java生成二维码

使用开源的一维/二维码图形处理库zxing GayHub地址

引入依赖

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

封装工具类

package com.app.utils;
 
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
 
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
/**
 * @title 生成二维码工具类
 * @author zch
 * @discribtion
 * @Date 2020年1月3日 下午4:26:05
 * @vision V1.0
 */
public class QRCodeUtil
{
    private static final int width = 200; // 图像宽度
    
    private static final int height = 200; // 图像高度
    
    private static final int ON_COLOR = 0xFF000001;
    
    private static final int OFF_COLOR = 0xFFFFFFFF;
    
    /**
     * @title 生成二维码图片
     * @discribtion
     * @author zch
     * @Date 2020年1月3日 下午3:27:21
     * @param width 二维码宽度,默认为200
     * @param height 二维码高度,默认为200
     * @param content 二维码内容,必填
     * @param logoPath logo图片路径,若为空则生成不带logo的二维码
     * @param imgPath 生成二维码文件夹路径
     * @param imgName 生成二维码图片名称,必填
     * @param suffix 生成二维码图片后缀类型,例如:gif,必填
     * @vision V1.0
     */
    public static boolean generateQRImage(Integer width, Integer height, String content, String logoPath, String imgPath, String imgName, String suffix)
    {
        if (content == null || imgName == null || suffix == null)
        {
            return false;
        }
        try
        {
            width = width == null ? QRCodeUtil.width : width;
            height = height == null ? QRCodeUtil.height : height;
            if (logoPath != null && !"".equals(logoPath.trim()))
            {
                QREncode(width, height, content, logoPath, imgPath, imgName, suffix);
            }
            else
            {
                QREncode(width, height, content, imgPath, imgName, suffix);
            }
            return true;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return false;
        }
    }
    
    /**
     * @title 生成二维码
     * @discribtion
     * @author zch
     * @Date 2020年1月3日 下午3:27:21
     * @vision V1.0
     */
    private static void QREncode(int width, int height, String content, String imgPath, String imgName, String suffix)
        throws Exception
    {
        File filePath = new File(imgPath);
        if (!filePath.exists())
        {
            filePath.mkdirs();
        }
        File imageFile = new File(imgPath, imgName);
        Map<EncodeHintType, Object> hints = new HashMap<>();
        // 内容编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置二维码边的空度,非负数
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        MatrixToImageWriter.writeToPath(bitMatrix, suffix, imageFile.toPath());// 输出原图片
    }
    
    /**
     * @title 生成带logo的二维码
     * @discribtion
     * @author zch
     * @Date 2020年1月3日 下午3:27:21
     * @vision V1.0
     */
    private static void QREncode(int width, int height, String content, String logoPath, String imgPath, String imgName, String suffix)
        throws Exception
    {
        File filePath = new File(imgPath);
        if (!filePath.exists())
        {
            filePath.mkdirs();
        }
        File imageFile = new File(imgPath, imgName);
        Map<EncodeHintType, Object> hints = new HashMap<>();
        // 内容编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置二维码边的空度,非负数
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        MatrixToImageConfig matrixToImageConfig = new MatrixToImageConfig(ON_COLOR, OFF_COLOR);
        BufferedImage bufferedImage = LogoMatrix(MatrixToImageWriter.toBufferedImage(bitMatrix, matrixToImageConfig), new File(logoPath));
        ImageIO.write(bufferedImage, suffix, imageFile);// 输出带logo图片
    }
    
    /**
     * @title 二维码图片添加logo
     * @discribtion  
     * @author zch
     * @Date 2020年1月3日 下午3:27:21
     * @param matrixImage 源二维码图片
     * @param logoFile logo图片
     * @vision V1.0
     */
    private static BufferedImage LogoMatrix(BufferedImage matrixImage, File logoFile)
        throws IOException
    {
        // 读取二维码图片,并构建绘图对象
        Graphics2D gs = matrixImage.createGraphics();
        int matrixWidth = matrixImage.getWidth();
        int matrixHeigh = matrixImage.getHeight();
        int ratioWidth = matrixWidth * 2 / 10;
        int ratioHeight = matrixHeigh * 2 / 10;
        // 读取Logo图片
        BufferedImage logo = ImageIO.read(logoFile);
        int logoWidth = logo.getWidth(null) > ratioWidth ? ratioWidth : logo.getWidth(null);
        int logoHeight = logo.getHeight(null) > ratioHeight ? ratioHeight : logo.getHeight(null);
        int x = (matrixWidth - logoWidth) / 2;
        int y = (matrixHeigh - logoHeight) / 2;
        
        // 绘制
        gs.drawImage(logo, x, y, logoWidth, logoHeight, null);
        gs.setColor(Color.BLACK);
        gs.setBackground(Color.WHITE);
 
        gs.dispose();
        matrixImage.flush();
        return matrixImage;
    }
}

测试生成二维码

QRCodeUtil.generateQRImage(null, null, "https://blog.csdn.net/qq_34928194", null, "E:/", "test.gif", "gif");

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