ZXing生成二维码

转自搜到的帖子

代码如下：

package crunchify.com.tutorial;
 
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.EnumMap;
import java.util.Map;
 
import javax.imageio.ImageIO;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
/**
 * @author Crunchify.com
 * Updated: 03/20/2016 - added code to narrow border size 
 */
 
public class CrunchifyQRCode {
 
    // Tutorial: http://zxing.github.io/zxing/apidocs/index.html
 
    public static void main(String[] args) {
        String myCodeText = "http://crunchify.com/";
        String filePath = "/Users/appshah/Documents/CrunchifyQR.png";
        int size = 250;
        String fileType = "png";
        File myFile = new File(filePath);
        try {
            
            Map<EncodeHintType, Object> hintMap = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
            hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            
            // Now with zxing version 3.2.1 you could change border size (white border size to just 1)
            hintMap.put(EncodeHintType.MARGIN, 1); /* default = 4 */
            hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
 
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix byteMatrix = qrCodeWriter.encode(myCodeText, BarcodeFormat.QR_CODE, size,
                    size, hintMap);
            int CrunchifyWidth = byteMatrix.getWidth();
            BufferedImage image = new BufferedImage(CrunchifyWidth, CrunchifyWidth,
                    BufferedImage.TYPE_INT_RGB);
            image.createGraphics();
 
            Graphics2D graphics = (Graphics2D) image.getGraphics();
            graphics.setColor(Color.WHITE);
            graphics.fillRect(0, 0, CrunchifyWidth, CrunchifyWidth);
            graphics.setColor(Color.BLACK);
 
            for (int i = 0; i < CrunchifyWidth; i++) {
                for (int j = 0; j < CrunchifyWidth; j++) {
                    if (byteMatrix.get(i, j)) {
                        graphics.fillRect(i, j, 1, 1);
                    }
                }
            }
            ImageIO.write(image, fileType, myFile);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("

You have successfully created QR Code.");
    }
}

有问题欢迎讨论：http://www.cnblogs.com/tomcatandjerry