Java生成带logo的二维码

柔光的暖阳◎ 2023-08-17 17:43 73阅读 0赞

使用纯Java生成二维码，首先需要引入jar包：core-x.x.x(com.google.zxing),下载地址：[https://mvnrepository.com/artifact/com.google.zxing/core/3.3.0][https_mvnrepository.com_artifact_com.google.zxing_core_3.3.0]

代码都写了注释，二维码的工具类:

package QR_Code.zxing;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.util.HashMap;
    import java.util.Hashtable;
    import java.util.Map;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.Binarizer;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.LuminanceSource;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    import jp.sourceforge.qrcode.util.Color;
    
    /** zxing二维码的工具类 */
    public class ZXingUtil { 
    	
    	/** 加密生成二维码： * @throws Exception * content :需要加密的字符串 * BarcodeFormat.QR_CODE： 需要解析的类型(二维码) * hints: 存放加密涉及的一些参数(编码、排错率等) * */
    	public static  void encodeImg(String imgPath,String format,String content,int width,int height,String logo) throws Exception { 
    		Hashtable<EncodeHintType,Object> hints = new Hashtable<>();
    		//排错率 ：L<M<Q<H
    		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    		//编码格式
    		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    		//外边距
    		hints.put(EncodeHintType.MARGIN, 1);
    		
    		BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height,hints);
    		
    		//内存中的图片:此时需要的图片是二维码，而二维码则需要一个 boolean[][] -->com.google.zxing.common.BitMatrix
    		BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    		for(int x=0; x<width; x++) { 
    			for(int y=0; y<height; y++) { 
    				img.setRGB(x, y, (bitMatrix.get(x, y) ? Color.BLACK :Color.WHITE));
    			}
    		}
    		
    		//画 logo
    		img = LogoUtil.logoMatrix(img, logo);
    		
    		//String -> file
    		File file = new File(imgPath);
    		//生成图片
    		ImageIO.write(img, format, file);
    	}
    	
    	
    	/** * 解码 * @param file * @throws Exception */
    	@SuppressWarnings({  "unchecked", "rawtypes" })
    	public static void decodeImg(File file) throws Exception { 
    		if(!file.exists()) return ;
    		// 读取到内存
    		BufferedImage image = ImageIO.read(file);
    		
    		MultiFormatReader formatReader = new MultiFormatReader();
    		
    		LuminanceSource source = new BufferedImageLuminanceSource(image);
    		Binarizer binarizer = new HybridBinarizer(source);
    		BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
    		
    		Map map = new HashMap<>();
    		
    		map.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    		Result result = formatReader.decode(binaryBitmap,map);
    		System.err.println("解析结果："+result.toString());
    	}
    	
    }

添加 logo的工具类：

package QR_Code.zxing;
    
    import java.awt.BasicStroke;
    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    
    import javax.imageio.ImageIO;
    
    /** logo类 */
    public class LogoUtil { 
    	//传入logo、二维码 ->带logo的二维码
    	public static BufferedImage logoMatrix(BufferedImage matrixImage,String logo) throws Exception { 
    		// 产生一个二维码画板
    		Graphics2D g2 = matrixImage.createGraphics();
    		
    		//String -> BufferedImage(内存缓冲区的图片)
    		BufferedImage logoImg = ImageIO.read(new File(logo));
    		
    		int height = matrixImage.getHeight();
    		int width = matrixImage.getWidth();
    		//纯logo图片 参数(logo图，2/5x,y轴位置(横轴纵轴的2/5的位置)，1/5是宽高(占整个二维码图片对应的1/5), null)
    		g2.drawImage(logoImg, width*2/5, height*2/5, width*1/5, height*1/5, null);
    		//产生一个画笔 画白色圆角正方形 参数(5, 笔尖类型 ,连接处的形状 JOIN_ROUND 圆滑)
    		BasicStroke stroke = new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
    		g2.setStroke(stroke);
    		//创建一个正方形(存放logo的正方形)
    		RoundRectangle2D.Float  round = new RoundRectangle2D.Float( width*2/5, height*2/5, width*1/5, height*1/5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
    		g2.setColor(Color.WHITE);
    		g2.draw(round);
    		
    		//灰色边框
    		BasicStroke stroke2 = new BasicStroke(1, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
    		g2.setStroke(stroke2);
    		//再来一个正方形(logo覆盖的正方形),位置参数微调
    		RoundRectangle2D.Float  round2 = new RoundRectangle2D.Float( width*2/5+2, height*2/5+2, width*1/5-4, height*1/5-4, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
    		g2.setColor(Color.GRAY);//灰色
    		//也可以这样设置颜色
    // Color color = new Color(128,128,128);
    		g2.draw(round2);
    		g2.dispose();
    		matrixImage.flush();
    		return matrixImage;
    	}
    }

最后是测试类：

package QR_Code.zxing;
    
    import java.io.File;
    
    /**zxing方式的二维码*/
    public class Test { 
    	public static void main(String[] args) throws Exception { 
    		//将要生成的二维码的路径
    		String imgPath = "src/zxing二维码.gif";
    		//二维码图片中加密的内容
    		String content = "helloworld";
    		//logo图片
    		String logo = "src/logo.png";
    		//生成二维码
    		ZXingUtil.encodeImg(imgPath, "gif", content, 430, 430,logo);
    		
    		//解码
    		ZXingUtil.decodeImg(new File(imgPath));
    	}
    }

[https_mvnrepository.com_artifact_com.google.zxing_core_3.3.0]: https://mvnrepository.com/artifact/com.google.zxing/core/3.3.0