条形码/二维码之开源利器ZXing图文介绍

全文目录：

• 基本介绍
• 二维码（比如：QRCode）的编码和解码演示
• 条形码（比如：EAN-13）的编码和解码演示

【一】、 基本介绍 ：

1-1. ZXing是一个开源Java类库用于解析多种格式的条形码和二维码.

官网：http://code.google.com/p/zxing/

截止目前为止最新版本为1.7，提供以下编码格式的支持：

• UPC-A and UPC-E
• EAN-8 and EAN-13
• Code 39
• Code 93
• Code 128
• QR Code
• ITF
• Codabar
• RSS-14 (all variants)
• Data Matrix
• PDF 417 ('alpha' quality)
• Aztec ('alpha' quality)

同时官网提供了 Android、cpp、C#、iPhone、j2me、j2se、jruby、objc、rim、symbian等多种应用的类库，具体详情可以参考下载的源码包中。

1-2. 本文和之前的那篇文章一样，主要是在PC上实现条形码（EAN-13）和二维码（QRCode） 的编码和解码的示例，以供大家参考，用到了源码中core和javase下面的相关源代码，附件提供自己编译之后的lib包：

• zxing.jar
• zxing-j2se.jar

有关各种手机系统的应用，有兴趣的朋友可以下载官方源码包，包下有具体详细的应用介绍。

【二】、 二维码（QRCode）的编码和解码演示：

2-1. 编码示例：

package michael.zxing;

import java.io.File;
import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ZxingEncoderHandler {

    /**
     * 编码
     * @param contents
     * @param width
     * @param height
     * @param imgPath
     */
    public void encode(String contents, int width, int height, String imgPath) {
        Hashtable<Object, Object> hints = new Hashtable<Object, Object>();
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "GBK");
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.QR_CODE, width, height, hints);

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

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        String imgPath = "d:/test/twocode/michael_zxing.png";
        String contents = "Hello Michael(大大),welcome to Zxing!"
                + "\nMichael’s blog [ http://sjsky.iteye.com ]"
                + "\nEMail [ [e-mail] ]" + "\nTwitter [ @suncto ]";
        int width = 300, height = 300;
        ZxingEncoderHandler handler = new ZxingEncoderHandler();
        handler.encode(contents, width, height, imgPath);

        System.out.println("Michael ,you have finished zxing encode.");
    }
}

运行后生成的二维码图片如下：

用手机的二维码扫描软件（本人用的：android 快拍二维码 ）来测试下，识别成功的截图如下：

2-2. 解码示例：

package michael.zxing;

import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

/**
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ZxingDecoderHandler {

    /**
     * @param imgPath
     * @return String
     */
    public String decode(String imgPath) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(new File(imgPath));
            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));

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

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

    /**
     * @param args
     */
    public static void main(String[] args) {
        String imgPath = "d:/test/twocode/michael_zxing.png";
        ZxingDecoderHandler handler = new ZxingDecoderHandler();
        String decodeContent = handler.decode(imgPath);
        System.out.println("解码内容如下：");
        System.out.println(decodeContent);
        System.out.println("Michael ,you have finished zxing decode.");

    }
}

运行结果如下：

解码内容如下： Hello Michael(大大),welcome to Zxing! Michael’s blog [ http://sjsky.iteye.com ] EMail [ [e-mail] ] Twitter [ @suncto ]  Michael ,you have finished zxing decode.

从测试结果可见：解码出的内容和之前编码的内容是一致

【三】、 条形码（EAN-13）的编码和解码演示：

3-1. 编码示例：

package michael.zxing;

import java.io.File;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

/**
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ZxingEAN13EncoderHandler {

    /**
     * 编码
     * @param contents
     * @param width
     * @param height
     * @param imgPath
     */
    public void encode(String contents, int width, int height, String imgPath) {
        int codeWidth = 3 + // start guard
                (7 * 6) + // left bars
                5 + // middle guard
                (7 * 6) + // right bars
                3; // end guard
        codeWidth = Math.max(codeWidth, width);
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.EAN_13, codeWidth, height, null);

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

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        String imgPath = "d:/test/twocode/zxing_EAN13.png";
        // 益达无糖口香糖的条形码
        String contents = "6923450657713";

        int width = 105, height = 50;
        ZxingEAN13EncoderHandler handler = new ZxingEAN13EncoderHandler();
        handler.encode(contents, width, height, imgPath);

        System.out.println("Michael ,you have finished zxing EAN13 encode.");
    }
}

6 923450 657713 对应的是益达无糖口香糖：

运行后生成的条形码图片如下：

用手机的扫描软件，识别成功的截图如下：

3-2. 解码示例：

package michael.zxing;

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

/**
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ZxingEAN13DecoderHandler {

    /**
     * @param imgPath
     * @return String
     */
    public String decode(String imgPath) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(new File(imgPath));
            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));

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

    /**
     * @param args
     */
    public static void main(String[] args) {
        String imgPath = "d:/test/twocode/zxing_EAN13.png";
        ZxingEAN13DecoderHandler handler = new ZxingEAN13DecoderHandler();
        String decodeContent = handler.decode(imgPath);
        System.out.println("解码内容如下：");
        System.out.println(decodeContent);
        System.out.println("Michael ,you have finished zxing EAN-13 decode.");

    }
}

运行结果如下：

写道

解码内容如下：   Michael ,you have finished zxing decode.

从测试结果可见：解码出的内容和之前编码的内容是一致。