优化

file/src/main/java/com/baiyue/file/controller/PlatformMeasurementImageController.java

@@ -81,6 +81,24 @@ public class PlatformMeasurementImageController {
             .body(image.content());
     }
 
+    @GetMapping("/{tenantId}/{inboundId}/{fileId}/thumbnail")
+    @PreAuthorize("hasAuthority('platform:firstleg:inbound:measure:view')")
+    @Operation(summary = "查看入库单称重图片缩略图")
+    public ResponseEntity<byte[]> thumbnail(
+        @AuthenticationPrincipal AuthenticatedUser user,
+        @PathVariable long tenantId,
+        @PathVariable long inboundId,
+        @PathVariable long fileId) {
+        requirePlatform(user);
+        requirePositive(tenantId, inboundId, fileId);
+        var image = images.thumbnail(tenantId, inboundId, fileId);
+        return ResponseEntity.ok()
+            .cacheControl(CacheControl.noStore())
+            .contentType(MediaType.IMAGE_JPEG)
+            .contentLength(image.content().length)
+            .body(image.content());
+    }
+
     private long requirePlatform(AuthenticatedUser user) {
         if (user == null || !"PLATFORM".equalsIgnoreCase(user.appCode())
             || user.tenantId() == null || user.tenantId() != 0L

file/src/main/java/com/baiyue/file/service/MeasurementImageService.java

@@ -15,11 +15,19 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.time.LocalDateTime;
+import java.util.Set;
+
+import javax.imageio.ImageIO;
 
 @Service
 public class MeasurementImageService {
@@ -81,11 +89,45 @@ public class MeasurementImageService {
         return new Download(object.getOriginalName(), object.getContentType(), storage.read(object.getObjectKey()));
     }
 
+    public Download thumbnail(long tenantId, long inboundId, long fileId) {
+        Download original = download(tenantId, inboundId, fileId);
+        try {
+            BufferedImage source = ImageIO.read(new ByteArrayInputStream(original.content()));
+            if (source == null) {
+                throw new BizException(ResultCode.VALIDATION_FAILED, "称重图片无法生成缩略图");
+            }
+            double scale = Math.min(1D, Math.min(480D / source.getWidth(), 320D / source.getHeight()));
+            int width = Math.max(1, (int) Math.round(source.getWidth() * scale));
+            int height = Math.max(1, (int) Math.round(source.getHeight() * scale));
+            BufferedImage target = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+            Graphics2D graphics = target.createGraphics();
+            try {
+                graphics.setColor(Color.WHITE);
+                graphics.fillRect(0, 0, width, height);
+                graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+                graphics.setRenderingHint(RenderingHints.KEY_RENDERING,
+                    RenderingHints.VALUE_RENDER_QUALITY);
+                graphics.drawImage(source, 0, 0, width, height, null);
+            } finally {
+                graphics.dispose();
+            }
+            ByteArrayOutputStream output = new ByteArrayOutputStream();
+            if (!ImageIO.write(target, "jpg", output)) {
+                throw new BizException(ResultCode.INTERNAL_ERROR, "称重图片缩略图编码失败");
+            }
+            return new Download("thumbnail.jpg", "image/jpeg", output.toByteArray());
+        } catch (IOException exception) {
+            throw new BizException(ResultCode.INTERNAL_ERROR, "称重图片缩略图生成失败");
+        }
+    }
+
     @Transactional
     public void deleteMeasurementEvidence(long tenantId, long inboundId, long fileId, long operatorId) {
         FileObjectEntity object = requireObject(tenantId, inboundId, fileId);
-        if (!"INBOUND_MEASUREMENT_IMAGE".equals(object.getBusinessType())) {
-            throw new BizException(ResultCode.CONFLICT, "仅允许清理第三方尺寸测量证据图片");
+        if (!Set.of("INBOUND_WEIGHT_IMAGE", "INBOUND_MEASUREMENT_IMAGE")
+            .contains(object.getBusinessType())) {
+            throw new BizException(ResultCode.CONFLICT, "仅允许清理入库测量图片");
         }
         object.setStatus("DELETED");
         object.setUpdatedBy(operatorId);