二维码工具类

import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.WriterException; import com.google.zxing.client.j2se.MatrixToImageWriter; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import sun.font.FontDesignMetrics;

import javax.imageio.ImageIO; import javax.swing.; import java.awt.; import java.awt.image.BufferedImage; import java.io.*; import java.util.HashMap; import java.util.Map;

public class QrCodeUtil { private static final Logger logger = LoggerFactory.getLogger(QrCodeUtil.class);

// logo默认边框颜色
public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
// logo默认边框宽度
public static final int DEFAULT_BORDER = 1;
// logo大小默认为照片的1/6
public static final int DEFAULT_LOGOPART = 6;

private final int border = DEFAULT_BORDER;
private final Color borderColor;
private final int logoPart;

/**
 * Creates a default config with on color  and off color
 *  generating normal black-on-white barcodes.
 * 在颜色{@ link #黑}和颜色上创建一个默认配置
 *  {@link # WHITE}，生成正常的黑白条码。
 */
public QrCodeUtil() {
    this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
}

public QrCodeUtil(Color borderColor, int logoPart) {
    this.borderColor = borderColor;
    this.logoPart = logoPart;
}

public Color getBorderColor() {
    return borderColor;
}

public int getBorder() {
    return border;
}

public int getLogoPart() {
    return logoPart;
}

/**
 * 给二维码图片添加Logo
 *
 * @param qrPic
 * @param logoPic
 */
public static void addLogo_QRCode(File qrPic, File logoPic, QrCodeUtil creatrQrCode) {
    try {
        if (!qrPic.isFile() || !logoPic.isFile()) {
            System.out.print("file not find !");
            System.exit(0);
        }

        /**
         * 读取二维码图片，并构建绘图对象
         */
        BufferedImage image = ImageIO.read(qrPic);
        Graphics2D g = image.createGraphics();

        /**
         * 读取Logo图片
         */
        BufferedImage logo = ImageIO.read(logoPic);

        int widthLogo = image.getWidth() / creatrQrCode.getLogoPart();
        //    int    heightLogo = image.getHeight()/logoConfig.getLogoPart();
        int heightLogo = image.getWidth() / creatrQrCode.getLogoPart(); //保持二维码是正方形的

        // 计算图片放置位置
        int x = (image.getWidth() - widthLogo) / 2;
        int y = (image.getHeight() - heightLogo) / 2;


        //开始绘制图片
        g.drawImage(logo, x, y, widthLogo, heightLogo, null);
        g.drawRoundRect(x, y, widthLogo, heightLogo, 10, 10);
        g.setStroke(new BasicStroke(creatrQrCode.getBorder()));
        g.setColor(creatrQrCode.getBorderColor());
        g.drawRect(x, y, widthLogo, heightLogo);

        g.dispose();

        ImageIO.write(image, "jpeg", new File("D:/ceshi/789.png"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

/**
 * @param pressText 文字
 * @param targetImg 需要添加文字的图片
 * @param fontStyle
 * @param color
 * @param fontSize
 * @param width
 * @param height
 * @为图片添加文字
 */
public static void pressText(String pressText, String targetImg, int fontStyle, Color color, int fontSize, int width, int height) {

    //计算文字开始的位置
    //x开始的位置：（图片宽度-字体大小*字的个数）/2
    int startX = (width - (fontSize * pressText.length())) / 100;
    //y开始的位置：图片高度-（图片高度-图片宽度）/2
    int startY = height - (height - width) / 3;
    Font font = new Font("微软雅黑", fontStyle,fontSize);
    try {
        File file = new File(targetImg);
        Image src = ImageIO.read(file);
        int imageW = src.getWidth(null);
        int imageH = src.getHeight(null);
        BufferedImage image = new BufferedImage(imageW, imageH, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.createGraphics();
        g.drawImage(src, 0, 0, imageW, imageH, null);
        g.setColor(color);
        g.setFont(new Font(null, fontStyle, fontSize));
        String text="扫一扫获取预览效果图";
        int wordWidth = getWordWidth(font, text);
        g.drawString(text,(width-wordWidth)/2,40);
         pressText="人工客服升级了,便捷服务只为您！";

        drawString(g,font,pressText,(width-wordWidth)/2, startY,180);

        g.dispose();

        System.out.println("image press success");
    } catch (Exception e) {
        System.out.println(e);
    }
}

