Java给图片加水印

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

public class WatermarkExample {
    public static void main(String[] args) {
        try {
            // 读取原始图像
            File sourceImageFile = new File("IMG_2024.jpg");
            BufferedImage sourceImage = ImageIO.read(sourceImageFile);

            // 读取水印图像
            File watermarkImageFile = new File("Icon24.png");
            BufferedImage watermarkImage = ImageIO.read(watermarkImageFile);

            // 创建Graphics2D对象
            Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();

            // 设置透明度（alpha值）
            AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f); // 0.5f表示50%的透明度
            g2d.setComposite(alphaChannel);

            // 计算水印图像放置的位置（这里简单设置为右下角）
            int x = sourceImage.getWidth() - watermarkImage.getWidth() - 10; // 10是边距
            int y = sourceImage.getHeight() - watermarkImage.getHeight() - 10;

            // 绘制水印图像
            g2d.drawImage(watermarkImage, x, y, null);

            // 释放Graphics2D对象
            g2d.dispose();

            // 保存处理后的图像
            File outputImageFile = new File("image_with_watermark.jpg");
            ImageIO.write(sourceImage, "jpg", outputImageFile);

            System.out.println("水印添加成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}