ZXing生成二维码，条码，logo二维码_条形码默认编码-优快云博客

ZXing的使用

准备工作
一、生成普通二维码
- 1.1生成普通二维码
- 1.2低版本包二维码去除白边
二、生成logo二维码
三、生成条形码
测试

准备工作

1.需要依赖zxing的jar包 jar下载，或者maven依赖

<dependency>
   <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.3</version>
</dependency>

2.zXing是开源项目，地址：github
3.通用方法，这个方法是生成普通二维码，并且背景是黑白色

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 java.awt.image.BufferedImage;
/**
 *创建背景色为黑白色的二维码
 * @param url 二维码内容
 * @param charset 二维码内容字符集
 * @param hint  二维码参数设定
 * @param width 二维码宽度
 * @param height 二维码高度
 * @return
 * @author h
 */
public static BufferedImage createQRCode(String url, String charset, Map<EncodeHintType, ?> hint, int width,
                                         int height) {
    BitMatrix matrix;
    try {
        matrix = new MultiFormatWriter().encode(new String(url.getBytes(charset), charset), BarcodeFormat.QR_CODE,
                width, height, hint);
        return toBufferedImage(matrix);
    } catch (WriterException e) {
        throw new RuntimeException(e.getMessage(), e);
    } catch (Exception e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}

/**
 * toBufferedImage
 *修改图片背景色
 * @param matrix
 * @return
 */
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;
}

一、生成普通二维码

1.1生成普通二维码

 /**
 *创建普通二维码,字符为utf-8
 * @param url
 * @return
 * @author h
 */
public static BufferedImage createQRCode(String url) {
	//二维码配置
    Map hint = new HashMap();
    hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//容错级别，共4级，详细百度
    hint.put(EncodeHintType.CHARACTER_SET, QRCODE_CHARSET);//字符集
    hint.put(EncodeHintType.MARGIN, 2);//二维码外边距
    return createQRCode(url, QRCODE_CHARSET, hint, QRCODE_WIDTH, QRCODE_HEIGHT);
}

1.2低版本包二维码去除白边

这里使用3.3，使用键值对EncodeHintType.MARGIN值为0时即可去除白边

/**
* 删除白边,低版本使用
 */
private 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;
}

二、生成logo二维码

/**
* Create qrcode with default settings and logo
 *中间带logo的二维码
 * @param data 二维码内容
 * @param logoFile logo图片路径
 * @return
 * @author h
 */
@SuppressWarnings("unchecked")
public static BufferedImage createQRCodeWithLogo(String data, File logoFile) {
    Map hint = new HashMap();
    hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//容错级别，共4级，详细百度
    hint.put(EncodeHintType.CHARACTER_SET, QRCODE_CHARSET);//字符集编码
    hint.put(EncodeHintType.MARGIN, 0);//二维码外边距
    return createQRCodeWithLogo(data, QRCODE_CHARSET, hint, QRCODE_WIDTH, QRCODE_HEIGHT, logoFile);
}

/**
* Create qrcode with specified hint and logo
  *
  * @param url 二维码内容
  * @param charset 字符集 默认UTF-8
  * @param hint 二维码配置
  * @param width 宽
  * @param height 高
  * @param logoFile logo文件
  * @return
  * @author h
  */
 public static BufferedImage createQRCodeWithLogo(String url, String charset, Map<EncodeHintType, ?> hint,
                                                  int width, int height, File logoFile) {
     try {
         BufferedImage qrcode = createQRCode(url, charset, hint, width, height);
         BufferedImage logo = ImageIO.read(logoFile);

         BufferedImage combined = new BufferedImage(height, width, BufferedImage.TYPE_INT_ARGB);
         Graphics2D g = (Graphics2D) combined.getGraphics();


         //设置二维码大小，太大，会覆盖二维码，此处20%
         int logoWidth = logo.getWidth() > qrcode.getWidth() * 2 / 10 ? (qrcode.getWidth() * 2 / 10) : logo.getWidth();
         int logoHeight = logo.getHeight() > qrcode.getHeight() * 2 / 10 ? (qrcode.getHeight() * 2 / 10) : logo.getHeight();

         //设置logo图片放置位置--中心
         int x = Math.round((qrcode.getWidth() - logoWidth) / 2);
         int y = Math.round((qrcode.getHeight() - logoHeight) / 2);

         g.drawImage(qrcode, 0, 0, null);
         g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));

         //开始合并绘制图片
         g.drawImage(logo, x, y, logoWidth, logoHeight, null);
         g.drawRoundRect(x, y, logoWidth, logoHeight, 15, 15);

         //logo边框大小
         g.setStroke(new BasicStroke(3));
         //logo边框颜色
         g.setColor(Color.white);
         g.drawRoundRect(x, y, logoWidth, logoHeight, 15, 15);
         g.dispose();

         logo.flush();
         qrcode.flush();

         return combined;
     } catch (IOException e) {
         throw new RuntimeException(e.getMessage(), e);
     } catch (Exception e) {
         throw new RuntimeException(e.getMessage(), e);
     }
 }

三、生成条形码

条形码生成是有一定规则的，这里使用的是CODE_128，该条码包括大写字母、数字、常用标点符号和一些控制符。这里给个参考：
条形码使用规则

/**
* 条形码
 *
 * @param contents 内容
 * @param width 宽
 * @param height 高
 * @param imgPath 生成后文件路径
 */
public static void encode(String contents, int width, int height, String imgPath) {
    int codeWidth = 3 + // start guard
            (7 * 6) + // left bars
            + // middle guard
                    (7 * 6) + // right bars
            3; // end guard
    codeWidth = Math.max(codeWidth, width);
    try {
         File file = new File(imgPath);
         BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,BarcodeFormat.CODE_128, codeWidth, height, null);
         MatrixToImageWriter.writeToPath(bitMatrix, "png", file.toPath());
    } catch (Exception e) {
        e.printStackTrace();
    }
}

测试

main方法测试+图片

	//字符集
	public static final String QRCODE_CHARSET = "UTF-8";
	//高度
    public static final int QRCODE_HEIGHT = 300;
	//宽度
    public static final int QRCODE_WIDTH = 300;
	//黑
    private static final int BLACK = 0xFF000000;
    //白
    private static final int WHITE = 0xFFFFFFFF;

    public static void main(String[] args) throws IOException, NotFoundException {
        //生成普通二维码
        BufferedImage qrCode = createQRCode("https://www.baidu.com/");
        ImageIO.write(qrCode, "png", new File("D:/普通二维码.png"));
        //生成logo二维码
        String data = "https://www.baidu.com/";
        File logoFile = new File("D:/1234.png");
        BufferedImage image = QrTest2.createQRCodeWithLogo(data,logoFile);
        ImageIO.write(image, "png", new File("D:/logo二维码.png"));
        //生成条形码
        String imgPath = "D:/条码.png";
        String contents = "6926557300360";
        int width = 400, height = 100;
        encode(contents, width, height, imgPath);

        System.out.println("结束");

    }