Java生成二维码连接
本文使用的是Goodge的zxing
添加maven依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency>
测试类
import com.qxgf.medical.util.EncodeImgZingLogo; import java.io.File; /** * @ClassName EncodeImgZingLogoTest * @Author Mr.Tang * @Date 2019/7/31 12:27 * @Version 1.0 **/ public class EncodeImgZingLogoTest { public static void main(String[] args) { String contents = "http://blog.csdn.net/typa01_kk"; String format = "jpeg"; //***此处如果格式为"gif",则logo图片为黑色,其他格式ok //生成二维码 File logoImg = new File("C:\\Users\\Administrator\\Desktop\\qxgf1.png"); File img = new File("D:"+File.separator+"csdn.jpg"); EncodeImgZxing.writeToFile(contents, format, img); // //添加logo图片 File img1 = new File("D:"+File.separator+"csdnlogo.jpg"); EncodeImgZingLogo.writeToFile(img, logoImg, format, img1); } }
实现类
import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.util.EnumMap; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; /** * 通过google的zxing实现二维码(加入logo图片) * */ public final class EncodeImgZxing { //二维码颜色 private static final int BLACK = 0xFF000000;//0xFFFF0000,红色 //二维码背景色 private static final int WHITE = 0xFFFFFFFF;//0xFF0000FF,蓝色 //注:二维码颜色色差大,扫描快,但如果"BLACK'设置为黑色外其他颜色,可能无法扫描 //二维码图片宽度 private static final int width = 300; //二维码图片高度 private static final int height = 300; //二维码格式参数 private static final EnumMap<EncodeHintType, Object> hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class); static{ /*二维码的纠错级别(排错率),4个级别: L (7%)、 M (15%)、 Q (25%)、 H (30%)(最高H) 纠错信息同样存储在二维码中,纠错级别越高,纠错信息占用的空间越多,那么能存储的有用讯息就越少;共有四级; 选择M,扫描速度快。 */ hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 二维码边界空白大小 1,2,3,4 (4为默认,最大) hints.put(EncodeHintType.MARGIN, 1); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); hints.put(EncodeHintType.MAX_SIZE, 350); hints.put(EncodeHintType.MIN_SIZE, 150); } /** * 绘制二维码 * @param contents 二维码内容 * @return image 二维码图片 * */ public static BufferedImage encodeImg(String contents){ BufferedImage image = null; try{ BitMatrix matrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints); image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); int width = matrix.getWidth(); int height = matrix.getHeight(); for(int x = 0; x < width; x++){ for(int y =0;y < height; y++){ image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); } } }catch(Exception e){ System.out.println("生成二维码失败"+e.getMessage()); } return image; } /** * 二维码输出到文件 * @param contents 二维码内容 * @param format 图片格式 * @param file 输出文件 * */ public static void writeToFile(String contents,String format,File file){ BufferedImage image = encodeImg(contents); try { ImageIO.write(image, format, file); } catch (IOException e) { System.out.println("二维码写入文件失败"+e.getMessage()); } } /** * 二维码流式输出 * @param contents 二维码内容 * @param format 图片格式 * @param stream 输出流 * */ public static void writeToStream(String contents,String format,OutputStream stream){ BufferedImage image = encodeImg(contents); try { ImageIO.write(image, format, stream); } catch (IOException e) { System.out.println("二维码写入流失败"+e.getMessage()); } } }
加入自定义logo实现类
import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.OutputStream; import javax.imageio.ImageIO; /** * 通过google的zxing实现二维码(加入logo图片) * */ public final class EncodeImgZingLogo { /** * 二维码绘制logo * @param twodimensioncodeImg 二维码图片文件 * @param logoImg logo图片文件 * */ public static BufferedImage encodeImgLogo(File twodimensioncodeImg,File logoImg){ BufferedImage twodimensioncode = null; try{ if(!twodimensioncodeImg.isFile() || !logoImg.isFile()){ System.out.println("输入非图片"); return null; } //读取二维码图片 twodimensioncode = ImageIO.read(twodimensioncodeImg); //获取画笔 Graphics2D g = twodimensioncode.createGraphics(); //读取logo图片 BufferedImage logo = ImageIO.read(logoImg); //设置二维码大小,太大,会覆盖二维码,此处20% int logoWidth = logo.getWidth(null) > twodimensioncode.getWidth()*3 /10 ? (twodimensioncode.getWidth()*3 /10) : logo.getWidth(null); int logoHeight = logo.getHeight(null) > twodimensioncode.getHeight()*2 /10 ? (twodimensioncode.getHeight()*2 /10) : logo.getHeight(null); //设置logo图片放置位置 //中心 int x = (twodimensioncode.getWidth() - logoWidth) / 2; int y = (twodimensioncode.getHeight() - logoHeight) / 2; //右下角,15为调整值 // int x = twodimensioncode.getWidth() - logoWidth-15; // int y = twodimensioncode.getHeight() - logoHeight-15; //开始合并绘制图片 g.drawImage(logo, x, y, logoWidth, logoHeight, null); g.drawRoundRect(x, y, logoWidth, logoHeight, 15 ,15); //logo边框大小 g.setStroke(new BasicStroke(2)); //logo边框颜色 g.setColor(Color.WHITE); g.drawRect(x, y, logoWidth, logoHeight); g.dispose(); logo.flush(); twodimensioncode.flush(); }catch(Exception e){ System.out.println("二维码绘制logo失败"); } return twodimensioncode; } /** * 二维码输出到文件 * @param twodimensioncodeImg 二维码图片文件 * @param logoImg logo图片文件 * @param format 图片格式 * @param file 输出文件 * */ public static void writeToFile(File twodimensioncodeImg,File logoImg,String format,File file){ BufferedImage image = encodeImgLogo(twodimensioncodeImg, logoImg); try { ImageIO.write(image, format, file); } catch (IOException e) { System.out.println("二维码写入文件失败"+e.getMessage()); } } /** * 二维码流式输出 * @param twodimensioncodeImg 二维码图片文件 * @param logoImg logo图片文件 * @param format 图片格式 * @param stream 输出流 * */ public static void writeToStream(File twodimensioncodeImg,File logoImg,String format,OutputStream stream){ BufferedImage image = encodeImgLogo(twodimensioncodeImg, logoImg); try { ImageIO.write(image, format, stream); } catch (IOException e) { System.out.println("二维码写入流失败"+e.getMessage()); } } }
效果图: