最近剛好在做一個基于二維碼的電子優惠券，便弄了一個生成Logo的二維碼工具類。

package com.left.QrCode;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 org.apache.commons.codec.binary.Base64;import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.File; import java.util.Date; import java.util.HashMap; import java.util.Map;/*** @Description: (二維碼)*/ public class ZXingCode {private static final int QRCOLOR = 0xFF000000; //默認是黑色private static final int BGWHITE = 0xFFFFFFFF; //背景顏色public static void main(String[] args) throws WriterException {try {getLogoQRCode("https://blog.csdn.net/weixin_37591536","E:/qrcode/1.png", "跳轉到程程博客的二維碼");} catch (Exception e) {e.printStackTrace();}}/*** 生成帶logo的二維碼圖片** @param qrUrl* @param ,*/public static String getLogoQRCode(String qrUrl, String logUrl,String productName) { // String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";//filePath是二維碼logo的路徑，但是實際中我們是放在項目的某個路徑下面的，所以路徑用上面的，把下面的注釋就好File file = new File(logUrl);String content = qrUrl;try {ZXingCode zp = new ZXingCode();BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());return zp.addLogo_QRCode(bim, file, new LogoConfig(), productName);} catch (Exception e) {e.printStackTrace();}return null;}/*** 給二維碼圖片添加Logo*/public String addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName) {try {/*** 讀取二維碼圖片，并構建繪圖對象*/BufferedImage image = bim;Graphics2D g = image.createGraphics();/*** 讀取Logo圖片*/BufferedImage logo = ImageIO.read(logoPic);/*** 設置logo的大小,本人設置為二維碼圖片的20%,因為過大會蓋掉二維碼*/int widthLogo = logo.getWidth(null) > image.getWidth() * 3 / 10 ? (image.getWidth() * 3 / 10) : logo.getWidth(null),heightLogo = logo.getHeight(null) > image.getHeight() * 3 / 10 ? (image.getHeight() * 3 / 10) : logo.getWidth(null);/*** logo放在中心*/int x = (image.getWidth() - widthLogo) / 2;int y = (image.getHeight() - heightLogo) / 2;/*** logo放在右下角* int x = (image.getWidth() - widthLogo);* int y = (image.getHeight() - heightLogo);*///開始繪制圖片g.drawImage(logo, x, y, widthLogo, heightLogo, null); // g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15); // g.setStroke(new BasicStroke(logoConfig.getBorder())); // g.setColor(logoConfig.getBorderColor()); // g.drawRect(x, y, widthLogo, heightLogo);g.dispose();//把商品名稱添加上去，商品名稱不要太長哦，這里最多支持兩行。太長就會自動截取啦if (productName != null && !productName.equals("")) {//新的圖片，把帶logo的二維碼下面加上文字BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);Graphics2D outg = outImage.createGraphics();//畫二維碼到新的面板outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);//畫文字到新的面板outg.setColor(Color.BLACK);outg.setFont(new Font("宋體", Font.BOLD, 30)); //字體、字型、字號int strWidth = outg.getFontMetrics().stringWidth(productName);if (strWidth > 399) { // //長度過長就截取前面部分 // outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //畫文字//長度過長就換行String productName1 = productName.substring(0, productName.length() / 2);String productName2 = productName.substring(productName.length() / 2, productName.length());int strWidth1 = outg.getFontMetrics().stringWidth(productName1);int strWidth2 = outg.getFontMetrics().stringWidth(productName2);outg.drawString(productName1, 200 - strWidth1 / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12);BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);Graphics2D outg2 = outImage2.createGraphics();outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);outg2.setColor(Color.BLACK);outg2.setFont(new Font("宋體", Font.BOLD, 30)); //字體、字型、字號outg2.drawString(productName2, 200 - strWidth2 / 2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight()) / 2 + 5);outg2.dispose();outImage2.flush();outImage = outImage2;} else {outg.drawString(productName, 200 - strWidth / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12); //畫文字}outg.dispose();outImage.flush();image = outImage;}logo.flush();image.flush();ByteArrayOutputStream baos = new ByteArrayOutputStream();baos.flush();ImageIO.write(image, "png", baos);//二維碼生成的路徑，但是實際項目中，我們是把這生成的二維碼顯示到界面上的，因此下面的折行代碼可以注釋掉//可以看到這個方法最終返回的是這個二維碼的imageBase64字符串//前端用 <img src="https://img-blog.csdnimg.cn/2022010615303214074.png"/> 其中${imageBase64QRCode}對應二維碼的imageBase64字符串ImageIO.write(image, "png", new File("E:/qrcode/" + new Date().getTime() + "test.png")); //TODOString imageBase64QRCode = Base64.encodeBase64URLSafeString(baos.toByteArray());baos.close();return imageBase64QRCode;} catch (Exception e) {e.printStackTrace();}return null;}/*** 構建初始化二維碼** @param bm* @return*/public BufferedImage fileToBufferedImage(BitMatrix bm) {BufferedImage image = null;try {int w = bm.getWidth(), h = bm.getHeight();image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);for (int x = 0; x < w; x++) {for (int y = 0; y < h; y++) {image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);}}} catch (Exception e) {e.printStackTrace();}return image;}/*** 生成二維碼bufferedImage圖片** @param content 編碼內容* @param barcodeFormat 編碼類型* @param width 圖片寬度* @param height 圖片高度* @param hints 設置參數* @return*/public BufferedImage getQR_CODEBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height, Map<EncodeHintType, ?> hints) {MultiFormatWriter multiFormatWriter = null;BitMatrix bm = null;BufferedImage image = null;try {multiFormatWriter = new MultiFormatWriter();// 參數順序分別為：編碼內容，編碼類型，生成圖片寬度，生成圖片高度，設置參數bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);int w = bm.getWidth();int h = bm.getHeight();image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);// 開始利用二維碼數據創建Bitmap圖片，分別設為黑（0xFFFFFFFF）白（0xFF000000）兩色for (int x = 0; x < w; x++) {for (int y = 0; y < h; y++) {image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);}}} catch (WriterException e) {e.printStackTrace();}return image;}/*** 設置二維碼的格式參數** @return*/public Map<EncodeHintType, Object> getDecodeHintType() {// 用于設置QR二維碼參數Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();// 設置QR二維碼的糾錯級別（H為最高級別）具體級別信息hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 設置編碼方式hints.put(EncodeHintType.CHARACTER_SET, "utf-8");hints.put(EncodeHintType.MARGIN, 0);hints.put(EncodeHintType.MAX_SIZE, 350);hints.put(EncodeHintType.MIN_SIZE, 100);return hints;} }class LogoConfig {// logo默認邊框顏色public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;// logo默認邊框寬度public static final int DEFAULT_BORDER = 2;// logo大小默認為照片的1/5public static final int DEFAULT_LOGOPART = 5;private final int border = DEFAULT_BORDER;private final Color borderColor;private final int logoPart;/*** Creates a default config with on color {@link #} and off color* {@link #}, generating normal black-on-white barcodes.*/public LogoConfig() {this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);}public LogoConfig(Color borderColor, int logoPart) {this.borderColor = borderColor;this.logoPart = logoPart;}public Color getBorderColor() {return borderColor;}public int getBorder() {return border;}public int getLogoPart() {return logoPart;} }

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