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[转]java二维码生成与解析代码实现
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二維碼，是一種采用黑白相間的平面幾何圖形通過相應的編碼算法來記錄文字、圖片、網址等信息的條碼圖片。如下圖
二維碼的特點：
1.? 高密度編碼，信息容量大
可容納多達1850個大寫字母或2710個數字或1108個字節，或500多個漢字，比普通條碼信息容量約高幾十倍。
2.? 編碼范圍廣
該條碼可以把圖片、聲音、文字、簽字、指紋等可以數字化的信息進行編碼，用條碼表示出來；可以表示多種語言文字；可表示圖像數據。
3.? 容錯能力強，具有糾錯功能
這使得二維條碼因穿孔、污損等引起局部損壞時，照樣可以正確得到識讀，損毀面積達50%仍可恢復信息。
4.? 譯碼可靠性高
它比普通條碼譯碼錯誤率百萬分之二要低得多，誤碼率不超過千萬分之一。
5.? 可引入加密措施
保密性、防偽性好。
6.? 成本低，易制作，持久耐用
正因為以上這些特點，二維碼現在越來越流行，應用也是越來越廣（詳細了解請見百度百科，介紹不是本篇重點），所以掌握如何開發二維碼是非常不錯的知識儲備，因此本篇博文將為大家講解如何生成、解析二維碼。
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所需jar包：QRCode.jar
http://download.csdn.net/detail/wangpeng047/4008532
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TwoDimensionCode類：二維碼操作核心類
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[java]?view plaincopy
package?qrcode;????import?java.awt.Color;??import?java.awt.Graphics2D;??import?java.awt.image.BufferedImage;??import?java.io.File;??import?java.io.IOException;??import?java.io.InputStream;??import?java.io.OutputStream;????import?javax.imageio.ImageIO;????import?jp.sourceforge.qrcode.QRCodeDecoder;??import?jp.sourceforge.qrcode.exception.DecodingFailedException;????import?com.swetake.util.Qrcode;????public?class?TwoDimensionCode?{????????????????public?void?encoderQRCode(String?content,?String?imgPath)?{??????????this.encoderQRCode(content,?imgPath,?"png",?7);??????}????????????????public?void?encoderQRCode(String?content,?OutputStream?output)?{??????????this.encoderQRCode(content,?output,?"png",?7);??????}????????????????public?void?encoderQRCode(String?content,?String?imgPath,?String?imgType)?{??????????this.encoderQRCode(content,?imgPath,?imgType,?7);??????}????????????????public?void?encoderQRCode(String?content,?OutputStream?output,?String?imgType)?{??????????this.encoderQRCode(content,?output,?imgType,?7);??????}????????????public?void?encoderQRCode(String?content,?String?imgPath,?String?imgType,?int?size)?{??????????try?{??????????????BufferedImage?bufImg?=?this.qRCodeCommon(content,?imgType,?size);????????????????????????????File?imgFile?=?new?File(imgPath);??????????????????????????ImageIO.write(bufImg,?imgType,?imgFile);??????????}?catch?(Exception?e)?{??????????????e.printStackTrace();??????????}??????}????????????public?void?encoderQRCode(String?content,?OutputStream?output,?String?imgType,?int?size)?{??????????try?{??????????????BufferedImage?bufImg?=?this.qRCodeCommon(content,?imgType,?size);??????????????????????????ImageIO.write(bufImg,?imgType,?output);??????????}?catch?(Exception?e)?{??????????????e.printStackTrace();??????????}??????}????????????????private?BufferedImage?qRCodeCommon(String?content,?String?imgType,?int?size)?{??????????BufferedImage?bufImg?=?null;??????????try?{??????????????Qrcode?qrcodeHandler?=?new?Qrcode();??????????????????????????qrcodeHandler.setQrcodeErrorCorrect('M');??????????????qrcodeHandler.setQrcodeEncodeMode('B');??????????????????????????qrcodeHandler.setQrcodeVersion(size);??????????????????????????byte[]?contentBytes?=?content.getBytes("utf-8");??????????????????????????int?imgSize?=?67?+?12?*?(size?-?1);??????????????bufImg?=?new?BufferedImage(imgSize,?imgSize,?BufferedImage.TYPE_INT_RGB);??????????????Graphics2D?gs?=?bufImg.createGraphics();??????????????????????????gs.setBackground(Color.WHITE);??????????????gs.clearRect(0,?0,?imgSize,?imgSize);????????????????????????????gs.setColor(Color.BLACK);??????????????????????????int?pixoff?=?2;??????????????????????????if?(contentBytes.length?>?0?&&?contentBytes.length?<?800)?{??????????????????boolean[][]?codeOut?