/**
 * @param firstTitle 顶部标题，固定文字
 * @param secoundTitle 底部标题，消息标题
 * @param out  需要添加文字的图片
 * @param fontStyle
 * @param color
 * @param fontSize
 * @param width
 * @param height
 * @为图片添加文字
 */
public static InputStream pressText(String firstTitle, String secoundTitle, ByteArrayOutputStream out,int fontStyle, Color color, int fontSize, int width, int height) throws IOException {
    //计算文字开始的位置
    //x开始的位置：（图片宽度-字体大小*字的个数）/2

// int startX = (width - (fontSize * secoundTitle.length())) / 100; //y开始的位置：图片高度-（图片高度-图片宽度）/2 int startY = height - (height - width) / 3; InputStream input=null; Font font = new Font("微软雅黑", fontStyle,fontSize); ByteArrayInputStream resultInputStream = null; try { input=ConvertUtil.parse(out); input.mark(0); Image src = ImageIO.read(input); int imageW = src.getWidth(null); int imageH = src.getHeight(null); BufferedImage image = new BufferedImage(imageW, imageH, BufferedImage.TYPE_INT_RGB); Graphics g = image.createGraphics(); g.setColor(color); g.setFont(new Font(null, fontStyle, fontSize)); g.drawImage(src, 0, 0, imageW, imageH, null); int wordWidth = getWordWidth(font, firstTitle); g.drawString(firstTitle,(width-wordWidth)/2,40); drawString(g,font,secoundTitle,(width-wordWidth)/2, startY,180); g.dispose(); out=new ByteArrayOutputStream(); ImageIO.write(image, "jpg", out); resultInputStream =ConvertUtil.parse(out); logger.info("image press success"); } catch (Exception e) { logger.info("系统异常,异常信息为:"+e.getMessage()); }finally { if (input!=null){ input.close(); } if(out != null){ out.close(); } } return resultInputStream; }

public static void drawString(Graphics g , Font font , String text , int x , int y , int maxWidth) {

    JLabel label = new JLabel(text);
    label.setFont(font);
    FontMetrics metrics = label.getFontMetrics(label.getFont());
    int textH = metrics.getHeight();
    int textW = metrics.stringWidth(label.getText()); //字符串的宽
    String tempText = text;

    while(textW > maxWidth) {
        int n = textW / maxWidth;
        int subPos = tempText.length() / n;
        String drawText = tempText.substring(0 , subPos);
        int subTxtW = metrics.stringWidth(drawText);
        while(subTxtW > maxWidth) {
            subPos--;
            drawText = tempText.substring(0 , subPos);
            subTxtW = metrics.stringWidth(drawText);
        }
        g.drawString(drawText , x , y);
        y += textH;
        textW = textW - subTxtW;
        tempText = tempText.substring(subPos);
    }

    g.drawString(tempText , x , y);
}
//得到该字体字符串的长度
public static int getWordWidth(Font font, String content) {
    FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
    int width = 0;
    for (int i = 0; i < content.length(); i++) {
        width += metrics.charWidth(content.charAt(i));
    }
    return width;
}
public static InputStream createQrcode(String url) throws Exception {
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    MultiFormatWriter
            multiFormatWriter = new MultiFormatWriter();
    InputStream input=null;
    @SuppressWarnings("rawtypes")
    Map hints = new HashMap();

    //设置UTF-8， 防止中文乱码
    hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    //设置二维码四周白色区域的大小
    hints.put(EncodeHintType.MARGIN,0);
    //设置二维码的容错性
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

    //width:图片完整的宽;height:图片完整的高
    //因为要在二维码下方附上文字，所以把图片设置为长方形（高大于宽）
    int width = 200;
    int height = 300;
    int font = 15; //字体大小
    int fontStyle = 4; //字体风格4
    //画二维码，记得调用multiFormatWriter.encode()时最后要带上hints参数，不然上面设置无效
    BitMatrix bitMatrix = null;
    try {
        bitMatrix = multiFormatWriter.encode(url, BarcodeFormat.QR_CODE, width, height, hints); //开始画二维码
        MatrixToImageWriter.writeToStream(bitMatrix, "jpg", output);
        input=ConvertUtil.parse(output);
       // input= pressText(firstTitle,secoundTitle,output,fontStyle,Color.black,font,width,height);
    } catch (WriterException e) {
        e.printStackTrace();
        logger.info("系统异常,异常信息为:"+e.getMessage());
    } catch (IOException e) {
        e.printStackTrace();
        logger.info("系统异常,异常信息为:"+e.getMessage());
    }
   return input;
}

}