• 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:

    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!"
                    + "
    Michael’s blog [ http://sjsky.iteye.com ]"
                    + "
    EMail [ sjsky007@gmail.com ]" + "
    Twitter [ @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 [ sjsky007@gmail.com ] 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: 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。

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  • 原文地址:https://www.cnblogs.com/lixiaozhe/p/3157458.html
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