JAVA实现图片叠加效果

悠悠 2021-06-24 15:57 477阅读 0赞

[http://www.cnblogs.com/bilaisheng/p/5500223.html][http_www.cnblogs.com_bilaisheng_p_5500223.html]

import java.awt.AlphaComposite;
    import java.awt.Graphics2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    
    import javax.imageio.ImageIO;
    public class NewImageUtils {
        /**
         * 
         * @Title: 构造图片
         * @Description: 生成水印并返回java.awt.image.BufferedImage
         * @param file
         *            源文件(图片)
         * @param waterFile
         *            水印文件(图片)
         * @param x
         *            距离右下角的X偏移量
         * @param y
         *            距离右下角的Y偏移量
         * @param alpha
         *            透明度, 选择值从0.0~1.0: 完全透明~完全不透明
         * @return BufferedImage
         * @throws IOException
         */
        public static BufferedImage watermark(File file, File waterFile, int x, int y, float alpha) throws IOException {
            // 获取底图
            BufferedImage buffImg = ImageIO.read(file);
            // 获取层图
            BufferedImage waterImg = ImageIO.read(waterFile);
            // 创建Graphics2D对象，用在底图对象上绘图
            Graphics2D g2d = buffImg.createGraphics();
            int waterImgWidth = waterImg.getWidth();// 获取层图的宽度
            int waterImgHeight = waterImg.getHeight();// 获取层图的高度
            // 在图形和图像中实现混合和透明效果
            g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
            // 绘制
            g2d.drawImage(waterImg, x, y, waterImgWidth, waterImgHeight, null);
            g2d.dispose();// 释放图形上下文使用的系统资源
            return buffImg;
        }
    
        /**
         * 输出水印图片
         * 
         * @param buffImg
         *            图像加水印之后的BufferedImage对象
         * @param savePath
         *            图像加水印之后的保存路径
         */
        private void generateWaterFile(BufferedImage buffImg, String savePath) {
            int temp = savePath.lastIndexOf(".") + 1;
            try {
                ImageIO.write(buffImg, savePath.substring(temp), new File(savePath));
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
    
        /**
         * 
         * @param args
         * @throws IOException
         *             IO异常直接抛出了
         * @author bls
         */
        public static void main(String[] args) throws IOException {
            String sourceFilePath = "D://img//di.png";
            String waterFilePath = "D://img//ceng.png";
            String saveFilePath = "D://img//new.png";
            NewImageUtils newImageUtils = new NewImageUtils();
            // 构建叠加层
            BufferedImage buffImg = NewImageUtils.watermark(new File(sourceFilePath), new File(waterFilePath), 0, 0, 1.0f);
            // 输出水印图片
            newImageUtils.generateWaterFile(buffImg, saveFilePath);
        }
    }

[http_www.cnblogs.com_bilaisheng_p_5500223.html]: http://www.cnblogs.com/bilaisheng/p/5500223.html