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zxing生成和解析带logo二维码

程序员文章站 2022-07-14 18:26:18
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首先我们引入相关jar包：

<!-- 二维码 -->
	<dependency>
		<groupId>com.google.zxing</groupId>
		<artifactId>core</artifactId>
		<version>3.3.0</version>
	</dependency>
	<dependency>
		<groupId>net.glxn</groupId>
		<artifactId>qrgen</artifactId>
		<version>1.4</version>
	</dependency>
	
	<!-- servlet -->
	<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>javax.servlet-api</artifactId>
		<version>3.1.0</version>
	</dependency>
编写工具类QRCodeUtil： 

package com.example.qrcode.util;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
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;

/**
 * 二维码生成和解析工具类
 * 
 * @author Administrator
 *
 */
public class QRCodeUtil {

	// 二维码颜色
	private static final int BLACK = 0xFF000000;
	// 二维码颜色
	private static final int WHITE = 0xFFFFFFFF;
	// 二维码图片格式
	private static final List<String> IMAGE_TYPE = new ArrayList<String>();

	static {
		IMAGE_TYPE.add("jpg");
		IMAGE_TYPE.add("png");
	}

	/**
	 * zxing方式生成二维码
	 * 注意：
	 * 1,文本生成二维码的方法独立出来,返回image流的形式,可以输出到页面
	 * 2,设置容错率为最高,一般容错率越高,图片越不清晰,但是只有设置高一点才能兼容logo图片
	 * 3,logo图片默认占二维码图片的20%,设置太大会导致无法解析 
	 * @param content 二维码包含的内容，文本或网址"Hello World"
	 * @param path 二维码图片目录"C:/Users/Administrator/Desktop/QRcode2/b.jpg"
	 * @param size 二维码图片尺寸 null or your size
	 * @param logoPath 插入图片目录
	 */
	public static boolean zxingCodeCreate(String content, String path, Integer size,String logoPath) {
		
		try {
			String imageType = path.substring(path.lastIndexOf(".") + 1).toLowerCase();
			if (!IMAGE_TYPE.contains(imageType)) {
				return false;
			}
			
			//获取二维码流的形式，写入到目录文件中
			BufferedImage image = getBufferedImage(content,size,logoPath);
			
			File file = new File(path);
			if (!file.exists()) {
				file.mkdirs();
			}
			ImageIO.write(image, imageType, file);
			
			return true;
			
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
		
	}

	/**
	 * 二维码流的形式，包含文本内容
	 * @param content 二维码文本内容
	 * @param size 二维码尺寸
	 * @return
	 */
	public static BufferedImage getBufferedImage (String content,Integer size,String logoPath) {

		if (size == null || size <= 0) {
			size = 250;
		}

		BufferedImage image = null;
		try {
			// 设置编码字符集
			Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
			//设置编码
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			//设置容错率最高
			hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
	        hints.put(EncodeHintType.MARGIN, 1);
			// 1、生成二维码
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, size, size, hints);
			
			// 2、获取二维码宽高
			int codeWidth = bitMatrix.getWidth();
			int codeHeight = bitMatrix.getHeight();
			
			// 3、将二维码放入缓冲流
			image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB);
			
			for (int i = 0; i < codeWidth; i++) {
				for (int j = 0; j < codeHeight; j++) {
					// 4、循环将二维码内容定入图片
					image.setRGB(i, j, bitMatrix.get(i, j) ? BLACK : WHITE);
				}
			}
			
			//判断是否写入logo图片
			if (logoPath != null && !"".equals(logoPath)) {
				File logoPic = new File(logoPath);
				if (logoPic.exists()) {
					Graphics2D g = image.createGraphics();
					BufferedImage logo = ImageIO.read(logoPic);
					int widthLogo = logo.getWidth(null) > image.getWidth() * 2 / 10 ? 
							(image.getWidth() * 2 / 10) : logo.getWidth(null);
					int heightLogo = logo.getHeight(null) > image.getHeight() * 2 / 10 ? 
							(image.getHeight() * 2 / 10) : logo.getHeight(null);
					int x = (image.getWidth() - widthLogo) / 2; 
					int y = (image.getHeight() - heightLogo) / 2;
					
					// 开始绘制图片
					g.drawImage(logo, x, y, widthLogo, heightLogo, null);
					g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
					//边框宽度
					g.setStroke(new BasicStroke(2));
					//边框颜色
					g.setColor(Color.WHITE);
					g.drawRect(x, y, widthLogo, heightLogo);
					
					g.dispose();
					logo.flush();
					image.flush();
				}
			}
			
		} catch (WriterException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return image;

