添加依赖
com.google.zxing
javase
3.3.0
QRCodeUtils工具类
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;
import javax.imageio.ImageIO;
import java.awt.*;
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.util.HashMap;
import java.util.Map;
public class QRCodeUtil {
private static final int LOGO_WIDTH = 50;
private static final int LOGO_HEIGHT = 50;
private static final int IMAGE_WIDTH = 300;
private static final int IMAGE_HEIGHT = 300;
private static final int IMAGE_HALF_WIDTH = LOGO_WIDTH / 2;
private static final int FRAME_WIDTH = 2;
private static final String srcImagePath = "图片地址";
private static final MultiFormatWriter mutiWriter = new MultiFormatWriter();
public static BufferedImage genBarcode(String content)
throws WriterException, IOException {
BufferedImage scaleImage = scale(srcImagePath);
int[][] srcPixels = new int[LOGO_WIDTH][LOGO_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 hint = new HashMap<>();
hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hint.put(EncodeHintType.MARGIN, 0);
// 生成二维码
BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE, IMAGE_WIDTH, IMAGE_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[IMAGE_WIDTH * IMAGE_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 < 55 && y > 0 && y < 55) {
Color color = new Color(231, 144, 56);
int colorInt = color.getRGB();
pixels[y * IMAGE_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 * IMAGE_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 * IMAGE_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) (200 - (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 * IMAGE_WIDTH + x] = matrix.get(x, y) ? colorInt : 16777215;
// 0x000000:0xffffff
}
}
}
BufferedImage image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
image.getRaster().setDataElements(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, pixels);
return image;
}
private static BufferedImage scale(String srcImageFile) throws IOException {
// 缩放比例
double ratio;
File file = new File(srcImageFile);
BufferedImage srcImage = ImageIO.read(file);
Image destImage = srcImage.getScaledInstance(QRCodeUtil.LOGO_WIDTH, QRCodeUtil.LOGO_HEIGHT,
BufferedImage.SCALE_SMOOTH);
// 计算比例
if ((srcImage.getHeight() > QRCodeUtil.LOGO_WIDTH) || (srcImage.getWidth() > QRCodeUtil.LOGO_HEIGHT)) {
if (srcImage.getHeight() > srcImage.getWidth()) {
ratio = (new Integer(QRCodeUtil.LOGO_WIDTH)).doubleValue() / srcImage.getHeight();
} else {
ratio = (new Integer(QRCodeUtil.LOGO_HEIGHT)).doubleValue() / srcImage.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
destImage = op.filter(srcImage, null);
}
// 补白
BufferedImage image = new BufferedImage(QRCodeUtil.LOGO_WIDTH, QRCodeUtil.LOGO_HEIGHT,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image.createGraphics();
graphic.setColor(Color.white);
graphic.fillRect(0, 0, QRCodeUtil.LOGO_WIDTH, QRCodeUtil.LOGO_HEIGHT);
if (QRCodeUtil.LOGO_HEIGHT == destImage.getWidth(null))
graphic.drawImage(destImage, 0, (QRCodeUtil.LOGO_WIDTH - destImage.getHeight(null)) / 2,
destImage.getWidth(null), destImage.getHeight(null), Color.white, null);
else
graphic.drawImage(destImage, (QRCodeUtil.LOGO_HEIGHT - destImage.getWidth(null)) / 2, 0,
destImage.getWidth(null), destImage.getHeight(null), Color.white, null);
graphic.dispose();
destImage = image;
return (BufferedImage) destImage;
}
}
