Java生成中間logo的二維碼的示例代碼
最近有負責微信開發,對于微信開發的項目,肯定少不了二維碼啦,正好有個這樣的需求,這對不同的商品生成一個二維碼,掃碼即刻下單。博主就弄了一個二維碼生成的工具類。
弄出來之后,產品經理又說了,中間放上公司的logo是不是好一點?加上吧,
加上公司logo之后,產品經理想了想,每個商品都有個二維碼,銷售人員有很多個商品二維碼,群發給用戶,在qq群上,微信群上,怎么知道哪個二維碼對應哪個商品的呢?于是決定要加上商品名稱。最后商品二維碼就成了下面這個模樣了(當然啦,這里面的logo并不是博主現職公司的)。
效果已經出來啦,下面附上代碼啦
如果讀者不需要logo或者二維碼名稱的,讀懂代碼后進行刪減即可。注釋多多,還是很容易看懂的。
package com.luo.wctweb.util;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;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;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletRequest;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.lz.lsf.util.Base64;/** * @Description: (二維碼) * @author:luoguohui * @date:2015-10-29 下午05:27:13 */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://www.baidu.com/', null, '跳轉到百度的二維碼'); } catch (Exception e) { e.printStackTrace(); } } /** * 生成帶logo的二維碼圖片 * * @param qrPic * @param logoPic */ public static String getLogoQRCode(String qrUrl,HttpServletRequest request,String productName) {// String filePath = 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 String filePath = 'C:/Users/luoguohui/Desktop/78310a55b319ebc4fa3aef658126cffc1f17168f.jpg'; //TODO 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, new File(filePath), new LogoConfig(), productName); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 給二維碼圖片添加Logo * * @param qrPic * @param logoPic */ 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='data:image/png;base64,${imageBase64QRCode}'/> 其中${imageBase64QRCode}對應二維碼的imageBase64字符串 ImageIO.write(image, 'png', new File('C:/Users/luoguohui/Desktop/TDC-' + new Date().getTime() + 'test.png')); //TODO String imageBase64QRCode = Base64.byteArrayToBase64(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1/5 public 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 #BLACK} and off color * {@link #WHITE}, 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; } }
需要說明的是以上代碼依賴了com.google.zxing這個插件,如果讀者跟博主一樣都是使用maven的話,添加下面依賴即可。如果沒有用maven的話,直接在http://maven.outofmemory.cn/com.google.zxing/core/3.1.0/ 下載。
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.1.0</version></dependency>
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