条形码/二维码之开源利器ZXing图文介绍

继前面介绍的一个日本开源软件(该软件只能实现QRCode)原文: Java实现二维码QRCode的编码和解码  ,今发现又一优秀的开源利器-- ZXing,相比而言它更加灵活方便,可以实现多种编码格式。

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:
Java代码 
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 [ [email protected] ]" + "\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:

                               
和前篇介绍一样,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:
Java代码 
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 [ [email protected] ]
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:
Java代码 
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:
Java代码 
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:
6923450657713
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。



转载请注明来自:Michael's blog @ http://sjsky.iteye.com

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