图片压缩

src/main/java/com/sqx/modules/file/utils/FileUploadUtils.java

@@ -16,9 +16,14 @@ import java.net.URL;
 import java.nio.file.Files;
 import java.util.Base64;
 
+import javax.imageio.IIOImage;
 import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+import javax.imageio.stream.FileImageOutputStream;
 import javax.xml.bind.DatatypeConverter;
 import java.util.Date;
+import java.util.Iterator;
 
 /**
  * 文件上传工具类
@@ -144,26 +149,38 @@ public class FileUploadUtils
 //        } catch (Exception e) {
 //            System.out.println("压缩失败：" + e.getMessage());
 //        }
+        try {
+            File inputFile = new File(pathFileName); // 输入图片文件
+            File outputFile = new File(pathFileName); // 输出图片文件
+            float quality = 0.5f; // 压缩质量，范围0.0到1.0
+            compressImage(inputFile, outputFile, quality);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
         return pathFileName;
     }
-    public static byte[] compressImage(File imageFile, float scale) throws IOException {
-        BufferedImage originalImage = ImageIO.read(imageFile);
-        // 保存缩放后的图片到输出流
-        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        Image compressedImage = originalImage.getScaledInstance(
-                (int)(originalImage.getWidth() * scale),
-                (int)(originalImage.getHeight() * scale),
-                Image.SCALE_SMOOTH);
 
-        BufferedImage outputImage = new BufferedImage(
-                compressedImage.getWidth(null),
-                compressedImage.getHeight(null),
-                BufferedImage.TYPE_INT_RGB);
 
-        outputImage.createGraphics().drawImage(compressedImage, 0, 0, null);
-        ImageIO.write(outputImage, "png", outputStream); // 或者 "png" 如果是PNG图片
+    public static void compressImage(File inputFile, File outputFile, float quality) throws IOException {
+        // 读取图片
+        BufferedImage image = ImageIO.read(inputFile);
 
-        return outputStream.toByteArray();
+        // 获取图片写入工具
+        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpeg");
+        ImageWriter writer = writers.next();
+
+        // 设置写入参数
+        ImageWriteParam param = writer.getDefaultWriteParam();
+        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        param.setCompressionQuality(quality); // 设置压缩质量
+
+        // 将BufferedImage写入文件
+        FileImageOutputStream output = new FileImageOutputStream(outputFile);
+        writer.setOutput(output);
+        writer.write(null, new IIOImage(image, null, null), param);
+
+        output.close();
+        writer.dispose();
     }
     /**
      * 编码文件名