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Java 生成二维码及带logo的二维码

Java 生成二维码及带logo的二维码

作者: FX_SKY | 来源:发表于2017-07-28 15:36 被阅读786次

    使用ZXing 生成二维码及带logo的二维码。

    ZXing简介

    ZXing是一款开源的优秀二维码编码&解码库，支持javase和Android集成， github地址：https://github.com/zxing/zxing。

    效果图

    15.png

    maven依赖

    <dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

    代码实现

    1. QRCodeService

    package apple.springmvc.zxing.service;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import org.springframework.stereotype.Service;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Ricky Fung
 */
@Service
public class QRCodeService {

    private static final String CHARSET = "UTF-8";

    public File encode(String contents, int width, int height, File qrFile) {
        //生成条形码时的一些配置
        Map<EncodeHintType, Object> hints = new HashMap<>();
        // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 内容所使用字符集编码
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

        BitMatrix bitMatrix;
        try {
            OutputStream out = new FileOutputStream(qrFile);
            // 生成二维码
            bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
            MatrixToImageWriter.writeToStream(bitMatrix, "png", out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return qrFile;
    }

    public File encodeWithLogo(File qrFile, File logoFile, File newQrFile) {
        OutputStream os = null ;
        try {
            Image image2 = ImageIO.read(qrFile) ;
            int width = image2.getWidth(null) ;
            int height = image2.getHeight(null) ;
            BufferedImage bufferImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) ;
            //BufferedImage bufferImage =ImageIO.read(image) ;
            Graphics2D g2 = bufferImage.createGraphics();
            g2.drawImage(image2, 0, 0, width, height, null) ;
            int matrixWidth = bufferImage.getWidth();
            int matrixHeigh = bufferImage.getHeight();

            //读取Logo图片
            BufferedImage logo= ImageIO.read(logoFile);
            //开始绘制图片
            g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制
            BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
            g2.setStroke(stroke);// 设置笔画对象
            //指定弧度的圆角矩形
            RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);
            g2.setColor(Color.white);
            g2.draw(round);// 绘制圆弧矩形

            //设置logo 有一道灰色边框
            BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
            g2.setStroke(stroke2);// 设置笔画对象
            RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);
            g2.setColor(new Color(128,128,128));
            g2.draw(round2);// 绘制圆弧矩形

            g2.dispose();

            bufferImage.flush() ;
            os = new FileOutputStream(newQrFile) ;
            JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os) ;
            en.encode(bufferImage) ;

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(os!=null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return newQrFile ;
    }

    /**
     * ZXing解码
     * @param qrFile
     * @return
     */
    public String decode(File qrFile) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(qrFile);
            if (image == null) {
                System.out.println("the decode image may be not exit.");
            }
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            Map<DecodeHintType, Object> hints = new HashMap<>();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

            result = new MultiFormatReader().decode(bitmap, hints);
            return result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.getText() ;
    }
}

    2. QRCodeController

    package apple.springmvc.zxing.controller;

import apple.springmvc.zxing.model.User;
import apple.springmvc.zxing.service.QRCodeService;
import apple.springmvc.zxing.service.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.io.File;

/**
 * @author Ricky Fung
 */
@Controller
@RequestMapping("/qr")
public class QRCodeController {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private String uploadPath = "/images" ;
    private int width = 300;
    private int height = 300;

    @Autowired
    private UserService userService;

    @Autowired
    private QRCodeService qrCodeService;

    @RequestMapping(value = "/encode/{userId}", method = RequestMethod.GET)
    public ModelAndView genQR(@PathVariable Long userId, HttpServletRequest request){

        User user =  userService.getUser(userId);

        String realUploadPath = request.getServletContext().getRealPath(uploadPath);
        logger.info("realUploadPath:{}", realUploadPath);

        File uploadDir = new File(realUploadPath);
        if(!uploadDir.exists()) {
            uploadDir.mkdirs();
        }

        String imageName = String.format("%s_qr.png", userId);
        File qrFile = new File(uploadDir, imageName);
        qrCodeService.encode(user.toString(), width, height, qrFile);
        logger.info("生成的二维码文件:{}", qrFile.getAbsolutePath());


        File logoFile = new File(uploadDir, "logo.png");
        imageName = String.format("%s_qr_logo.png", userId);
        File logoQrFile = new File(uploadDir, imageName);
        qrCodeService.encodeWithLogo(qrFile, logoFile, logoQrFile);
        logger.info("生成的带logo二维码文件:{}", logoQrFile.getAbsolutePath());

        ModelAndView mv = new ModelAndView("show_qr");
        mv.addObject("userId", userId);
        mv.addObject("qrImage", uploadPath+"/"+qrFile.getName());
        mv.addObject("logoQRImage", uploadPath+"/"+logoQrFile.getName());
        return mv;
    }

    @RequestMapping(value = "/decode/{userId}", method = RequestMethod.GET)
    public ModelAndView decodeQR(@PathVariable Long userId, HttpServletRequest request){
        User user =  userService.getUser(userId);

        String realUploadPath = request.getServletContext().getRealPath(uploadPath) ;
        File uploadDir = new File(realUploadPath);

        String imageName = String.format("%s_qr.png", userId);
        File qrFile = new File(uploadDir, imageName);
        String result = qrCodeService.decode(qrFile);

        ModelAndView mv = new ModelAndView("decode_qr") ;
        mv.addObject("result", result);
        return mv;
    }
}

    3. spring-mvc.xml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven/>
    <context:component-scan base-package="apple.springmvc.zxing.controller">
    </context:component-scan>

    <mvc:resources location="/images/" mapping="/images/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>
    <mvc:default-servlet-handler />

    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
                  value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

    4. jsp页面

    4.1 show_qr.jsp

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>二维码与带Logo的二维码</title>
</head>
<body>
<div>
    <div align="center">
        <a href="${pageContext.request.contextPath}/qr/decode/${userId }">
            ![](${pageContext.request.contextPath}${qrImage})
            <b class="btn btn-success" >我要解码</b>
        </a>
    </div>
    <div align="center">
        <a href="${pageContext.request.contextPath}/qr/decode/${userId }">
            ![](${pageContext.request.contextPath}${logoQRImage})
            <b class="btn btn-success" >我要解码</b>
        </a>
    </div>
</div>
</body>
</html>

    4.2 decode_qr.jsp

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>二维码解码结果</title>
</head>
<body>
<div>
    <div align="center">
        <br><br>
        <p>${result}</p>
    </div>
</div>
</body>
</html>

    源码

    下载链接：https://github.com/TiFG/springmvc-tutorials/tree/master/springmvc-zxing-demo

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