<dependency>
    <groupId>org.sejda.imageio</groupId>
    <artifactId>webp-imageio</artifactId>
    <version>0.1.6</version>
</dependency>

 
import com.luciad.imageio.webp.WebPImageReaderSpi;
import com.luciad.imageio.webp.WebPImageWriterSpi;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.spi.IIORegistry;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
 
/**
 * <p>
 * webg圖片轉(zhuǎn)換為jpg
 * </p>
 *
 * @author 沙龍果
 * @Filename JpegWebgClass
 * @since 2024/1/4
 */
public class JpegWebgClass {
    public static void main(String[] args) {
        // 注冊(cè)WebP ImageIO插件
        IIORegistry registry = IIORegistry.getDefaultInstance();
        registry.registerServiceProvider(new WebPImageReaderSpi());
        registry.registerServiceProvider(new WebPImageWriterSpi());
        List<String> webpList = new ArrayList<>();
        webpList.add("C:\\Users\\Administrator\\Desktop\\changku\\src\\main\\resources\\upload\\2.webp");
        webpList.add("C:\\Users\\Administrator\\Desktop\\changku\\src\\main\\resources\\upload\\3.webp");
        webpList.add("C:\\Users\\Administrator\\Desktop\\changku\\src\\main\\resources\\upload\\4.webp");
        int i = 1;
        for (String webp : webpList) {
            try {
                // 讀取WebP格式圖片
                File input = new File(webp);
                ImageInputStream inputStream = ImageIO.createImageInputStream(input);
                ImageReader reader = ImageIO.getImageReadersByMIMEType("image/webp").next();
                reader.setInput(inputStream);
                BufferedImage image = reader.read(0);
 
                // 將圖片轉(zhuǎn)換為JPG格式
                String m = "C:\\Users\\Administrator\\Desktop\\changku\\src\\main\\resources\\jpeg\\";
                String jpeg = "webp" + (i++) + ".jpeg";
                File output = new File(m + jpeg);
                ImageOutputStream outputStream = ImageIO.createImageOutputStream(output);
                ImageWriter writer = ImageIO.getImageWritersByFormatName("jpeg").next();
                writer.setOutput(outputStream);
                writer.write(image);
 
                // 關(guān)閉IO流
                inputStream.close();
                outputStream.close();
                reader.dispose();
                writer.dispose();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

>>>> from PIL import Image
>>>> im = Image.open("text.webp").convert("RGB")
>>>> im.save("test.jpg", "jpeg")

>>> brew install imagemagick
>>> magick input.webp output.jpg