkUtil;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -22,6 +24,7 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.awt.image.BufferedImage;
 import java.io.IOException;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
@@ -57,6 +60,9 @@ public class PostServiceImpl implements PostService {
     @Autowired
     private CommentsMapper commentsMapper;
 
+    @Autowired
+    private WatermarkUtil watermarkUtil;
+
     /**
      * 上传媒体文件
      * @param files 媒体文件数组
@@ -331,4 +337,61 @@ public class PostServiceImpl implements PostService {
         return postMapper.selectUserIdByPostId(postId);
     }
 
+    /**
+     * 下载动态图片并添加水印
+     *
+     * @param postId 动态ID
+     * @return 带水印的图片
+     * @throws Exception
+     */
+    @Override
+    public BufferedImage downloadWithWatermark(Long postId) throws Exception {
+        // 一次性查出 动态图片 + 作者信息
+        Map<String, Object> map = postMapper.getUsernameByUserId(postId);
+
+        if (map == null || map.isEmpty()) {
+            Post post = postMapper.selectById(postId);
+            if (post == null) {
+                throw new RuntimeException("未找到指定postId的帖子: " + postId);
+            }
+            throw new RuntimeException("未找到与postId相关的用户和媒体信息: " + postId);
+        }
+
+        String mediaUrl = (String) map.get("media_oss_keys");
+        String username = (String) map.get("user_name");
+        Object userIdObj = map.get("user_id");
+
+        if (mediaUrl == null || username == null || userIdObj == null) {
+            throw new RuntimeException("用户或媒体信息不完整: " + map);
+        }
+
+        mediaUrl = mediaUrl.trim();
+        if (mediaUrl.isEmpty()) {
+            throw new RuntimeException("媒体URL为空，postId: " + postId);
+        }
+
+        Long userId = userIdObj instanceof Number
+                ? ((Number) userIdObj).longValue()
+                : Long.valueOf(userIdObj.toString());
+
+        // 解析 OSS ObjectKey（支持完整URL和直接存key两种）
+        String cleanUrl = mediaUrl.split("\\?")[0]; // 去掉 ? 后面的参数
+        String objectKey;
+
+        if (cleanUrl.startsWith("http")) {
+            // https://xxx.oss-cn-xxx.aliyuncs.com/post/xxx.jpg → post/xxx.jpg
+            objectKey = cleanUrl.substring(cleanUrl.indexOf(".com/") + 5);
+        } else {
+            objectKey = cleanUrl;
+        }
+
+        if (objectKey.trim().isEmpty()) {
+            throw new RuntimeException("解析后的ObjectKey为空，url: " + mediaUrl);
+        }
+
+        // 下载并动态加水印（只给下载的人看，OSS原图不改，数据库不动）
+        return watermarkUtil.downloadAndWatermark(objectKey, username, userId);
+    }
+
+
 }

src/main/java/com/bao/dating/util/WatermarkUtil.java

@@ -0,0 +1,64 @@
+    package com.bao.dating.util;
+
+    import com.aliyun.oss.OSS;
+    import com.aliyun.oss.OSSClientBuilder;
+    import com.bao.dating.config.AliyunOSSConfig;
+    import com.bao.dating.mapper.PostMapper;
+    import org.springframework.beans.factory.annotation.Autowired;
+    import org.springframework.stereotype.Component;
+
+    import javax.imageio.ImageIO;
+    import java.awt.*;
+    import java.awt.image.BufferedImage;
+    import java.io.InputStream;
+
+    @Component
+    public class WatermarkUtil {
+
+        @Autowired
+        private AliyunOSSConfig aliyunOSSConfig;
+
+
+        public BufferedImage downloadAndWatermark(String objectKey, String username, Long userId) throws Exception {
+            OSS ossClient = new OSSClientBuilder().build(
+                    aliyunOSSConfig.getEndpoint(),
+                    aliyunOSSConfig.getAccessKeyId(),
+                    aliyunOSSConfig.getAccessKeySecret()
+            );
+
+            InputStream inputStream = ossClient.getObject(aliyunOSSConfig.getBucketName(), objectKey).getObjectContent();
+            BufferedImage image = ImageIO.read(inputStream);
+            Graphics2D g2d = image.createGraphics();
+
+            g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
+
+            // 字体小一点
+            Font font = new Font("微软雅黑", Font.BOLD, 24);
+            g2d.setFont(font);
+
+            String text = "作者：" + username + " (ID:" + userId + ")";
+
+            FontMetrics fm = g2d.getFontMetrics();
+            int textWidth = fm.stringWidth(text);
+            int textHeight = fm.getHeight();
+
+            // 右下角留边距
+            int x = image.getWidth() - textWidth - 20;
+            int y = image.getHeight() - 20;
+
+            // 黑色描边
+            g2d.setColor(Color.BLACK);
+            g2d.drawString(text, x - 1, y - 1);
+            g2d.drawString(text, x + 1, y - 1);
+            g2d.drawString(text, x - 1, y + 1);
+            g2d.drawString(text, x + 1, y + 1);
+
+            // 白色正文
+            g2d.setColor(Color.WHITE);
+            g2d.drawString(text, x, y);
+
+            g2d.dispose();
+            ossClient.shutdown();
+            return image;
+        }
+    }

