java二维码生成

/** *  */package com.spg.test;/** * 项目名称：weixinpay *  * @description:二维码生成<br> * 注意生成二维码和解析过程中的编码必须为GBK，否则解析过程会出错。 *  * @author spg *  * @create_time：2014年5月20日 上午11:26:27 *  * @version V1.0.0 *  */import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.HashMap;import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.BinaryBitmap;import com.google.zxing.DecodeHintType;import com.google.zxing.EncodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.Result;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;public class QRCodeUtil{/** * 二维码宽高度默认200 */private static final int DEFAULT_IMAGE_WIDTH = 300;private static final int DEFAULT_IMAGE_HEIGHT = 300;/** * 生成带图片二维码时内部图片大小 */private static final int INNER_IMAGE_WIDTH = 60;private static final int INNER_IMAGE_HEIGHT = 60;private static final int IMAGE_HALF_WIDTH = INNER_IMAGE_WIDTH / 2;private static final int FRAME_WIDTH = 2;/** * 生成普通二维码 *  * @param contents 内容 * @param width 二维码宽度，如果小于0，则按默认大小生成 * @param height 二维码高度，如果小于0，则按默认大小生成 * @param imgPath 生成后的文件完整存放路径，包含文件名。形如D:\aa.jpg */public static void encodePR(String contents, int width, int height,String imgPath){Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, 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");if (width <= 0 || height <= 0){width = DEFAULT_IMAGE_WIDTH;height = DEFAULT_IMAGE_HEIGHT;}try{BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,BarcodeFormat.QR_CODE, width, height, hints);MatrixToImageWriter.writeToStream(bitMatrix, "jpg",new FileOutputStream(imgPath));} catch (Exception e){e.printStackTrace();}}/** * 生成带图片的二维码 *  * @param content * @param width * @param height * @param srcImagePath * @param destImagePath */public static void encodePR(String content, int width, int height,String srcImagePath, String destImagePath){try{ImageIO.write(genBarcode(content, width, height, srcImagePath),"jpg", new File(destImagePath));} catch (IOException e){e.printStackTrace();} catch (WriterException e){e.printStackTrace();}}/** * 针对二维码进行解析 *  * @param imgPath 二维码文件路径 * @return */public static String decodePR(String imgPath){BufferedImage image = null;Result result = null;try{image = ImageIO.read(new File(imgPath));if (image == null){throw new RuntimeException("the decode image may be not exists.");}LuminanceSource source = new BufferedImageLuminanceSource(image);BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, "GBK");result = new MultiFormatReader().decode(bitmap, hints);return result.getText();} catch (Exception e){e.printStackTrace();}return null;}/** * 创建条形码 *  * @param contents * @param width * @param height * @param imgPath */public static void encodeBar(String contents, int width, int height,String imgPath){// 条形码的最小宽度int codeWidth = 98;codeWidth = Math.max(codeWidth, width);try{BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,BarcodeFormat.EAN_13, codeWidth, height, null);MatrixToImageWriter.writeToStream(bitMatrix, "png",new FileOutputStream(imgPath));} catch (Exception e){e.printStackTrace();}}/** * 针对条形码进行解析 *  * @param imgPath * @return */public static String decodeBar(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;}/** * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标 *  * @param srcImageFile *            源文件地址 * @param height *            目标高度 * @param width *            目标宽度 * @param hasFiller *            比例不对时是否需要补白：true为补白; false为不补白; * @throws IOException */private static BufferedImage scale(String srcImageFile, int height,int width, boolean hasFiller) throws IOException{double ratio = 0.0; // 缩放比例File file = new File(srcImageFile);BufferedImage srcImage = ImageIO.read(file);Image destImage = srcImage.getScaledInstance(width, height,BufferedImage.SCALE_SMOOTH);// 计算比例if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)){if (srcImage.getHeight() > srcImage.getWidth()){ratio = (new Integer(height)).doubleValue()/ srcImage.getHeight();} else{ratio = (new Integer(width)).doubleValue()/ srcImage.getWidth();}AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);destImage = op.filter(srcImage, null);}if (hasFiller){// 补白BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D graphic = image.createGraphics();graphic.setColor(Color.white);graphic.fillRect(0, 0, width, height);if (width == destImage.getWidth(null))graphic.drawImage(destImage, 0,(height - destImage.getHeight(null)) / 2,destImage.getWidth(null), destImage.getHeight(null),Color.white, null);elsegraphic.drawImage(destImage,(width - destImage.getWidth(null)) / 2, 0,destImage.getWidth(null), destImage.getHeight(null),Color.white, null);graphic.dispose();destImage = image;}return (BufferedImage) destImage;}/** * 产生带有图片的二维码缓冲图像 *  * @param content * @param width * @param height * @param srcImagePath * @return * @throws WriterException * @throws IOException */private static BufferedImage genBarcode(String content, int width,int height, String srcImagePath) throws WriterException,IOException{// 读取源图像BufferedImage scaleImage = scale(srcImagePath, INNER_IMAGE_WIDTH,INNER_IMAGE_HEIGHT, true);int[][] srcPixels = new int[INNER_IMAGE_WIDTH][INNER_IMAGE_HEIGHT];for (int i = 0; i < scaleImage.getWidth(); i++){for (int j = 0; j < scaleImage.getHeight(); j++){srcPixels[i][j] = scaleImage.getRGB(i, j);}}Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();hint.put(EncodeHintType.CHARACTER_SET, "GBK");hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 生成二维码MultiFormatWriter mutiWriter = new MultiFormatWriter();BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,width, height, hint);// 二维矩阵转为一维像素数组int halfW = matrix.getWidth() / 2;int halfH = matrix.getHeight() / 2;int[] pixels = new int[width * height];for (int y = 0; y < matrix.getHeight(); y++){for (int x = 0; x < matrix.getWidth(); x++){// 读取图片if (x > halfW - IMAGE_HALF_WIDTH&& x < halfW + IMAGE_HALF_WIDTH&& y > halfH - IMAGE_HALF_WIDTH&& y < halfH + IMAGE_HALF_WIDTH){pixels[y * width + x] = srcPixels[x - halfW+ IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];}// 在图片四周形成边框else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH&& x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH+ IMAGE_HALF_WIDTH + FRAME_WIDTH)|| (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH+ IMAGE_HALF_WIDTH + FRAME_WIDTH)|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH- IMAGE_HALF_WIDTH + FRAME_WIDTH)|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH&& y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH+ IMAGE_HALF_WIDTH + FRAME_WIDTH)){pixels[y * width + x] = 0xfffffff;} else{// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；pixels[y * width + x] = matrix.get(x, y) ? 0xff000000: 0xfffffff;}}}BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);image.getRaster().setDataElements(0, 0, width, height, pixels);return image;}public static void main(String[] args){String imgPath = "d:/pr1.jpg";String contents = "你好,李四! welcome to zxing!"+ "\n李四的博客[http://my.oschina.net/cloudcoder]"+ "\nEmail[[e-mail]]";// 普通二维码的生成与解析QRCodeUtil.encodePR(contents, 0, 10, imgPath);System.out.println("生成二维码成功");System.out.println(QRCodeUtil.decodePR(imgPath)); // 带图片的二维的生成与解析 imgPath = "d:/pr2.png"; String srcPath = "d:/src.jpg"; QRCodeUtil.encodePR(contents, 300, 300, srcPath, imgPath); System.out.println("生成带图片的二维码成功"); System.out.println(QRCodeUtil.decodePR(imgPath)); // 条形码的生成与解析 imgPath = "d:/bar.png"; QRCodeUtil.encodeBar("6923450657713", 105, 50, imgPath); System.out.println("生成条形码成功"); System.out.println(QRCodeUtil.decodeBar(imgPath));}}

注意：如果使用JDK1.7版本，jar包的maven库为：

<dependency>            <groupId>com.google.zxing</groupId>            <artifactId>javase</artifactId>            <version>3.0.1</version>        </dependency>

但是如果使用JDK1.6一下版本编译，用以上jar包会报错，改用2.2版本jar包可解决。

zxing2.2.jar下载地址：http://download.csdn.net/detail/fengspg/7378425