JAVA生成二维码

逃离我推掉我的手 2021-06-24 16:09 539阅读 0赞

1.导入google的zxing相关jar包  
2.代码：

import java.awt.BasicStroke;
    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Hashtable;
    
    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;
    
    /**
     * 二维码生成器的类
     * @author 
     * @since 20180430
     *
     */
    public class QRImageUtil {
    	  //私有不可更改的变量：生成二维码图片的颜色
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
        //空的构造方法
        public QRImageUtil() {
        }
        /**
         * 静态方法
         * BufferedImage是Image的一个子类，BufferedImage生成的图片在内存里有一个图像缓冲区，利用这个缓冲区我们可以很方便的操作这个图片，
         * 通常用来做图片修改操作如大小变换、图片变灰、设置图片透明或不透明等。
         * @param matrix 编码形式
         * @return
         */
        public static BufferedImage toBufferedImage(BitMatrix matrix)
        {
                //图片的宽度和高度
                int width = matrix.getWidth();
                int height = matrix.getHeight();
                //BufferedImage.TYPE_INT_RGB将图片变为什么颜色
                BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
                for(int x = 0;x < width;x++)
                {
                        for(int y = 0;y < height;y++)
                        {
                                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
                        }
                }
                return image;
        }
        /** 
         * 设置 logo  
         * @param matrixImage 源二维码图片 
         * @return 返回带有logo的二维码图片 
         * @throws IOException 
         * @author Administrator sangwenhao 
         */  
         public static BufferedImage LogoMatrix(BufferedImage matrixImage) throws IOException{  
             /** 
              * 读取二维码图片，并构建绘图对象 
              */  
             Graphics2D g2 = matrixImage.createGraphics();  
               
             int matrixWidth = matrixImage.getWidth();  
             int matrixHeigh = matrixImage.getHeight();  
               
             /** 
              * 读取Logo图片 
              */  
             BufferedImage logo = ImageIO.read(new File("F:\\logo1.png"));  
      
             //开始绘制图片  
             g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制       
             BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);   
             g2.setStroke(stroke);// 设置笔画对象  
             //指定弧度的圆角矩形  
             RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);  
             g2.setColor(Color.white);  
             g2.draw(round);// 绘制圆弧矩形  
               
             //设置logo 有一道灰色边框  
             BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);   
             g2.setStroke(stroke2);// 设置笔画对象  
             RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);  
             g2.setColor(new Color(128,128,128));  
             g2.draw(round2);// 绘制圆弧矩形  
               
             g2.dispose();  
             matrixImage.flush() ;  
             return matrixImage ;  
         }  
          
        /**
         * 静态方法 用于生成图片
         * @param matrix 编码形式
         * @param format 图片类型
         * @param file 文件（图片路径，图片名称）
         * @throws IOException
         */
        public static void writeToFile(BitMatrix matrix,String format,File file) throws IOException
        {
                BufferedImage image = toBufferedImage(matrix);
                //生成带logo的二维码
                image = LogoMatrix(image);  
                if(!ImageIO.write(image, format, file))
                {
                        throw new IOException("Could not write an image of format " + format + " to " + file);
                }
        }
        /**
         * 输出
         * @param matrix
         * @param format
         * @param stream
         * @throws IOException
         */
        public static void writeToStream(BitMatrix matrix,String format,OutputStream stream) throws IOException
        {
                BufferedImage image = toBufferedImage(matrix);
                //生成带logo的二维码
                image = LogoMatrix(image); 
                if(!ImageIO.write(image, format, stream))
                {
                        throw new IOException("Could not write an image of format " + format);
                }
        }
        
        public static void generateQr(String url) throws Exception{ //二维码中保存的信息
            String content = "http://11.21.22.22/static/apk/app-release.apk";
            //生成的二维码保存的路径
            String path = "E:\\";
            MultiFormatWriter multiFormatWrite = new MultiFormatWriter();
            Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();  
            // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）  
           hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
           // 内容所使用字符集编码  
           hints.put(EncodeHintType.CHARACTER_SET, "utf-8");     
    //     hints.put(EncodeHintType.MAX_SIZE, 350);//设置图片的最大值  
    //     hints.put(EncodeHintType.MIN_SIZE, 100);//设置图片的最小值  
           hints.put(EncodeHintType.MARGIN, 1);//设置二维码边的空度，非负数  
            // 按照指定的宽度，高度和附加参数对字符串进行编码
            //生成二维码
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            BitMatrix bitMatrix = multiFormatWrite.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
            File file1 = new File(path,sdf.format(new Date())+".jpg");
            // 写入文件
            writeToFile(bitMatrix, "jpg", file1);
            System.out.println("二维码图片生成成功！");
        }
        
        public static void main(String[] args) throws Exception {
        	generateQr("lll");
    	}
        
    }