微信支付二维码上添加logo

工具类的使用，分享给大家。先看效果：

无logo时：

有logo时：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

/**
 * @Date 创建时间： 2020-11-03 09:54
 * @Author 作者姓名: Liux
 * @Version 1.0
 * @Copyright Copyright by
 * @Direction 类说明 二维码写入到本地文件、或者二维码写入到流、以及二维码加入logo的操作
 */
public class QRCodeUtil {

	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private QRCodeUtil() {
	}

	private static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}

	/***
	 * 文件方式生成
	 * @param matrix
	 * @param format
	 * @param file
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}


	/***
	 * 文件方式生成
	 * @param matrix
	 * @param format
	 * @param file
	 * @throws IOException
	 */
	public static void writeLogoToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		//设置logo图标
		image = QRLogoConfig.LogoMatrix( image );
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}

	/***
	 * 流方式生成 - 普通版本
	 * @param matrix
	 * @param format
	 * @param stream
	 * @throws IOException
	 */
	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}
	
	/***
	 * 流方式生成 - 待logo版本
	 * @param matrix
	 * @param format
	 * @param stream
	 * @throws IOException
	 */
	public static void writeLogoToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		//设置logo图标
		BufferedImage logoImage = QRLogoConfig.LogoMatrix( image );
		File outputFile = new File("D:" + File.separator + "new.gif");
		ImageIO.write(image, format, outputFile ) ;
		if ( !ImageIO.write( logoImage , format, stream ) ) {
			throw new IOException("Could not write an image of format " + format);
		}
	}

	public static void main(String[] args) throws Exception {
		String text = "http://www.baidu.com";
		int width = 300;
		int height = 300;
		// 二维码的图片格式
		String format = "gif";
		Hashtable hints = new Hashtable();
		// 内容所使用编码
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
		// 生成二维码
		File outputFile = new File("D:" + File.separator + "new.gif");
		QRCodeUtil.writeToFile(bitMatrix, format, outputFile);
		QRCodeUtil.writeLogoToFile(bitMatrix, format, outputFile);
	}

}

import org.springframework.core.io.ClassPathResource;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;

/**
 * @Date 创建时间： 2020-11-03 10:09
 * @Author 作者姓名: Liux
 * @Version 1.0
 * @Copyright Copyright by
 * @Direction 类说明
 * 二维码 添加 logo图标 处理的方法,
 * 模仿微信自动生成二维码效果，有圆角边框，logo和二维码间有空白区，logo带有灰色边框
 */
public class QRLogoConfig {

    /***
     * 微信支付时使用的logo最好不要超过 45 * 45，否则有概率扫一扫识别不成功
     */
    private static int logo_width = 45 ;
    private static int logo_height = 45 ;

    /**
     * 设置 logo
     * @param matrixImage 源二维码图片
     * @return 返回带有logo的二维码图片
     * @throws IOException
     * @author
     */
    public static BufferedImage LogoMatrix(BufferedImage matrixImage) throws IOException{
        //读取Logo图片 - springboot resource下面的文件夹下读取配置
        ClassPathResource classPathResource = new ClassPathResource("static/common/img/logo.png");
        InputStream inputStream = classPathResource.getInputStream();
        BufferedImage logoImage = ImageIO.read( inputStream );
        return mergeImage( matrixImage , logoImage , null ) ;
    }

    /**
     * 待合并的两张图必须满足这样的前提，如果水平方向合并，则高度必须相等；如果是垂直方向合并，宽度必须相等。
     * mergeImage方法不做判断，自己判断。
     *
     * @param logoImage
     *            待合并的第一张图
     * @param targetImage
     *            带合并的第二张图
     * @param isHorizontal
     *            为true时表示水平方向合并，为false时表示垂直方向合并
     * @return 返回合并后的BufferedImage对象
     * @throws IOException
     */
    public static BufferedImage mergeImage( BufferedImage targetImage, BufferedImage logoImage, String isHorizontal) throws IOException {
        int w1 = targetImage.getWidth();
        int h1 = targetImage.getHeight();
        int w2 = logoImage.getWidth();
        int h2 = logoImage.getHeight();
        logo_width = w2 ;
        logo_height = h2 ;

        // 从图片中读取RGB
        int[] ImageArrayOne = new int[w1 * h1];
        ImageArrayOne = targetImage.getRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 逐行扫描图像中各个像素的RGB到数组中
        int[] ImageArrayTwo = new int[w2 * h2];
        ImageArrayTwo = logoImage.getRGB(0, 0, w2, h2, ImageArrayTwo, 0, w2);

        // 生成新图片
        BufferedImage DestImage = null;
        if(isHorizontal==null){
            if(true){
                DestImage = new BufferedImage(w1, h1, BufferedImage.TYPE_INT_RGB);
                //第一步-画出底图的信息
                DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
                //第二步-画出logo图片的信息，开始的坐标，长宽设置
                int startX = ( w1 / 2 ) - (logo_width / 2) ;
                int starty = ( h1 / 2 ) - (logo_height / 2) ;
                DestImage.setRGB( startX,starty, logo_width ,logo_height , ImageArrayTwo, 0, logo_width );
            }
        }else  if (isHorizontal.equals("1")) { // 水平方向合并
            DestImage = new BufferedImage(w1+w2, h1, BufferedImage.TYPE_INT_RGB);
            DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
            DestImage.setRGB(w1, 20, w2, h2, ImageArrayTwo, 0, w2);
        } else if(isHorizontal.equals("2")) { // 垂直方向合并
            DestImage = new BufferedImage(w1, h1 + h2,
                    BufferedImage.TYPE_INT_RGB);
            DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
            DestImage.setRGB(0, h1, w2, h2, ImageArrayTwo, 0, w2); // 设置下半部分的RGB
        }

        return DestImage;
    }

}

依赖的Maven包：
<!-- google二维码 -->
<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.1.0</version>
</dependency>

微信二维码支付时调用：

//二维码宽高
int width=300,height=300 ;
//微信统一下单后，返回的二维码内容字符
String text = "" ;
//二维码的图片格式
String format = "gif";
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
//内容所使用编码
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
//生成简单二维码
//QRCodeUtil.writeToStream(bitMatrix, format, response.getOutputStream());
//生成二维码带logo
QRCodeUtil.writeLogoToStream(bitMatrix, format, response.getOutputStream());