图片调整

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

@@ -12,32 +12,39 @@ import java.net.URL;
 import com.drew.imaging.ImageMetadataReader;
 import com.drew.metadata.Metadata;
 import com.drew.metadata.exif.ExifIFD0Directory;
+import net.coobird.thumbnailator.resizers.configurations.ScalingMode;
+
 public class ImageUtil {
     public static PictureRenderData createWithThumbnailator(String imageUrl, int width, int height) {
         try {
-            // 下载原图
             URL url = new URL(imageUrl);
             BufferedImage originalImage = ImageIO.read(url);
 
-            // 1. 读取EXIF判断是否需要旋转
             int rotationAngle = getRotationAngleFromExif(url);
 
-            // 2. 根据判断结果决定是否旋转
+            // 使用Thumbnailator的增强配置
-            BufferedImage processedImage;
+            Thumbnails.Builder<BufferedImage> builder = Thumbnails.of(originalImage)
-            if (rotationAngle != 0) {
-                // 需要旋转
-                processedImage = Thumbnails.of(originalImage)
                     .size(width, height)
-                        .rotate(rotationAngle)
+                    .outputQuality(1.0)           // 最高质量
-                        .asBufferedImage();
+                    .imageType(BufferedImage.TYPE_INT_RGB) // 确保RGB类型
+                    .useOriginalFormat()           // 保持原始格式
+                    .allowOverwrite(true);         // 允许覆盖
+
+            // 设置缩放算法
+            if (width * height > 100000) { // 大图使用双三次插值
+                builder.scalingMode(ScalingMode.BICUBIC);
             } else {
-                // 不需要旋转，只缩放
+                builder.scalingMode(ScalingMode.BILINEAR);
-                processedImage = Thumbnails.of(originalImage)
-                        .size(width, height)
-                        .asBufferedImage();
             }
 
-            // 3. 转换为byte数组
+            BufferedImage processedImage;
+            if (rotationAngle != 0) {
+                processedImage = builder.rotate(rotationAngle).asBufferedImage();
+            } else {
+                processedImage = builder.asBufferedImage();
+            }
+
+            // 使用ImageIO写入（设置更高的质量参数）
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             ImageIO.write(processedImage, "jpg", baos);
 
@@ -46,6 +53,7 @@ public class ImageUtil {
                     .create();
 
         } catch (Exception e) {
+            e.printStackTrace();
             return Pictures.ofUrl(imageUrl, PictureType.JPEG)
                     .size(width, height)
                     .create();