根据url和图片生成二维码

// 根据uid发现推广链接
    public Msg findtgUrlById(Long uid) {
        String url = CommonConstant.Server_Url + "/index.html#/register?tgUrl=" + userDao
        .findUserInfoById(uid).getPromotionUrl();
        String saveFilePath = CommonConstant.Server_directory;
        // 文件的扩张名
        String extensionName = ".jpg";
        String imgPath = "img/" + uid + extensionName;
        cn.xuzhou.zcf.utils.erwm.BarcodeFactory.encode(url, 300, 300, saveFilePath + "img/" 
        + "money2.jpg", saveFilePath + "img/" + uid + ".jpg");
        Msg msg = new Msg();
        msg.add("url", url);
        msg.add("promotionImg", CommonConstant.Server_Url + "/phoenix/manager/" + imgPath);
        return msg;
    }
    

下面是二维码工具类

package cn.xuzhou.zcf.utils.erwm;

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;

/**
 * @author lichunxi
 * 
 */
public class BarcodeFactory {
	
	public static void main(String[] args) {
		//url放链接
		//第一个f是需要放在二维码中间的图片，f代表f盘
		//第一个f是需要放在生成的图片，f代表f盘
		BarcodeFactory.encode("https://www.baidu.com", 300, 
		300, "f:\\\\mm2.jpg//", "f:\\\\welcome.jpg");
	}


	// 图片宽度的一般
	private static final int IMAGE_WIDTH = 80;
	private static final int IMAGE_HEIGHT = 80;
	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), "jpg", 
			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);
			}
		}

		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;
	}

}