JAVA生成二维码

谁践踏了优雅 2021-09-16 15:22 473阅读 0赞

先引用jar包qrcode，点击[此处][Link 1]下载

# 创建二维码 #

package com.qrcode;
    
    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.UnsupportedEncodingException;
    
    import javax.imageio.ImageIO;
    
    import com.swetake.util.Qrcode;
    
    public class CreateQRCode {
    	public static void main(String[] args) throws IOException {
    		
    		Qrcode x =new Qrcode();
    		
    		x.setQrcodeErrorCorrect('M');//纠错等级
    		x.setQrcodeEncodeMode('B');//N代表数字，A代表a-Z，B代表其他字符
    		x.setQrcodeVersion(7);//版本
    		String qrData="https://blog.csdn.net/qq1515312832";
    		
    		int width=67+12*(7-1);//长宽的值，公式：67+12*(版本号-1)
    		int height=width;
    		
    		BufferedImage bufferedImage=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    		Graphics2D gs=bufferedImage.createGraphics();
    		
    		gs.setBackground(Color.white);
    		gs.setColor(Color.black);
    		gs.clearRect(0, 0, width, height);
    		
    		int pixoff=2;
    		
    		byte[] d=qrData.getBytes("gb2312");
    		if(d.length>0&&d.length<120) {
    			boolean[][]s=x.calQrcode(d);
    			for (int i = 0; i < s.length; i++) {
    				for (int j = 0; j < s.length; j++) {
    					if(s[j][i]) {
    						gs.fillRect(j*3+pixoff,i*3+pixoff,3,3);
    					}					
    				}				
    			}
    		}
    		gs.dispose();
    		bufferedImage.flush();
    		
    		ImageIO.write(bufferedImage, "png", new File("D:/TrainPlan/EclipseWorkspace/imooc_zxing/img1.png"));
    	}
    }

#  读取二维码信息 #

package com.qrcode;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    
    import javax.imageio.ImageIO;
    
    import jp.sourceforge.qrcode.QRCodeDecoder;
    
    public class ReadQRCode {
    	public static void main(String[] args) throws Exception{
    		File file =new File("D:/TrainPlan/EclipseWorkspace/imooc_zxing/img1.png");
    		BufferedImage bufferedImage=ImageIO.read(file);
    		QRCodeDecoder codeDecoder =new QRCodeDecoder();
    		String result = new String(codeDecoder.decode(new MYQRCodeImage(bufferedImage)),"gb2312");
    		System.out.println(result);
    	}
    }

[Link 1]: https://download.csdn.net/download/qq1515312832/10720544