00042-java 生成qrCode

参数类：

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 
 */
public class QRCodeParams {
	private String txt; // 二维码内容
	private String qrCodeUrl; // 二维码网络路径
	private String logoPath; // logo图片
	private Integer width = 300; // 二维码宽度
	private Integer height = 300; // 二维码高度
	private Integer onColor = 0xFF000000; // 前景色
	private Integer offColor = 0xFFFFFFFF; // 背景色
	private Integer margin = 1; // 白边大小，取值范围0~4
	private ErrorCorrectionLevel level = ErrorCorrectionLevel.L; // 二维码容错率

	public String getTxt() {
		return txt;
	}

	public void setTxt(String txt) {
		this.txt = txt;
	}

	public Integer getWidth() {
		return width;
	}

	public void setWidth(Integer width) {
		this.width = width;
	}

	public Integer getHeight() {
		return height;
	}

	public void setHeight(Integer height) {
		this.height = height;
	}

	public String getQrCodeUrl() {
		return qrCodeUrl;
	}

	public void setQrCodeUrl(String qrCodeUrl) {
		this.qrCodeUrl = qrCodeUrl;
	}

	public String getLogoPath() {
		return logoPath;
	}

	public void setLogoPath(String logoPath) {
		this.logoPath = logoPath;
	}

	public Integer getOnColor() {
		return onColor;
	}

	public void setOnColor(Integer onColor) {
		this.onColor = onColor;
	}

	public Integer getOffColor() {
		return offColor;
	}

	public void setOffColor(Integer offColor) {
		this.offColor = offColor;
	}

	public ErrorCorrectionLevel getLevel() {
		return level;
	}

	public void setLevel(ErrorCorrectionLevel level) {
		this.level = level;
	}

	public Integer getMargin() {
		return margin;
	}

	public void setMargin(Integer margin) {
		this.margin = margin;
	}
}

图标配置类：

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

import javax.imageio.ImageIO;
/**

 */
public class QRLogoConfig {
	/**
	 * 设置 logo
	 * 
	 * @param matrixImage
	 *            源二维码图片
	 * @return 返回带有logo的二维码图片
	 * @throws IOException
	 * @author Administrator sangwenhao
	 */
	public BufferedImage LogoMatrix(BufferedImage matrixImage, String logoPath)
			throws IOException {
		/**
		 * 读取二维码图片，并构建绘图对象
		 */
		Graphics2D g2 = matrixImage.createGraphics();

		int matrixWidth = matrixImage.getWidth();
		int matrixHeigh = matrixImage.getHeight();

		int num = logoPath.indexOf('/', 8);
		String u = logoPath.substring(0, num);
		URL url = new URL(logoPath);
		URLConnection connection = url.openConnection();
		connection.setDoOutput(true);
		connection.setRequestProperty("referer", u);
		/**
		 * 读取Logo图片
		 */
		BufferedImage logo = ImageIO.read(connection.getInputStream());

		// 开始绘制图片
		g2.drawImage(logo, matrixWidth / 5 * 2, matrixHeigh / 5 * 2,
				matrixWidth / 5, matrixHeigh / 5, null);// 绘制
		BasicStroke stroke = new BasicStroke(5, BasicStroke.CAP_ROUND,
				BasicStroke.JOIN_ROUND);
		g2.setStroke(stroke);// 设置笔画对象
		// 指定弧度的圆角矩形
		RoundRectangle2D.Float round = new RoundRectangle2D.Float(
				matrixWidth / 5 * 2, matrixHeigh / 5 * 2, matrixWidth / 5,
				matrixHeigh / 5, 20, 20);
		g2.setColor(Color.white);
		g2.draw(round);// 绘制圆弧矩形

		// 设置logo 有一道灰色边框
		BasicStroke stroke2 = new BasicStroke(1, BasicStroke.CAP_ROUND,
				BasicStroke.JOIN_ROUND);
		g2.setStroke(stroke2);// 设置笔画对象
		RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(
				matrixWidth / 5 * 2 + 2, matrixHeigh / 5 * 2 + 2,
				matrixWidth / 5 - 4, matrixHeigh / 5 - 4, 20, 20);
		g2.setColor(new Color(128, 128, 128));
		g2.draw(round2);// 绘制圆弧矩形

		g2.dispose();
		matrixImage.flush();
		return matrixImage;
	}
}

异常类：

/**
 * 

 */
public class QRParamsException extends Exception {
	private static final long serialVersionUID = 8837582301762730656L;

	public QRParamsException() {
	} // 用来创建无参数对象

	public QRParamsException(String message) { // 用来创建指定参数对象
		super(message); // 调用超类构造器
	}
}

工具处理类：

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import org.apache.commons.lang3.StringUtils;

