1、jar包： ZXing-core-3.3.0.jar http://mvnrepository.com/artifact/com.google.zxing/core
ZXing-javase-3.3.0.jar http://mvnrepository.com/artifact/com.google.zxing/javase
BufferedImageLuminanceSource.java
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package com.webos.util;import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import com.google.zxing.LuminanceSource;public class BufferedImageLuminanceSource extends LuminanceSource { private final BufferedImage image; private final int left; private final int top; public BufferedImageLuminanceSource(BufferedImage image) { this(image, 0, 0, image.getWidth(), image.getHeight()); } public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) { super(width, height); int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); if (left + width > sourceWidth || top + height > sourceHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); } for (int y = top; y < top + height; y++) { for (int x = left; x < left + width; x++) { if ((image.getRGB(x, y) & 0xFF000000) == 0) { image.setRGB(x, y, 0xFFFFFFFF); // = white } } } this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY); this.image.getGraphics().drawImage(image, 0, 0, null); this.left = left; this.top = top; } public byte[] getRow(int y, byte[] row) { if (y < 0 || y >= getHeight()) { throw new IllegalArgumentException("Requested row is outside the image: " + y); } int width = getWidth(); if (row == null || row.length < width) { row = new byte[width]; } image.getRaster().getDataElements(left, top + y, width, 1, row); return row; } public byte[] getMatrix() { int width = getWidth(); int height = getHeight(); int area = width * height; byte[] matrix = new byte[area]; image.getRaster().getDataElements(left, top, width, height, matrix); return matrix; } public boolean isCropSupported() { return true; } public LuminanceSource crop(int left, int top, int width, int height) { return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); } public boolean isRotateSupported() { return true; } public LuminanceSource rotateCounterClockwise() { int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth); BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY); Graphics2D g = rotatedImage.createGraphics(); g.drawImage(image, transform, null); g.dispose(); int width = getWidth(); return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); }} |
QRCodeUtil.java
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package com.webos.util;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.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/*** @ClassName: QRCodeUtil * @Description: 二维码编码* @author Liuy* @date 2016年7月9日 下午3:03:24 * */public class QRCodeUtil { // 设置二维码编码格式 private static final String CHARSET = "utf-8"; // 保存的二维码格式 private static final String FORMAT_NAME = "JPG"; // 二维码尺寸 private static final int QRCODE_SIZE = 800; // LOGO宽度 private static final int LOGO_WIDTH = 80; // LOGO高度 private static final int LOGO_HEIGHT = 80; /** * @Title: createImage * @Description: 将二维码内容创建到Image流 * @param content 二维码内容 * @param imgPath logo图片地址 * @param needCompress 是否压缩logo图片大小 * @return * @throws Exception 参数说明 * @return BufferedImage 返回类型 * @throws */ 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logo QRCodeUtil.insertImage(image, logoPath, needCompress); return image; } /** * @Title: insertImage * @Description: 将logo插入到二维码中 * @param source 二维码Image流 * @param imgPath logo地址 * @param needCompress 是否压缩大小 * @throws Exception 参数说明 * @return void 返回类型 * @throws */ private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception { File file = new File(logoPath); if (!file.exists()) { System.err.println("" + logoPath + " 该文件不存在！"); return; } 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(); } /** * @Title: mkdirs * @Description: 创建文件夹 * @param destPath 文件夹地址 * @return void 返回类型 * @throws */ private static boolean mkdirs(String destPath) { File file = new File(destPath); // 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) if (!file.exists() && !file.isDirectory()) { file.mkdirs(); return true; } return false; } /** * @Title: encode * @Description: 生成二维码 * @param content 二维码内容 * @param imgPath logo图片地址 * @param destPath 目标保存地址 * @param needCompress 是否压缩logo图片大小 * @throws Exception 参数说明 * @return void 返回类型 * @throws */ private static void encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress); if (mkdirs(destPath)) { String file = new Random().nextInt(99999999) + ".jpg"; ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file)); } } /** * @Title: encode * @Description: 生成二维码 * @param content 二维码内容 * @param destPath 目标保存地址 * @throws Exception 参数说明 * @return void 返回类型 * @throws */ public static void encode(String content, String destPath) throws Exception { QRCodeUtil.encode(content, null, destPath, false); } /** * @Title: encode * @Description: 生成二维码 * @param content 二维码内容 * @param imgPath logo图片地址 * @param output 输出流 * @param needCompress 是否压缩logo图片大小 * @throws Exception 参数说明 * @return void 返回类型 * @throws */ 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_NAME, output); } /** * @Title: encode * @Description: 生成二维码 * @param content 二维码内容 * @param output 输出流 * @throws Exception 参数说明 * @return void 返回类型 * @throws */ public static void encode(String content, OutputStream output) throws Exception { QRCodeUtil.encode(content, null, output, false); } /** * @Title: decode * @Description: 对二维码解码 * @param file 文件对象 * @return 解码后的二维码内容字符串 * @throws Exception 参数说明 * @return String 返回类型 * @throws */ private 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)); Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); return new MultiFormatReader().decode(bitmap, hints).getText(); } /** * @Title: decode * @Description: 对二维码解码 * @param path 文件路径 * @return * @throws Exception 参数说明 * @return String 返回类型 * @throws */ public static String decode(String path) throws Exception { return QRCodeUtil.decode(new File(path)); }} |
QRCodeServlet.java
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package com.webos.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.webos.util.QRCodeUtil;/* * Servlet implementation class QRCodeServlet */@WebServlet("/QRCodeServlet")public class QRCodeServlet extends HttpServlet { private static final long serialVersionUID = 1L; /* * @see HttpServlet#HttpServlet() */ public QRCodeServlet() { super(); } /* * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { String text = "http://www.baidu.com?timestamp=" + System.currentTimeMillis(); QRCodeUtil.encode(text, response.getOutputStream()); } catch (Exception e) { e.printStackTrace(); } } /* * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); }} |
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原文链接：http://www.cnblogs.com/m-liuy/p/6181948.html
