Merge remote-tracking branch 'origin/dev' into dev

xueyi-modules/xueyi-file/src/main/java/com/xueyi/file/utils/PdfToImageUtil.java

@@ -8,6 +8,8 @@ import org.slf4j.LoggerFactory;
 import org.springframework.web.multipart.MultipartFile;
 
 import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
 import javax.servlet.http.HttpServletResponse;
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
@@ -18,6 +20,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
@@ -70,8 +73,11 @@ public class PdfToImageUtil {
                 BufferedImage image = pdfRenderer.renderImageWithDPI(pageIdx, 300); // Set the DPI as needed
 
                 // 保存图像到本地临时目录
-                String imageName = "page_" + (pageIdx + 1) + ".png";
-                File imageFile = saveImageToFile(image, imageName);
+                /*String imageName = "page_" + (pageIdx + 1) + ".png";
+                File imageFile = saveImageToFile(image, imageName);*/
+                String imageName = "page_" + (pageIdx + 1) + ".jpg";
+                File imageFile = saveCompressedImage(image, imageName, 0.8f);
+
                 imageFiles.add(imageFile);
             }
         }
@@ -131,6 +137,26 @@ public class PdfToImageUtil {
     }
 
 
+    private static File saveCompressedImage(BufferedImage image, String imageName, float compressionQuality) throws IOException {
+        File tempDir = new File(TEMP_DIR);
+        if (!tempDir.exists()) {
+            tempDir.mkdirs();
+        }
+
+        File imageFile = new File(tempDir, imageName);
+
+        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
+        ImageWriter writer = writers.next();
+
+        ImageWriteParam param = writer.getDefaultWriteParam();
+        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        param.setCompressionQuality(compressionQuality);
+
+        ImageIO.write(image, "jpg", imageFile);
+
+        return imageFile;
+    }
+
 
 
     /**