java 编写简单二维码demo（亲测可用）

简单生成二维码图片

反正可以用就直接拿过来用了。。

忘了从哪里来了好久前下载的。。

package com.yq1012.二维码;

import java.io.File;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class testQR {

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String text = "http://www.javaweb.top";
        int width = 300;
        int height = 300;
        //二维码的图片格式
        String format = "gif";
        Hashtable hints = new Hashtable();
        //内容所使用编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text,
                BarcodeFormat.QR_CODE, width, height, hints);
        //生成二维码
        File outputFile = new File("d:"+File.separator+"new.gif");
        QRUtil.writeToFile(bitMatrix, format, outputFile);
    }
}

package com.yq1012.二维码;



import com.google.zxing.common.BitMatrix;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.OutputStream;
import java.io.IOException;
import java.awt.image.BufferedImage;

public class QRUtil {

   private static final int BLACK = 0xFF000000;
   private static final int WHITE = 0xFFFFFFFF;

   private QRUtil() {}


   public static BufferedImage toBufferedImage(BitMatrix matrix) {
     int width = matrix.getWidth();
     int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
       }
     }
     return image;
   }


   public static void writeToFile(BitMatrix matrix, String format, File file)
       throws IOException {
     BufferedImage image = toBufferedImage(matrix);
     if (!ImageIO.write(image, format, file)) {
       throw new IOException("Could not write an image of format " + format + " to " + file);
     }
   }


   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
       throws IOException {
     BufferedImage image = toBufferedImage(matrix);
     if (!ImageIO.write(image, format, stream)) {
       throw new IOException("Could not write an image of format " + format);
     }
   }
}

jar 包下载地址 http://www.javaweb.top/lib/core.jar