java ZXing生成二维码及条码实例分享
发布时间:2020-12-14 14:37:45 所属栏目:Java 来源:网络整理
导读: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 package com.webos.util;import java
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 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,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,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,height,matrix); return matrix; } public boolean isCropSupported() { return true; } public LuminanceSource crop(int left,int height) { return new BufferedImageLuminanceSource(image,this.left + left,this.top + top,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,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,sourceWidth - (left + width),getHeight(),width); } } QRCodeUtil.java 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,hints); int width = bitMatrix.getWidth(); int height = bitMatrix.getHeight(); BufferedImage image = new BufferedImage(width,BufferedImage.TYPE_INT_RGB); for (int x = 0; x < width; x++) { for (int y = 0; y < height; y++) { image.setRGB(x,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,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,Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(width,BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image,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,null); Shape shape = new RoundRectangle2D.Float(x,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 destPath,boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content,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,OutputStream output,needCompress); ImageIO.write(image,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,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 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,IOException { // TODO Auto-generated method stub doGet(request,response); 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