Graphics2D 在一张图片上添加一个带有透明背景的图片或绘制透明图片 代码实例 // 读取原图片信息 底图 //得到文件 File file = new File("d:\\1.png"); //文件转化为图片 Image srcImg = ImageIO.read(file); //获取图片的宽 int srcImgWidth = srcImg.getWidth(null); //获取图片的高 int srcImgHeight = srcImg.getHeight(null); // 加水印 BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D gs = bufImg.createGraphics(); //得到带有透明背景的图片 Image ima=ImageIO.read(new File("d:\\2.png")); BufferedImage bi=new BufferedImage(ima.getWidth(null),ima.getHeight(null),BufferedImage.TYPE_INT_BGR); Graphics2D gg=bi.createGraphics(); bi= gg.getDeviceConfiguration().createCompatibleImage(ima.getWidth(null), ima.getHeight(null), Transparency.TRANSLUCENT); gg = bi.createGraphics(); gg.drawImage(ima, 0, 0, null); gg.dispose(); //将透明背景图绘制到底图上 // 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y) gs.drawImage(bi, 605, 148,null); gs.dispose(); ByteArrayOutputStream bs = new ByteArrayOutputStream(); ImageOutputStream imOut = ImageIO.createImageOutputStream(bs); ImageIO.write(bufImg, "png", imOut); InputStream inputStream = new ByteArrayInputStream(bs.toByteArray()); OutputStream outStream = new FileOutputStream("d:\\3.png"); IOUtils.copy(inputStream, outStream); inputStream.close(); outStream.close();绘制透明图片 int width=256; int height=256; //创建BufferedImage对象 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取Graphics2D Graphics2D g2d = image.createGraphics(); // 增加下面代码使得背景透明 image = g2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT); g2d.dispose(); g2d = image.createGraphics(); // 释放对象 g2d.dispose(); // 保存文件 ImageIO.write(image, "png", new File("D:/test.png"));