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(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：
- 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 com.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 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, "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 com.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 hints = new Hashtable();
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：
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：
package com.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 com.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：
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。