Java生成二维码之zxing

pom.xml:

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.2.1</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.2.1</version>
</dependency>

代码:

package com.demo.qrcode;
 
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
 
import javax.imageio.ImageIO;
 
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
 
import com.demo.logger.Logger;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
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.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
/**
 * 二维码工具
 */
public class QRCodeUtils {
 
    public static void main(String[] args) {
        long b = System.currentTimeMillis();
        encode("https://www.baidu.com", 300, 300, 1, "D:\\yy.png", "D:\\code.png");
//      System.out.println(decode("D:\\code.png"));
        long e = System.currentTimeMillis();
        System.out.println(e - b);
    }
 
    private final static int LOGO_MAX_WH = 40; // LOGO最大高宽
     
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于表示默认
     * @param codePath 输出地址
     */
    public static void encode(String content, int width, int height, int margin, String codePath) {
        encode(content, width, height, margin, null, null, null, codePath);
    }
     
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于表示默认
     * @param os 输出流
     */
    public static void encode(String content, int width, int height, int margin, OutputStream os) {
        encode(content, width, height, margin, null, null, null, os);
    }
     
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于表示默认
     * @param logoPath logo地址:可以为空
     * @param codePath 输出地址
     */
    public static void encode(String content, int width, int height, int margin, String logoPath, String codePath) {
        encode(content, width, height, margin, null, null, logoPath, codePath);
    }
     
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于表示默认
     * @param logoPath logo地址:可以为空
     * @param os 输出流
     */
    public static void encode(String content, int width, int height, int margin, String logoPath, OutputStream os) {
        encode(content, width, height, margin, null, null, logoPath, os);
    }
     
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于0表示默认
     * @param level 容错率:可以为空
     * @param charset 编码:默认UTF-8
     * @param logoPath logo地址:可以为空
     * @param codePath 输出地址
     */
    public static void encode(String content, int width, int height, int margin, ErrorCorrectionLevel level, String charset, String logoPath, String codePath) {
        if (StringUtils.isEmpty(codePath))
            return;
        OutputStream os = null;
        try {
            os = new FileOutputStream(new File(codePath));
            encode(content, width, height, margin, level, charset, logoPath, os);
        } catch (FileNotFoundException e) {
            Logger.error(QRCodeUtils.class, "打开输出流错误", e);
        } finally {
            IOUtils.closeQuietly(os);
        }
    }
 
    /**
     * 生成二维码
     * @param content 图片地址
     * @param width 图片宽度
     * @param height 图片高度
     * @param margin 边距:小于0表示默认
     * @param level 容错率:可以为空
     * @param charset 编码:默认UTF-8
     * @param logoPath logo地址:可以为空
     * @param os 输出流
     */
    public static void encode(String content, int width, int height, int margin, ErrorCorrectionLevel level, String charset, String logoPath, OutputStream os) {
        if (StringUtils.isEmpty(content) || os == null)
            return;
        Graphics2D graphics2d = null;
        BufferedImage logoImage = null;
        BufferedImage codeImage = null;
        try {
            Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
            if(margin >= 0)
                hints.put(EncodeHintType.MARGIN, margin); // 边距
            if(level != null)
                hints.put(EncodeHintType.ERROR_CORRECTION, level); // 容错率
            if(StringUtils.isNotEmpty(charset))
                hints.put(EncodeHintType.CHARACTER_SET, charset); // 编码
            else
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // 编码
            MultiFormatWriter formatWriter = new MultiFormatWriter();
            BitMatrix bitMatrix = formatWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            codeImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
//          graphics2d = codeImage.createGraphics();
            BufferedImage target = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); // 设置ARGB颜色
            graphics2d = target.createGraphics();
            graphics2d.drawImage(codeImage, 0, 0, null); // 画二维码
            if (StringUtils.isNotEmpty(logoPath)) { // 画logo
                logoImage = ImageIO.read(new File(logoPath));
                int logoWidth = logoImage.getWidth() > LOGO_MAX_WH ? LOGO_MAX_WH : logoImage.getWidth();
                int logoHeight = logoImage.getHeight() > LOGO_MAX_WH ? LOGO_MAX_WH : logoImage.getHeight();
                int marginLeft = (width - logoWidth) / 2;
                int marginTop = (height - logoHeight) / 2;
                graphics2d.drawImage(logoImage.getScaledInstance(logoWidth, logoHeight, Image.SCALE_SMOOTH), marginLeft, marginTop, null);
            }
            target.flush();
            ImageIO.write(target, "png", os);
        } catch (WriterException e) {
            Logger.error(QRCodeUtils.class, "二维码生成错误", e);
        } catch (IOException e) {
            Logger.error(QRCodeUtils.class, "二维码生成错误", e);
        } finally {
            if(graphics2d != null)
                graphics2d.dispose();
        }
    }
 
    /**
     * 解析二维码
     * @param codePath 图片地址
     * @return 内容
     */
    public static String decode(String codePath) {
        return decode(codePath, null);
    }
     
    /**
     * 解析二维码
     * @param codePath 图片地址
     * @param charset 编码
     * @return 内容
     */
    public static String decode(String codePath, String charset) {
        if (StringUtils.isEmpty(codePath))
            return null;
        File file = new File(codePath);
        if (!file.exists() || !file.isFile())
            return null;
        BufferedImage image;
        try {
            image = ImageIO.read(file);
            return decode(image, charset);
        } catch (IOException e) {
            Logger.error(QRCodeUtils.class, "二维码图片文件读取错误", e);
        }
        return null;
    }
 
    /**
     * 二维码解析
     * @param image 图片流
     * @param charset 编码
     * @return 内容
     */
    public static String decode(BufferedImage image, String charset) {
        MultiFormatReader formatReader = new MultiFormatReader();
        LuminanceSource source = new BufferedImageLuminanceSource(image);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
        Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
        if(StringUtils.isEmpty(charset))
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
        else
            hints.put(DecodeHintType.CHARACTER_SET, charset);
        Result result = null;
        try {
            result = formatReader.decode(binaryBitmap, hints);
            return result.getText();
        } catch (NotFoundException e) {
            Logger.error(QRCodeUtils.class, "二维码解析错误", e);
        }
        return null;
    }
 
}

完整代码:http://svn.acgist.com/open/study/src/main/java/com/acgist/qrcode/QRCodeUtils.java

不过边距有时候会无效。