java实现图片无损压缩,实测可行,不降低分辨率,压缩到原图像的1/7左右

package pers.wwz.three;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class PicUtils {

    /**
     * 对图片进行原比例无损压缩,压缩后覆盖原图片
     *
     * @param path
     */
    private static void doWithPhoto(String path) {
        File file = new File(path);
        if (!file.exists()) {
            return;
        }
        BufferedImage image = null;
        FileOutputStream os = null;
        try {
            image = ImageIO.read(file);
            int width = image.getWidth();
            int height = image.getHeight();
            BufferedImage bfImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            bfImage.getGraphics().drawImage(image.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
            os = new FileOutputStream(path);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
            encoder.encode(bfImage);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    public static void main(String[] args) {
        doWithPhoto("D:\\my_projects\\SadTalker\\examples\\source_image\\666.jpg");
    }
}

参考文档:java无损压缩图片_想养一只！的博客-CSDN博客