Graphics2D 图片上绘制文字，并设置文字边框 代码实例 // 读取原图片信息 //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); BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bufImg.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE); g2.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY); FontRenderContext frc = g2.getFontRenderContext(); TextLayout tl = new TextLayout("你好", new Font("黑体", Font.BOLD, 25), frc); //文字所在位置 Shape sha = tl.getOutline(AffineTransform.getTranslateInstance(690,390)); g2.setStroke(new BasicStroke(3.0f)); //边框颜色 g2.setColor(new Color(178, 113, 23)); g2.draw(sha); //字体颜色 g2.setColor(Color.WHITE); g2.fill(sha); g2.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();

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"));

Graphics2D 图片上添加图片或绘制二维码 代码实例 // 读取原图片信息 //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 g = bufImg.createGraphics(); g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null); //使用工具类生成二维码 Image image = createQrCode("二维码内容", 226, 226, "二维码中间logo图片地址"); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 g.drawImage(image, 263, 700, null); //或者将图片绘制上去 File file = new File("d:\\2.png"); BufferedImage read = ImageIO.read(file); Graphics2D k = bufImg.createGraphics(); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 k.drawImage(read, 650, 188, 150,150,null); k.setColor(Color.WHITE); k.dispose(); //设置颜色。 g.setColor(Color.WHITE); g.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(); private static BufferedImage createQrCode(String content, int width, int height, String logoPath) throws IOException { QrConfig config = new QrConfig(width, height); if (logoPath != null) { Image image = ImageIO.read(new FileInputStream(new File(logoPath))); config.setImg(image); } config.setErrorCorrection(ErrorCorrectionLevel.H); return QrCodeUtil.generate( content, config); }二维码生成工具引用 <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.2.4</version> </dependency>