=?qrcodeHandler.calQrcode(contentBytes);??????????????????for?(int?i?=?0;?i?<?codeOut.length;?i++)?{??????????????????????for?(int?j?=?0;?j?<?codeOut.length;?j++)?{??????????????????????????if?(codeOut[j][i])?{??????????????????????????????gs.fillRect(j?*?3?+?pixoff,?i?*?3?+?pixoff,?3,?3);??????????????????????????}??????????????????????}??????????????????}??????????????}?else?{??????????????????throw?new?Exception("QRCode?content?bytes?length?=?"?+?contentBytes.length?+?"?not?in?[0,?800].");??????????????}??????????????gs.dispose();??????????????bufImg.flush();??????????}?catch?(Exception?e)?{??????????????e.printStackTrace();??????????}??????????return?bufImg;??????}????????????????public?String?decoderQRCode(String?imgPath)?{??????????????????File?imageFile?=?new?File(imgPath);??????????BufferedImage?bufImg?=?null;??????????String?content?=?null;??????????try?{??????????????bufImg?=?ImageIO.read(imageFile);??????????????QRCodeDecoder?decoder?=?new?QRCodeDecoder();??????????????content?=?new?String(decoder.decode(new?TwoDimensionCodeImage(bufImg)),?"utf-8");???????????}?catch?(IOException?e)?{??????????????System.out.println("Error:?"?+?e.getMessage());??????????????e.printStackTrace();??????????}?catch?(DecodingFailedException?dfe)?{??????????????System.out.println("Error:?"?+?dfe.getMessage());??????????????dfe.printStackTrace();??????????}??????????return?content;??????}????????????????public?String?decoderQRCode(InputStream?input)?{??????????BufferedImage?bufImg?=?null;??????????String?content?=?null;??????????try?{??????????????bufImg?=?ImageIO.read(input);??????????????QRCodeDecoder?decoder?=?new?QRCodeDecoder();??????????????content?=?new?String(decoder.decode(new?TwoDimensionCodeImage(bufImg)),?"utf-8");???????????}?catch?(IOException?e)?{??????????????System.out.println("Error:?"?+?e.getMessage());??????????????e.printStackTrace();??????????}?catch?(DecodingFailedException?dfe)?{??????????????System.out.println("Error:?"?+?dfe.getMessage());??????????????dfe.printStackTrace();??????????}??????????return?content;??????}????????public?static?void?main(String[]?args)?{??????????String?imgPath?=?"G:/TDDOWNLOAD/Michael_QRCode.png";??????????String?encoderContent?=?"Hello?大大、小小,welcome?to?QRCode!"?+?"\nMyblog?[?http://sjsky.iteye.com?]"?+?"\nEMail?[?sjsky007@gmail.com?]";??????????TwoDimensionCode?handler?=?new?TwoDimensionCode();??????????handler.encoderQRCode(encoderContent,?imgPath,?"png");??????????System.out.println("========encoder?success");??????????????????????????????String?decoderContent?=?handler.decoderQRCode(imgPath);??????????System.out.println("解析結果如下：");??????????System.out.println(decoderContent);??????????System.out.println("========decoder?success!!!");??????}??}??
TwoDimensionCodeImage?類：二維碼圖片對象
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[java]?view plaincopy
package?qrcode;????import?java.awt.image.BufferedImage;????import?jp.sourceforge.qrcode.data.QRCodeImage;????public?class?TwoDimensionCodeImage?implements?QRCodeImage?{????????BufferedImage?bufImg;????????????public?TwoDimensionCodeImage(BufferedImage?bufImg)?{??????????this.bufImg?=?bufImg;??????}????????????@Override??????public?int?getHeight()?{??????????return?bufImg.getHeight();??????}????????@Override??????public?int?getPixel(int?x,?int?y)?{??????????return?bufImg.getRGB(x,?y);??????}????????@Override??????public?int?getWidth()?{??????????return?bufImg.getWidth();??????}????}??
上面的java代碼，筆者已經進行了簡單的封裝，方便大家適用不同場合，希望對大家能有所幫助。
轉載于:https://www.cnblogs.com/gangben/p/4387584.html
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