修改模糊图

web-domain/src/main/java/com/zcloud/edu/domain/utils/FixedPictureUtils.java

@@ -2,6 +2,9 @@ package com.zcloud.edu.domain.utils;
 
 import com.deepoove.poi.data.PictureRenderData;
 import com.deepoove.poi.data.Pictures;
+import com.drew.imaging.ImageMetadataReader;
+import com.drew.metadata.Metadata;
+import com.drew.metadata.exif.ExifIFD0Directory;
 
 import javax.imageio.ImageIO;
 import javax.imageio.ImageReader;
@@ -27,12 +30,19 @@ public class FixedPictureUtils {
      * @return 正常显示的PictureRenderData
      * @throws IOException IO异常
      */
-    public static PictureRenderData ofNormalUrl(String imgUrl, int width, int height) throws IOException {
-        byte[] imgBytes = readBytesFromUrl(imgUrl);
-        byte[] fixedImgBytes = fixImageRotation(imgBytes);
-        return Pictures.ofBytes(fixedImgBytes)
-                .size(width, height)
-                .create();
+    public static PictureRenderData ofNormalUrl(String imgUrl, int width, int height)  {
+        try{
+            byte[] imgBytes = readBytesFromUrl(imgUrl);
+            byte[] fixedImgBytes = fixImageRotation(imgBytes);
+            return Pictures.ofBytes(fixedImgBytes)
+                    .size(width, height)
+                    .create();
+        }catch (Exception e){
+            return Pictures.ofUrl(imgUrl)
+                    .size(width, height)
+                    .create();
+        }
+
     }
 
     /**
@@ -54,29 +64,65 @@ public class FixedPictureUtils {
     /**
      * 核心：修复图片旋转（JDK 8兼容）
      */
-    private static byte[] fixImageRotation(byte[] imageBytes) throws IOException {
-        // 1. 解析EXIF旋转角度
-        int rotation = getExifRotation(imageBytes);
+    private static byte[] fixImageRotation(byte[] imageBytes) throws Exception {
+        try (ByteArrayInputStream bais = new ByteArrayInputStream(imageBytes)) {
+            // 1. 读取 EXIF 元数据
+            Metadata metadata = ImageMetadataReader.readMetadata(bais);
 
-        // 2. 兜底检测：无EXIF时自动判断
-        if (rotation == 0) {
-            rotation = detectImageOrientation(imageBytes);
+            // 2. 获取旋转角度
+            int rotation = getRotationFromMetadata(metadata);
+
+            // 3. 如果不需要旋转，直接返回原字节
+            if (rotation == 0) {
+                return imageBytes;
+            }
+
+            // 4. 读取并旋转图片
+            bais.reset(); // 重置流到开始位置
+            BufferedImage original = ImageIO.read(bais);
+            BufferedImage rotated = rotateImage(original, rotation);
+
+            // 5. 转为字节数组返回
+            try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+                String format = getImageFormat(imageBytes);
+                ImageIO.write(rotated, format, baos);
+                return baos.toByteArray();
+            }
         }
+    }
+    /**
+     * 从EXIF读取需要旋转的角度
+     * 返回：0-不需要旋转，90/180/270-需要旋转的角度
+     */
+    /**
+     * 从 Metadata 获取旋转角度
+     * @param metadata EXIF 元数据
+     * @return 需要旋转的角度（0/90/180/270）
+     */
+    private static int getRotationFromMetadata(Metadata metadata) {
+        try {
+            ExifIFD0Directory exifIFD0Directory = metadata.getFirstDirectoryOfType(ExifIFD0Directory.class);
 
-        // 3. 无需旋转则返回原字节
-        if (rotation == 0) {
-            return imageBytes;
-        }
+            if (exifIFD0Directory == null || !exifIFD0Directory.containsTag(ExifIFD0Directory.TAG_ORIENTATION)) {
+                return 0; // 没有 EXIF 或 Orientation 标签，不需要旋转
+            }
 
-        // 4. 读取并旋转图片
-        BufferedImage original = readImage(imageBytes);
-        BufferedImage rotated = rotateImage(original, rotation);
+            int orientation = exifIFD0Directory.getInt(ExifIFD0Directory.TAG_ORIENTATION);
 
-        // 5. 转为字节返回
-        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
-            String format = getImageFormat(imageBytes);
-            ImageIO.write(rotated, format, baos);
-            return baos.toByteArray();
+            // 根据 Orientation 值返回对应的旋转角度
+            switch (orientation) {
+                case 3: // 旋转 180 度
+                    return 180;
+                case 6: // 顺时针旋转 90 度
+                    return 90;
+                case 8: // 逆时针旋转 90 度（270 度）
+                    return 270;
+                default: // 1 或其他，不需要旋转
+                    return 0;
+            }
+        } catch (Exception e) {
+            // 任何异常都返回 0 度
+            return 0;
         }
     }