通过 zxing 生成二维码

• 概述

　　二维码现在随处可见，在日常的开发中，也会经常涉及到二维码的生成，特别是开发一些活动或者推广方面的功能时，二维码甚至成为必备功能点。本文介绍通过 google 的 zxing 包生成带 logo 的二维码的过程，供大家参考。完整的 demo ,请查看我的 github https://github.com/RexFang/qr_code

• pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>qr_code</groupId>
  <artifactId>qr_code</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
    <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>3.0.0</version>  
    </dependency>
    
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.4</version>
    </dependency>
  </dependencies>
</project>

• 文件工具类 FileUtil

package util;

import java.io.File;

import org.apache.commons.lang3.StringUtils;

public class FileUtil {
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:25:04
     * @param dir
     * void
     * TODO 判断路径是否存在，如果不存在则创建
     */
    public static void mkdirs(String dir){
        if(StringUtils.isEmpty(dir)){
            return;
        }
        
        File file = new File(dir);
        if(file.isDirectory()){
            return;
        } else {
            file.mkdirs();
        }
    }
}

• 二维码工具类 QRCodeUtil

package qrcode;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
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 util.FileUtil;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
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;


public class QRCodeUtil {
    private static final String CHARSET = "UTF-8";  
    private static final String FORMAT_NAME = "JPG";  
    // 二维码尺寸  
    private static final int QRCODE_SIZE = 200;  
    // LOGO宽度  
    private static final int WIDTH = 60;  
    // LOGO高度  
    private static final int HEIGHT = 60; 
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:31:29
     * @param content 二维码内容
     * @param logoImgPath Logo
     * @param needCompress 是否压缩Logo
     * @return 返回二维码图片
     * @throws WriterException
     * @throws IOException
     * BufferedImage
     * TODO 创建二维码图片
     */
    private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress) throws WriterException, IOException {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();  
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);  
        hints.put(EncodeHintType.MARGIN, 1);  
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);  
        int width = bitMatrix.getWidth();  
        int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);  
            }  
        }  
        if (logoImgPath == null || "".equals(logoImgPath)) {  
            return image;  
        }  
        
        // 插入图片  
        QRCodeUtil.insertImage(image, logoImgPath, needCompress);  
        return image;  
    }
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:30:09
     * @param source 二维码图片
     * @param logoImgPath Logo
     * @param needCompress 是否压缩Logo
     * @throws IOException
     * void
     * TODO 添加Logo
     */
    private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException{
        File file = new File(logoImgPath);  
        if (!file.exists()) {  
            return;  
        }  
        
        Image src = ImageIO.read(new File(logoImgPath));  
        int width = src.getWidth(null);  
        int height = src.getHeight(null);  
        if (needCompress) { // 压缩LOGO  
            if (width > WIDTH) {  
                width = WIDTH;  
            }  
            
            if (height > HEIGHT) {  
                height = HEIGHT;  
            }  
            
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);  
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
            Graphics g = tag.getGraphics();  
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图  
            g.dispose();  
            src = image;  
        }  
        
        // 插入LOGO  
        Graphics2D graph = source.createGraphics();  
        int x = (QRCODE_SIZE - width) / 2;  
        int y = (QRCODE_SIZE - height) / 2;  
        graph.drawImage(src, x, y, width, height, null);  
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);  
        graph.setStroke(new BasicStroke(3f));  
        graph.draw(shape);  
        graph.dispose();  
    }
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:32:32
     * @param content 二维码内容
     * @param logoImgPath Logo
     * @param destPath 二维码输出路径
     * @param needCompress 是否压缩Logo
     * @throws Exception
     * void
     * TODO 生成带Logo的二维码
     */
    public static void encode(String content, String logoImgPath, String destPath, boolean needCompress) throws Exception {  
        BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);  
        FileUtil.mkdirs(destPath);  
        ImageIO.write(image, FORMAT_NAME, new File(destPath));  
    }   
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:35:44
     * @param content 二维码内容
     * @param destPath 二维码输出路径
     * @throws Exception
     * void
     * TODO 生成不带Logo的二维码
     */
    public static void encode(String content, String destPath) throws Exception {  
        QRCodeUtil.encode(content, null, destPath, false);  
    }  
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:36:58
     * @param content 二维码内容
     * @param logoImgPath Logo
     * @param output 输出流
     * @param needCompress 是否压缩Logo
     * @throws Exception
     * void
     * TODO 生成带Logo的二维码，并输出到指定的输出流
     */
    public static void encode(String content, String logoImgPath, OutputStream output, boolean needCompress) throws Exception {  
        BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);  
        ImageIO.write(image, FORMAT_NAME, output);  
    }  
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:38:02
     * @param content 二维码内容
     * @param output 输出流
     * @throws Exception
     * void
     * TODO 生成不带Logo的二维码，并输出到指定的输出流
     */
    public static void encode(String content, OutputStream output) throws Exception {  
        QRCodeUtil.encode(content, null, output, false);  
    }  
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:39:10
     * @param file 二维码
     * @return 返回解析得到的二维码内容
     * @throws Exception
     * String
     * TODO 二维码解析
     */
    public static String decode(File file) throws Exception {  
        BufferedImage image;  
        image = ImageIO.read(file);  
        if (image == null) {  
            return null;  
        }  
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);  
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));  
        Result result;  
        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();  
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);  
        result = new MultiFormatReader().decode(bitmap, hints);  
        String resultStr = result.getText();  
        return resultStr;  
    }  
    
    /**
     * user: Rex
     * date: 2016年12月29日  上午12:39:48
     * @param path 二维码存储位置
     * @return 返回解析得到的二维码内容
     * @throws Exception
     * String
     * TODO 二维码解析
     */
    public static String decode(String path) throws Exception {  
        return QRCodeUtil.decode(new File(path));  
    } 
}

• 测试类 QRCodeUtilTest

package test;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import org.junit.Before;
import org.junit.Test;

import qrcode.QRCodeUtil;

public class QRCodeUtilTest {

    @Before
    public void setUp() throws Exception {
    }

    @Test
    public void testEncode() throws FileNotFoundException, Exception {
        String dir = "H:/Users/Administrator/Desktop/1.jpg";
        String content = "http://www.cnblogs.com/rexfang/";
        String logoImgPath = "H:/Users/Administrator/Desktop/logo.png";
        File file = new File(dir);
        QRCodeUtil.encode(content, logoImgPath, new FileOutputStream(file), true);
    }

}

• 结果

　　　　　　

　　　完整的 demo ,请查看我的 github https://github.com/RexFang/qr_code

  欢迎转载，转载必须标明出处