图片叠加效果Java代码实现

 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-600"; String waterFilePath = "D://img//ceng.png-600"; String saveFilePath = "D://img//new.png-600"; 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); } }