【QR Code】二维码编码：基于第三方库：swetake

地址：http://www.swetake.com/qr/java/qr_java.html

1、下载

解压缩，添加swetake/lib/Qrcode.jar

2、使用

API文档：http://www.swetake.com/qr/java/docs/index.html

代码示例：

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class QRCodeEncoder {
    
    public static byte[] createQRCode(String content) {
        byte[] result = null;
        try {
            Qrcode qrcodeHandler = new Qrcode();
            qrcodeHandler.setQrcodeErrorCorrect('M');
            qrcodeHandler.setQrcodeEncodeMode('B');
            qrcodeHandler.setQrcodeVersion(7);
            
            byte[] contentBytes = content.getBytes("utf-8");

            BufferedImage bufferImgage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
            
            Graphics2D graphics2D = bufferImgage.createGraphics();
            graphics2D.setBackground(Color.WHITE);
            graphics2D.clearRect(0, 0, 200, 200);
            graphics2D.setColor(Color.BLACK);
            int pixoff = 10;
            if (contentBytes.length > 0 && contentBytes.length < 120) {
                boolean[][] matrix = qrcodeHandler.calQrcode(contentBytes);
                for (int i = 0; i < matrix.length; i++) {
                    for (int j = 0; j < matrix.length; j++) {
                        if (matrix[j][i]) {
                            graphics2D.fillRect(j * 4 + pixoff, i * 4 + pixoff, 4, 4);
                        }
                    }
                }
            } else {
                //
            }
            graphics2D.dispose();

            bufferImgage.flush();

            ByteArrayOutputStream output = new ByteArrayOutputStream();
            ImageIO.write(bufferImgage, "png", output);
            result = output.toByteArray();
            output.close();
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return result;
    }
}

转载于:https://www.cnblogs.com/dyingbleed/archive/2013/01/18/2865902.html