谷歌二维码google zxing

package com.demo.web.common;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRcodeUtil {
    // 图片宽度的一般
    private static final int IMAGE_WIDTH = 50;
    private static final int IMAGE_HEIGHT = 50;
    private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
    private static final int FRAME_WIDTH = 2;

    // 二维码写码器
    private static MultiFormatWriter mutiWriter = new MultiFormatWriter();

    public static void encode(String content, int width, int height, String srcImagePath, String destImagePath) {
        try {
            ImageIO.write(genBarcode(content, width, height, srcImagePath), "png", new File(destImagePath));
        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }

    private static BufferedImage genBarcode(String content, int width, int height, String srcImagePath)
            throws WriterException, IOException {
        // 读取源图像
        BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH, IMAGE_HEIGHT, true);
        int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
        for (int i = 0; i < scaleImage.getWidth(); i++) {
            for (int j = 0; j < scaleImage.getHeight(); j++) {
                srcPixels[i][j] = scaleImage.getRGB(i, j);
            }
        }

        //设置二维码的纠错级别 编码
        Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
        hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 生成二维码
        BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hint);

        // 二维矩阵转为一维像素数组
        int halfW = matrix.getWidth() / 2;
        int halfH = matrix.getHeight() / 2;
        int[] pixels = new int[width * height];

        for (int y = 0; y < matrix.getHeight(); y++) {
            for (int x = 0; x < matrix.getWidth(); x++) {
                // 读取图片
                if (x > halfW - IMAGE_HALF_WIDTH && x < halfW + IMAGE_HALF_WIDTH && y > halfH - IMAGE_HALF_WIDTH
                        && y < halfH + IMAGE_HALF_WIDTH) {
                    pixels[y * width + x] = srcPixels[x - halfW + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
                }
                // 在图片四周形成边框
                else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH
                                && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH
                                && y < halfH - IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH
                                && y < halfH + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
                    pixels[y * width + x] = 0xfffffff;
                } else {
                    // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                    pixels[y * width + x] = matrix.get(x, y) ? 0xff000000 : 0xfffffff;
                }
            }
        }

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        image.getRaster().setDataElements(0, 0, width, height, pixels);

        return image;
    }

    /**
     * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
     * 
     * @param srcImageFile 源文件地址
     * @param height       目标高度
     * @param width        目标宽度
     * @param hasFiller    比例不对时是否需要补白：true为补白; false为不补白;
     * @throws IOException
     */
    private static BufferedImage scale(String srcImageFile, int height, int width, boolean hasFiller)
            throws IOException {
        double ratio = 0.0; // 缩放比例
        File file = new File(srcImageFile);
        BufferedImage srcImage = ImageIO.read(file);
        Image destImage = srcImage.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
        // 计算比例
        if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
            if (srcImage.getHeight() > srcImage.getWidth()) {
                ratio = (new Integer(height)).doubleValue() / srcImage.getHeight();
            } else {
                ratio = (new Integer(width)).doubleValue() / srcImage.getWidth();
            }
            AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
            destImage = op.filter(srcImage, null);
        }
        if (hasFiller) {// 补白
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D graphic = image.createGraphics();
            graphic.setColor(Color.white);
            graphic.fillRect(0, 0, width, height);
            if (width == destImage.getWidth(null))
                graphic.drawImage(destImage, 0, (height - destImage.getHeight(null)) / 2, destImage.getWidth(null),
                        destImage.getHeight(null), Color.white, null);
            else
                graphic.drawImage(destImage, (width - destImage.getWidth(null)) / 2, 0, destImage.getWidth(null),
                        destImage.getHeight(null), Color.white, null);
            graphic.dispose();
            destImage = image;
        }
        return (BufferedImage) destImage;
    }

    public static void main(String[] args) {
        //将1.png作为logo放在2.png中间   生成扫码图片2.png变成二维码
        QRcodeUtil.encode("http://www.baidu.com", 300, 300, "D:/1.png", "D:/2.png");
        System.out.println("成功！！！");
    }
}