使用Java生成二维码 (使用谷歌的zxing)

痛定思痛。 2021-09-28 16:44 312阅读 0赞

# 使用Java生成二维码 (使用谷歌的zxing) #

# 在项目中不断学习。。。。。。。 #

pom.xml导入jar包

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>

package com.ssm.Utils;
    
    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;
    
    import javax.imageio.ImageIO;
    import java.awt.*;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.ByteArrayOutputStream;
    import java.io.File;
    import java.util.Arrays;
    import java.util.Hashtable;
    
    public class QRUtils {
        private static final String CHARSET = "utf-8";
        private static final String FORMAT_NAME = "JPG";
        //二维码的尺寸
        private static final int QRCODE_SIZE = 300;
        private static final int WIDTH = 60;
        private static final int HEIGHT = 60;
    
        public static BufferedImage createImage(String content,String imgPath,boolean needCompress) throws Exception{
            //用于设置QR二维码参数
            Hashtable hints = new Hashtable();
            //设置QR二维码的纠错级别，H为最高级别
            hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.H);
            //设置编码格式
            hints.put(EncodeHintType.CHARACTER_SET,CHARSET);
            //设置二维码空白区域大小
            hints.put(EncodeHintType.MARGIN,1);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE,QRCODE_SIZE,QRCODE_SIZE,hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
    
            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,bitMatrix.get(x,y)? 0xFF000000:0xFFFFFFFF);
                }
            }
            if (imgPath == null || "".equals(imgPath)){
                return image;
            }
            //插入图片
            QRUtils.inserImage(image,imgPath,needCompress);
            return image;
    
        }
    
        private static void inserImage(BufferedImage source,String imgPath,boolean needCompress) throws Exception{
            File file = new File(imgPath);
            if (!file.exists()){
                System.err.println(""+imgPath+" 该文件不存在！");
                return;
            }
            //读取照片，用Image接收
            Image src = ImageIO.read(new File(imgPath));
            //获取照片真是宽度
            int width = src.getWidth(null);
            //获取照片真是高度  如果没加载到img对象就会返回-1
            int height = src.getHeight(null);
            if (needCompress){//压缩logo
                if (width>WIDTH){
                    width = WIDTH;
                }
                if (height>HEIGHT){
                    height = HEIGHT;
                }
                //Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
                Image image = src.getScaledInstance(width,height,Image.SCALE_SMOOTH);
                /*
                    BufferedImage 是Image的一个子类，Image和BufferedImage的主要作用就是将图片加载到内存中，BufferedImage生成的图片在内存里有一个
                  图像的缓冲区，利用这个缓冲区可以很方便操作图片，大小变换，图片变灰，透明不透明
                  BufferedImage img = ImageIO.read(new FileInputStream(path));
                    创建一个不带透明色的BufferedImage对象
                 */
                BufferedImage tag = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
                Graphics g = tag.getGraphics();
                g.drawImage(image,0,0,null);//绘制缩小后的图
                g.dispose();
                src = image;
            }
            //插入logo
            Graphics2D graph = source.createGraphics();
            int x = (QRCODE_SIZE-width)/2;
            int y = (QRCODE_SIZE-height)/2;
            graph.drawImage(src,x,y,width,height,null);
            Shape shape = new RoundRectangle2D.Float(x,y,width,width,6,6);
            graph.setStroke(new BasicStroke(3f));
            graph.draw(shape);
            graph.dispose();
    
        }
    
        //获取生成二维码的图片流
        public static ByteArrayOutputStream encodelIO(String content,String imgPath,Boolean needCompress) throws Exception{
            BufferedImage image = QRUtils.createImage(content,imgPath,needCompress);
            //创建存储图片二进制流的输出流
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            //将二进制数据写入ByteArrayOutputStream
            ImageIO.write(image,"jpg",baos);
            return baos;
        }
    
        public static void main(String[] args) throws Exception {
            String text = "输入自己的URL";
            ByteArrayOutputStream encodeIO = QRUtils.encodelIO(text, "logo图片的路径", true);
            //输入数组
            System.out.println("-------------------------------------");
            System.out.println(Arrays.toString(encodeIO.toByteArray()));
        }
    
    }