java二維碼，條碼，【ZXing】

ZXing是一個開源Java類庫用於解析多種格式的條碼和二維碼.

官網：http://code.google.com/p/zxing/

截止目前為止最新版本為1.7，提供以下編碼格式的支援： 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)

同時官網提供了 Android、cpp、C#、iPhone、j2me、j2se、jruby、objc、rim、symbian等多種應用的類庫，具體詳情可以參考下載的源碼包中。

範例程式碼需要使用的jar包ZXing-2.0.zip下面的core.jar,javase.jar。

二維碼編碼，解碼

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 {/** * 編碼 *  * @param contents * @param width * @param height * @param imgPath */public void encode(String contents, int width, int height, String imgPath) {Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();// 指定錯誤修正等級hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);// 指定編碼格式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 = "zxing.png";String contents = "Hello Michael(大大),welcome to Zxing!"+ "\nMichael’s blog [ http://sjsky.iteye.com ]"+ "\nEMail [ sjsky007@gmail.com ]" + "\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.");}}

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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, 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 = "zxing.png";          ZxingDecoderHandler handler = new ZxingDecoderHandler();          String decodeContent = handler.decode(imgPath);          System.out.println("解碼內容如下：");          System.out.println(decodeContent);          System.out.println("Michael ,you have finished zxing decode.");        }  } 

條碼的編碼，解碼

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 {        /**      * 編碼      * @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 = "zxing_EAN13.png";          // 益達無糖口香糖的條碼          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.");      }  }

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 = "zxing_EAN13.png";          ZxingEAN13DecoderHandler handler = new ZxingEAN13DecoderHandler();          String decodeContent = handler.decode(imgPath);          System.out.println("解碼內容如下：");          System.out.println(decodeContent);          System.out.println("Michael ,you have finished zxing EAN-13 decode.");        }  }