Java二维码工具类(使用zxing实现，可支持logo)

本工具类基于Google二维码框架zxing3.1.0实现。

1. pom.xml中依赖包设置

<dependency>        <groupId>com.google.zxing</groupId>        <artifactId>core</artifactId>        <version>3.1.0</version>    </dependency>    <dependency>        <groupId>com.google.zxing</groupId>        <artifactId>javase</artifactId>        <version>3.1.0</version>    </dependency>

2. 二维码工具类

import java.awt.BasicStroke;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Shape;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.OutputStream;import java.util.Hashtable;import java.util.Random;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.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.Result;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/** * 二维码工具类 *  */public class QRCodeUtil {private static final String CHARSET = "utf-8";private static final String FORMAT = "JPG";// 二维码尺寸private static final int QRCODE_SIZE = 300;// LOGO宽度private static final int LOGO_WIDTH = 60;// LOGO高度private static final int LOGO_HEIGHT = 60;private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);hints.put(EncodeHintType.CHARACTER_SET, CHARSET);hints.put(EncodeHintType.MARGIN, 1);BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,hints);int width = bitMatrix.getWidth();int height = bitMatrix.getHeight();BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);for (int x = 0; x < width; x++) {for (int y = 0; y < height; y++) {image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);}}if (logoPath == null || "".equals(logoPath)) {return image;}// 插入图片QRCodeUtil.insertImage(image, logoPath, needCompress);return image;}/** * 插入LOGO *  * @param source *            二维码图片 * @param logoPath *            LOGO图片地址 * @param needCompress *            是否压缩 * @throws Exception */private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {File file = new File(logoPath);if (!file.exists()) {throw new Exception("logo file not found.");}Image src = ImageIO.read(new File(logoPath));int width = src.getWidth(null);int height = src.getHeight(null);if (needCompress) { // 压缩LOGOif (width > LOGO_WIDTH) {width = LOGO_WIDTH;}if (height > LOGO_HEIGHT) {height = LOGO_HEIGHT;}Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(image, 0, 0, null); // 绘制缩小后的图g.dispose();src = image;}// 插入LOGOGraphics2D graph = source.createGraphics();int x = (QRCODE_SIZE - width) / 2;int y = (QRCODE_SIZE - height) / 2;graph.drawImage(src, x, y, width, height, null);Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);graph.setStroke(new BasicStroke(3f));graph.draw(shape);graph.dispose();}/** * 生成二维码(内嵌LOGO) * 二维码文件名随机，文件名可能会有重复 *  * @param content *            内容 * @param logoPath *            LOGO地址 * @param destPath *            存放目录 * @param needCompress *            是否压缩LOGO * @throws Exception */public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);mkdirs(destPath);String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));return fileName;}/** * 生成二维码(内嵌LOGO) * 调用者指定二维码文件名 *  * @param content *            内容 * @param logoPath *            LOGO地址 * @param destPath *            存放目录 * @param fileName *            二维码文件名 * @param needCompress *            是否压缩LOGO * @throws Exception */public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);mkdirs(destPath);fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length()) + "." + FORMAT.toLowerCase();ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));return fileName;}/** * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir． * (mkdir如果父目录不存在则会抛出异常) * @param destPath *            存放目录 */public static void mkdirs(String destPath) {File file = new File(destPath);if (!file.exists() && !file.isDirectory()) {file.mkdirs();}}/** * 生成二维码(内嵌LOGO) *  * @param content *            内容 * @param logoPath *            LOGO地址 * @param destPath *            存储地址 * @throws Exception */public static String encode(String content, String logoPath, String destPath) throws Exception {return QRCodeUtil.encode(content, logoPath, destPath, false);}/** * 生成二维码 *  * @param content *            内容 * @param destPath *            存储地址 * @param needCompress *            是否压缩LOGO * @throws Exception */public static String encode(String content, String destPath, boolean needCompress) throws Exception {return QRCodeUtil.encode(content, null, destPath, needCompress);}/** * 生成二维码 *  * @param content *            内容 * @param destPath *            存储地址 * @throws Exception */public static String encode(String content, String destPath) throws Exception {return QRCodeUtil.encode(content, null, destPath, false);}/** * 生成二维码(内嵌LOGO) *  * @param content *            内容 * @param logoPath *            LOGO地址 * @param output *            输出流 * @param needCompress *            是否压缩LOGO * @throws Exception */public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);ImageIO.write(image, FORMAT, output);}/** * 生成二维码 *  * @param content *            内容 * @param output *            输出流 * @throws Exception */public static void encode(String content, OutputStream output) throws Exception {QRCodeUtil.encode(content, null, output, false);}/** * 解析二维码 *  * @param file *            二维码图片 * @return * @throws Exception */public static String decode(File file) throws Exception {BufferedImage image;image = ImageIO.read(file);if (image == null) {return null;}BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));Result result;Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, CHARSET);result = new MultiFormatReader().decode(bitmap, hints);String resultStr = result.getText();return resultStr;}/** * 解析二维码 *  * @param path *            二维码图片地址 * @return * @throws Exception */public static String decode(String path) throws Exception {return QRCodeUtil.decode(new File(path));}public static void main(String[] args) throws Exception {String text = "http://www.baidu.com";//不含Logo//QRCodeUtil.encode(text, null, "e:\\", true);//含Logo，不指定二维码图片名//QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", true);//含Logo，指定二维码图片名QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", "qrcode", true);}}

参考资料:
1. http://blog.csdn.net/mmm333zzz/article/details/17259513
2. http://kesun-shy.iteye.com/blog/2154169