条形码/二维码工具类

共享一个比较不错的小工具类，条形码，二维码的生成和解析

测试的时候记得在pom.xml中加入maven依赖

         <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>2.2</version>
        </dependency>

 以下为工具的代码：若其他小伙伴有更好的实现方式，记得留言小编改进哦，谢谢 

package com.gzu.pyu.tools.utils;

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 javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

/**
 * 条形码和二维码编码解码
 *
 * @author pyu
 * @version 2018-02-28
 */
public class QrCodeUtils {

    /**
     * 条形码编码
     *
     * @param contents 内容,必须为13位阿拉伯数字
     * @param width 宽度
     * @param height 高度
     * @param imgPathName  生成条形码的路径
     * @throws WriterException
     * @throws IOException
     */
    public static void barEncode(String contents, int width, int height, String imgPathName)
            throws WriterException, IOException {

        if (contents!=null&&contents.length()!=13){
            throw new WriterException("the encode contents must be 13 digits");
        }

        int codeWidth = 3 + // start guard
                (7 * 6) + // left bars
                5 + // middle guard
                (7 * 6) + // right bars
                3; // end guard
        codeWidth = Math.max(codeWidth, width);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.EAN_13, codeWidth, height, null);

        MatrixToImageWriter .writeToFile(bitMatrix, "png", new File(imgPathName));
    }

    /**
     * 条形码解码
     *
     * @param imgPathName
     * @return String
     * @exception IOException
     * @exception NotFoundException
     */
    public static String barDecode(String imgPathName)
            throws IOException, NotFoundException {

        BufferedImage image = ImageIO.read(new File(imgPathName));
        if (image == null) {
            throw new IOException("the decode image may be not exit.imgPathName:"+imgPathName);
        }
        LuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Result result = new MultiFormatReader().decode(bitmap, null);
        return result.getText();
    }

    /**
     * 二维码编码
     *
     * @param contents 编码内容
     * @param width 二维码宽度
     * @param height 二维码高度
     * @param imgPathName 生成图片的路径
     */
    public static void qrEncode(String contents, int width, int height, String imgPathName)
            throws WriterException, IOException {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                BarcodeFormat.QR_CODE, width, height, hints);

        MatrixToImageWriter.writeToFile(bitMatrix, "png", new File(imgPathName));
    }

    /**
     * 二维码解码
     *
     * @param imgPathName
     * @return String
     */
    public static String qrDecode(String imgPathName)
            throws NotFoundException, IOException {

        BufferedImage image = ImageIO.read(new File(imgPathName));
        if (image == null) {
            throw new IOException("the decode image may be not exit.imgPathName:"+imgPathName);
        }
        LuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Hashtable<DecodeHintType, Object> hints = new Hashtable<>();
        hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");

        Result result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }

    /**
     * @param args
     */
    public static void main(String[] args)
            throws IOException, WriterException, NotFoundException {

        // 条形码
        String imgPath = "target/pyu_phone_number.png";
        String contents = "86187986139481";
        int width = 105, height = 50;
        QrCodeUtils.barEncode(contents, width, height, imgPath);
        System.out.println("finished pyu_phone_number.png encode.
");

        String decodeContent = QrCodeUtils.barDecode(imgPath);
        System.out.println("barDecode解码内容如下：
" + decodeContent);
        System.out.println("finished zxing EAN-13 decode.
");

        // 二维码
        String imgPath2 = "target/pyu_contact.png";
        StringBuffer buffer=new StringBuffer()
                .append("Hello pyu, welcome to shenzhen!")
                .append("
")
                .append("Blog [ https://www.cnblogs.com/gzu-link-pyu ]")
                .append("
")
                .append("Email [ 1203114557@qq.com ]")
                .append("
");
        int width2 = 300, height2 = 300;
        QrCodeUtils.qrEncode(buffer.toString(), width2, height2, imgPath2);
        System.out.println("finished pyu_contact.png encode.");

        String decodeContent2 = QrCodeUtils.qrDecode(imgPath2);
        System.out.println("qrDecode解码内容如下：
" + decodeContent2);
        System.out.println("finished zxing decode.");

    }
}

运行结果如下：