一、maven引入依赖jar包
com.google.zxing core 3.1.0 com.google.zxing javase 3.1.0
二、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;/** * 二维码生成工具类 * @author Lee * @Date 2018年7月18日 */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 hints = new Hashtable (); 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LOGO if (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LOGO Graphics2D 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 hints = new Hashtable (); 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://localhost:8083/communication/distribution?qrid=54999"; //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:\\error.jpg", "e:\\", "qrcode", true); }}