java生成二维码有很多开发的jar包如zxing是谷歌开发的，这里的话我使用zxing的开发包来实现的。我们在很多项目中需要动态生成二维码，来提供给用户，这样让更多人能够很好的通过二维码来体验自己的应用。
下面贴出代码，已经测试通过，大家可以直接复制代码使用：
最后实现结果：
java生成二维码
代码如下：
import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; public class MatrixToImageWriter { private static final int IMAGE_WIDTH = 100; private static final int IMAGE_HEIGHT = 100; private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2; private static final int FRAME_WIDTH = 2; private static MultiFormatWriter mutiWriter = new MultiFormatWriter(); public static void encode(String content, int width, int height, String srcImagePath, String destImagePath) { try { ImageIO.write(genBarcode(content, width, height, srcImagePath), "jpg", new File(destImagePath)); } catch (IOException e) { e.printStackTrace(); } catch (WriterException e) { e.printStackTrace(); } } private static BufferedImage genBarcode(String content, int width, int height, String srcImagePath) throws WriterException, IOException { BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH, IMAGE_HEIGHT, true); int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT]; for (int i = 0; i < scaleImage.getWidth(); i++) { for (int j = 0; j < scaleImage.getHeight(); j++) { srcPixels[i][j] = scaleImage.getRGB(i, j); } } Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>(); hint.put(EncodeHintType.CHARACTER_SET, "utf-8"); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 生成二维码 BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hint); // 二维矩阵转为一维像素数组 int halfW = matrix.getWidth() / 2; int halfH = matrix.getHeight() / 2; int[] pixels = new int[width * height]; for (int y = 0; y < matrix.getHeight(); y++) { for (int x = 0; x < matrix.getWidth(); x++) { // 左上角颜色,根据自己需要调整颜色范围和颜色 if (x > 0 && x < 170 && y > 0 && y < 170) { Color color = new Color(231, 144, 56); int colorInt = color.getRGB(); pixels[y * width + x] = matrix.get(x, y) ? colorInt : 16777215; } // 读取图片 else if (x > halfW - IMAGE_HALF_WIDTH && x < halfW + IMAGE_HALF_WIDTH && y > halfH - IMAGE_HALF_WIDTH && y < halfH + IMAGE_HALF_WIDTH) { pixels[y * width + x] = srcPixels[x - halfW + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH]; } else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH) || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH && y > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH) || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH - IMAGE_HALF_WIDTH + FRAME_WIDTH) || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH)) { pixels[y * width + x] = 0xfffffff; // 在图片四周形成边框 } else { // 二维码颜色 int num1 = (int) (50 - (50.0 - 13.0) / matrix.getHeight() * (y + 1)); int num2 = (int) (165 - (165.0 - 72.0) / matrix.getHeight() * (y + 1)); int num3 = (int) (162 - (162.0 - 107.0) / matrix.getHeight() * (y + 1)); Color color = new Color(num1, num2, num3); int colorInt = color.getRGB(); // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色； pixels[y * width + x] = matrix.get(x, y) ? colorInt : 16777215; // 0x000000:0xffffff } } } BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); image.getRaster().setDataElements(0, 0, width, height, pixels); return image; } private static BufferedImage scale(String srcImageFile, int height, int width, boolean hasFiller) throws IOException { double ratio = 0.0; // 缩放比例 File file = new File(srcImageFile); BufferedImage srcImage = ImageIO.read(file); Image destImage = srcImage.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); // 计算比例 if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) { if (srcImage.getHeight() > srcImage.getWidth()) { ratio = (new Integer(height)).doubleValue() / srcImage.getHeight(); } else { ratio = (new Integer(width)).doubleValue() / srcImage.getWidth(); } AffineTransformOp op = new AffineTransformOp( AffineTransform.getScaleInstance(ratio, ratio), null); destImage = op.filter(srcImage, null); } if (hasFiller) { // 补白 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D graphic = image.createGraphics(); graphic.setColor(Color.white); graphic.fillRect(0, 0, width, height); if (width == destImage.getWidth(null)) graphic.drawImage(destImage, 0, (height - destImage.getHeight(null)) / 2, destImage.getWidth(null), destImage.getHeight(null), Color.white, null); else graphic.drawImage(destImage, (width - destImage.getWidth(null)) / 2, 0, destImage.getWidth(null), destImage.getHeight(null), Color.white, null); graphic.dispose(); destImage = image; } return (BufferedImage) destImage; } public static void main(String[] args) throws UnsupportedEncodingException { // 依次为内容(不支持中文),宽,长,中间图标路径,储存路径 MatrixToImageWriter.encode("http://www.baidu.com/", 512, 512, "D:logo.png", "D:2013-01.jpg"); } }
以上就是本文的全部内容，帮助大家设计属于自己的二维码。
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