java生成彩色二维码，附带中心logo

利用java生成二维码需要导入两个jar包，前往以下网址下载即可
http://repo1.maven.org/maven2/com/google/zxing

效果图

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;     //左上角背景色}// 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;// 二维码中心所插入图片的边框颜色} 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));//二维码前景色（不包含左上角），可修改数值（数值不得超过255）Color color = new Color(num1, num2, num3);int colorInt = color.getRGB();pixels[y * width + x] = matrix.get(x, y) ? colorInt: 16777215;//二维码背景色// 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);elsegraphic.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,"F:\\QRcode\\web\\img\\touxiang.jpg", "F:\\QRcode\\web\\images\\QRcode.jpg");   }
}

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