	}
	

	/**
	 * 给二维码图片添加Logo
	 * 
	 * @param qrPic 二维码图片
	 * @param logoPic logo图片
	 * @param path 合成后的图片存储目录
	 */
	public static boolean zxingCodeCreate(File qrPic, File logoPic,String path) {
		try {
			String imageType = path.substring(path.lastIndexOf(".") + 1).toLowerCase();
			if (!IMAGE_TYPE.contains(imageType)) {
				return false;
			}
			if (!qrPic.isFile() && !logoPic.isFile()) {
				return false;
			}
			/**
			 * 读取二维码图片，并构建绘图对象
			 */
			BufferedImage image = ImageIO.read(qrPic);
			Graphics2D g = image.createGraphics();
			
			/**
			 * 读取Logo图片
			 */
			BufferedImage logo = ImageIO.read(logoPic);
			/**
			 * 设置logo的大小,最多20%0
			 */
			int widthLogo = logo.getWidth(null) > image.getWidth() * 2 / 10 ? 
					(image.getWidth() * 2 / 10) : logo.getWidth(null);
			int heightLogo = logo.getHeight(null) > image.getHeight() * 2 / 10 ? 
					(image.getHeight() * 2 / 10) : logo.getHeight(null);
					
			// 计算图片放置位置，默认在中间
			int x = (image.getWidth() - widthLogo) / 2; 
			int y = (image.getHeight() - heightLogo) / 2;
			
			// 开始绘制图片
			g.drawImage(logo, x, y, widthLogo, heightLogo, null);
			g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
			//边框宽度
			g.setStroke(new BasicStroke(2));
			//边框颜色
			g.setColor(Color.WHITE);
			g.drawRect(x, y, widthLogo, heightLogo);
			
			g.dispose();
			logo.flush();
			image.flush();
			
			File newFile = new File(path);
			if (!newFile.exists()) {
				newFile.mkdirs();
			}
			ImageIO.write(image, imageType,newFile);
			
			return true;
			
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}

	}

	/**
	 * zxing方式生成二维码的解析方法
	 * @param path 二维码图片目录
	 * @return
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static Result zxingCodeAnalyze(String path) {
		try {
			MultiFormatReader formatReader = new MultiFormatReader();
			File file = new File(path);
			if (file.exists()) {
				BufferedImage image = ImageIO.read(file);
				LuminanceSource source = new BufferedImageLuminanceSource(image);
				Binarizer binarizer = new HybridBinarizer(source);
				BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
				Map hints = new HashMap();
				hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
				Result result = formatReader.decode(binaryBitmap, hints);
				return result;
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (NotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}



	public static void main(String[] args) {
		QRCodeUtil.zxingCodeCreate("我爱生煎包", "C:/Users/Administrator/Desktop/QRcode/aaa.jpg", null,"C:/Users/Administrator/Desktop/QRcode/aa.png");
		
		Result result = QRCodeUtil.zxingCodeAnalyze("C:/Users/Administrator/Desktop/QRcode/aaa.jpg");
		System.out.println(result.toString());
		
	}
}
启动main函数，可以看到已成功生成二维码图片aaa.jpg，如下：

zxing生成和解析带logo二维码
下面我们实现在线生成二维码功能：

首先编写servlet java类：

package com.example.servlet;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.example.qrcode.util.QRCodeUtil;

/**
 * 使用servlet3.0提供的注解
 * @author Administrator
 *
 */
@WebServlet(urlPatterns="/qrcode/servlet")
public class QRcodeServlet extends HttpServlet{

	private static final long serialVersionUID = 6834622481464809081L;

	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setCharacterEncoding("utf-8");
		//生成二维码图片
		BufferedImage bufImage = QRCodeUtil.getBufferedImage("网页版二维码", null,"C:/Users/Administrator/Desktop/QRcode/aa.png");
		
		//直接打开图片
		resp.setContentType("image/jpg");
		//直接下载图片
//		resp.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("cc.jpg", "UTF-8"));
		//将图片写出到浏览器
		OutputStream out = resp.getOutputStream();
		ImageIO.write(bufImage, "jpg", out);
		out.close();
		
	}
}

启动服务测试访问：http://localhost:8088/qrCodeDemo/qrcode/servlet

zxing生成和解析带logo二维码



相关标签： 二维码

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