看到一篇:条形码+二维码,编码解码的文章
转自:http://sjsky.iteye.com/blog/1142177
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 (http://sjsky.iteye.com/blog/1136934 ),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:
【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:
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!" + "\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:
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:
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:
从测试结果可见:解码出的内容和之前编码的内容是一致。