src/main/resources/com/bao/dating/mapper/PostMapper.xml

@@ -122,5 +122,11 @@
     <select id="selectFavoriteCount" resultType="java.lang.Integer">
         select dating.post.favorite_count from dating.post where post.post_id = #{postId}
     </select>
+    <select id="getUsernameByUserId" resultType="map">
+        SELECT u.user_name, u.user_id, p.media_oss_keys
+        FROM post p 
+        LEFT JOIN user u ON p.user_id = u.user_id 
+        WHERE p.post_id = #{postId}
+    </select>
 
 </mapper>

src/main/resources/com/bao/dating/mapper/UserMapper.xml

@@ -5,22 +5,6 @@
 <mapper namespace="com.bao.dating.mapper.UserMapper">
 
     <!--根据用户名查询用户-->
-    <resultMap id="UserInfoVOResultMap" type="com.bao.dating.pojo.vo.UserInfoVO">
-        <id property="userId" column="user_id"/>
-        <result property="userName" column="user_name"/>
-        <result property="nickname" column="nickname"/>
-        <result property="avatarUrl" column="avatar_url"/>
-        <result property="backgroundUrl" column="background_url"/>
-        <result property="gender" column="gender"/>
-        <result property="birthday" column="birthday"/>
-        <result property="hobbies" column="hobbies" typeHandler="com.bao.dating.handler.ListToJsonTypeHandler"/>
-        <result property="signature" column="signature"/>
-        <result property="createdAt" column="created_at"/>
-        <result property="updatedAt" column="updated_at"/>
-        <result property="latitude" column="user_latitude"/>
-        <result property="longitude" column="user_longitude"/>
-    </resultMap>
-    
     <select id="getByUsername" resultType="com.bao.dating.pojo.entity.User">
         SELECT
             user_id,
@@ -44,6 +28,8 @@
         <result property="signature" column="signature"/>
         <result property="createdAt" column="created_at"/>
         <result property="updatedAt" column="updated_at"/>
+        <result property="latitude" column="user_latitude"/>
+        <result property="longitude" column="user_longitude"/>
     </resultMap>
     <select id="selectByUserId" resultMap="UserResultMap">
         SELECT
@@ -60,7 +46,7 @@
             updated_at,
             user_latitude,
             user_longitude
-            FROM dating.user WHERE user_id = #{userId}
+        FROM dating.user WHERE user_id = #{userId}
     </select>
 
     <!--根据ID更新动态-->
@@ -96,6 +82,22 @@
     <select id="selectByPhone" resultType="com.bao.dating.pojo.entity.User">
         select * from dating.user where user_phone =#{phone}
     </select>
+    <resultMap id="UserInfoVOResultMap" type="com.bao.dating.pojo.vo.UserInfoVO">
+        <id property="userId" column="user_id"/>
+        <result property="userName" column="user_name"/>
+        <result property="nickname" column="nickname"/>
+        <result property="avatarUrl" column="avatar_url"/>
+        <result property="backgroundUrl" column="background_url"/>
+        <result property="gender" column="gender"/>
+        <result property="birthday" column="birthday"/>
+        <result property="hobbies" column="hobbies" typeHandler="com.bao.dating.handler.ListToJsonTypeHandler"/>
+        <result property="signature" column="signature"/>
+        <result property="createdAt" column="created_at"/>
+        <result property="updatedAt" column="updated_at"/>
+        <result property="latitude" column="user_latitude"/>
+        <result property="longitude" column="user_longitude"/>
+    </resultMap>
+    
     <select id="findByLatLngRange" resultMap="UserInfoVOResultMap">
         SELECT 
             user_id,
@@ -113,4 +115,6 @@
             user_longitude
         FROM user WHERE user_latitude BETWEEN #{minLat} AND #{maxLat} AND user_longitude BETWEEN #{minLng} AND #{maxLng}
     </select>
+
+
 </mapper>