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

/**
 * 

 */
public class QRCodeUtil {
	private static int width = 500; // 二维码宽度
	private static int height = 500; // 二维码高度
	private static int onColor = 0xFF000000; // 前景色
	private static int offColor = 0xFFFFFFFF; // 背景色
	private static int margin = 1; // 白边大小，取值范围0~4
	private static ErrorCorrectionLevel level = ErrorCorrectionLevel.L; // 二维码容错率

	/**
	 * 生成二维码
	 * 
	 * @param params
	 *            QRCodeParams属性：txt、fileName、filePath不得为空；
	 * @throws QRParamsException
	 */
	public static ByteArrayOutputStream generateQRImage(QRCodeParams params)
			throws QRParamsException {
		if (params == null || params.getTxt() == null) {
			throw new QRParamsException("参数错误");
		}
		try {
			initData(params);
			String txt = params.getTxt();
			if (StringUtils.isNoneBlank(params.getLogoPath())) {
				return generateQRImage(txt, params.getLogoPath());
			} else {
				return generateQRImage(txt);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 生成二维码
	 * 
	 * @param txt
	 *            //二维码内容
	 */
	public static ByteArrayOutputStream generateQRImage(String txt) {
		Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
		// 指定纠错等级
		hints.put(EncodeHintType.ERROR_CORRECTION, level);
		// 指定编码格式
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		hints.put(EncodeHintType.MARGIN, margin);
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(txt,
					BarcodeFormat.QR_CODE, width, height, hints);
			BufferedImage image = toBufferedImage(bitMatrix);
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			try {
				ImageIO.write(image, "PNG", out);
				return out;
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 生成带logo的二维码图片
	 * 
	 * @param txt
	 *            //二维码内容
	 * @param logoPath
	 *            //logo绝对物理路径
	 * @throws Exception
	 */
	public static ByteArrayOutputStream generateQRImage(String txt,
			String logoPath) throws Exception {
		Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
		// 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		hints.put(EncodeHintType.ERROR_CORRECTION, level);
		hints.put(EncodeHintType.MARGIN, margin);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(txt,
				BarcodeFormat.QR_CODE, width, height, hints);
		return writeToFile(bitMatrix, logoPath);
	}

	/**
	 * 
	 * @param matrix
	 *            二维码矩阵相关
	 * @param format
	 *            二维码图片格式
	 * @param file
	 *            二维码图片文件
	 * @param logoPath
	 *            logo路径
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, File file,
			String logoPath) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		Graphics2D gs = image.createGraphics();

		int ratioWidth = image.getWidth() * 2 / 10;
		int ratioHeight = image.getHeight() * 2 / 10;
		// 载入logo
		Image img = ImageIO.read(new File(logoPath));
		int logoWidth = img.getWidth(null) > ratioWidth ? ratioWidth : img
				.getWidth(null);
		int logoHeight = img.getHeight(null) > ratioHeight ? ratioHeight : img
				.getHeight(null);

		int x = (image.getWidth() - logoWidth) / 2;
		int y = (image.getHeight() - logoHeight) / 2;

		gs.drawImage(img, x, y, logoWidth, logoHeight, null);
		gs.setColor(Color.black);
		gs.setBackground(Color.WHITE);
		gs.dispose();
		img.flush();
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format "
					+ format + " to " + file);
		}
	}

	public static ByteArrayOutputStream writeToFile(BitMatrix matrix,
			String logoPath) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		// 设置logo图标
		QRLogoConfig logoConfig = new QRLogoConfig();
		image = logoConfig.LogoMatrix(image, logoPath);

		ByteArrayOutputStream out = new ByteArrayOutputStream();
		try {
			ImageIO.write(image, "PNG", out);
			return out;
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	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) ? onColor : offColor);
			}
		}
		return image;
	}

	public static BitMatrix deleteWhite(BitMatrix matrix) {
		int[] rec = matrix.getEnclosingRectangle();
		int resWidth = rec[2] + 1;
		int resHeight = rec[3] + 1;

		BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
		resMatrix.clear();
		for (int i = 0; i < resWidth; i++) {
			for (int j = 0; j < resHeight; j++) {
				if (matrix.get(i + rec[0], j + rec[1]))
					resMatrix.set(i, j);
			}
		}
		return resMatrix;
	}

	private static void initData(QRCodeParams params) {
		if (params.getWidth() != null) {
			width = params.getWidth();
		}
		if (params.getHeight() != null) {
			height = params.getHeight();
		}
		if (params.getOnColor() != null) {
			onColor = params.getOnColor();
		}
		if (params.getOffColor() != null) {
			offColor = params.getOffColor();
		}
		if (params.getLevel() != null) {
			level = params.getLevel();
		}
	}
}

调用：

QRCodeParams qrParams = new QRCodeParams();
//            url = "http://192.168.1.2:8086/business";
            qrParams.setTxt(url);
            qrParams.setWidth(300);
            qrParams.setHeight(300);
            ByteArrayOutputStream out = QRCodeUtil.generateQRImage(qrParams);
            qrCode = this.uploadService.upload(out,IdUtils.id()+".png");