Java基于zxing生成二维码demo

QR码属于矩阵式二维码中的一个种类，由DENSO(日本电装)公司开发，由JIS和ISO将其标准化。QR码的样子其实在很多场合已经能够被看到了，我这还是贴个图展示一下：

这个图如果被正确解码，应该看到百度。

具体的也不说什么了，百度一大把，直接上源码~

package com.lincoln.Untils;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;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;import java.util.Hashtable;public class QRUtil {    private static final int BLACK = 0xFF000000;    private static final int WHITE = 0xFFFFFFFF;    /**     * @param args     * @throws Exception     */    public static void main(String[] args) throws Exception {        String text = "http://www.baidu.com";        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("/Users/lizhi/Downloads" + File.separator + "new.gif");        QRUtil.writeToFile(bitMatrix, format, outputFile);    }    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);        }    }}

恩，就这么简单。