生成二维码工具类及使用
工具类：
package com.guoqidangjian.chat.service.service.impl; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import com.guoqidangjian.chat.contract.service.QRcodeService; import org.apache.commons.lang3.StringUtils; import org.springframework.stereotype.Service; import javax.imageio.ImageIO; import java.awt.*; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Map; /** * Created by SunZhenYang on 2015/10/16. */ @Service("qRcodeService") public class QRcodeServiceImpl implements QRcodeService { // 图片宽度的一般 private static final int IMAGE_WIDTH = 80; private static final int IMAGE_HEIGHT = 80; private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2; private static final int FRAME_WIDTH = 2; // 二维码写码器 private static MultiFormatWriter mutiWriter = new MultiFormatWriter(); @Override public String getQRcodeUrl(String content,int width, int height, String srcImagePath, String destImagePath) { return encode( content, width, height, srcImagePath, destImagePath); } private String encode(String content, int width, int height, String srcImagePath, String destImagePath) { try { if(!StringUtils.isBlank(srcImagePath)){ ImageIO.write(genBarcode(content, width, height, srcImagePath), "jpg", new File(destImagePath)); }else{ ImageIO.write(genBarcode(content, width, height), "jpg", new File(destImagePath)); } } catch (IOException e) { e.printStackTrace(); } catch (WriterException e) { e.printStackTrace(); } return destImagePath; } private static BufferedImage genBarcode(String content, int width, int height, String srcImagePath) throws WriterException, IOException { // 读取源图像 BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH, IMAGE_HEIGHT, true); int[][] srcPixels = new int[IMAGE_WIDTH][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, "utf-8"); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 生成二维码 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; } private static BufferedImage genBarcode(String content, int width, int height) throws WriterException, IOException { Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>(); hint.put(EncodeHintType.CHARACTER_SET, "utf-8"); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 生成二维码 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++) { // 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; } /** * 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); else graphic.drawImage(destImage, (width - destImage.getWidth(null)) / 2, 0, destImage.getWidth(null), destImage.getHeight(null), Color.white, null); graphic.dispose(); destImage = image; } return (BufferedImage) destImage; } }
调用接口：
package com.guoqidangjian.chat.contract.service; /** * Created by SunZhenYang on 2015/10/16. */ public interface QRcodeService { /** * 获取二维码图片，支持生成二维码中加入图片 * * @param content 二维码中包含的内容 * @param width 图片的宽度 * @param height 图片高度 * @param srcImagePath 需要插入的图片地址,没有可以为空 * @param destImagePath 生成的二维码路径 * @return */ String getQRcodeUrl(String content,int width, int height, String srcImagePath, String destImagePath); }
controller 调用方法代码：
/** * 生成二维码 * @param id * @param title * @param content * @param meetDate 会议时间 * @param request * @param model * @return */ @RequestMapping(value="/threeLesson/getQRcodeurl",method=RequestMethod.GET) public String getQRcodeurl(String id,String meetDate,HttpServletRequest request,HttpServletResponse response, ModelMap model) throws UnsupportedEncodingException{ request.setCharacterEncoding("gb2312"); response.setContentType("text/html;charset=utf-8"); String title = request.getParameter("title"); title= new String(request.getParameter("title").getBytes("ISO-8859-1"),"utf-8"); String qRcontent="{\"id\" : "+id+", \"title\" : "+title+", \"meetDate\" : "+meetDate+"}"; //简单的时间戳 Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); String str = sdf.format(date); String temporaryPath= System.getProperty("java.io.tmpdir"); temporaryPath=temporaryPath+str; String qRcodeUrl=qRcodeService.getQRcodeUrl(qRcontent,300, 300, "", temporaryPath); model.addAttribute("qRcodeUrl",qRcodeUrl); return "threeLesson/RQcode"; }
