zxing二维码的使用

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背景

  在项目中，使用到了二维码。开始是让前台的同事做，不过她们说logo不好做。所以改为了后台生成图片。

zxing

  有google提供的开源的库

代码实现

引入依赖

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.3.1</version>
</dependency>
<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>javase</artifactId>
	<version>3.3.1</version>
</dependency>

工具类

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
import javax.imageio.ImageIO;

/**
 * 二维码工具类
 */
public class QRCodeUtil {

  private static final String CHARSET = "utf-8";

  private static final String FORMAT_NAME = "JPG";

  // 二维码尺寸
  private static final int QRCODE_SIZE = 300;

  // LOGO宽度
  private static final int WIDTH = 60;

  // LOGO高度
  private static final int HEIGHT = 60;

  public static BufferedImage createImage(String content) throws Exception {
    return createImage(content, null, false);
  }

  /**
   * 生成二维码的方法
   *
   * @param content 目标URL
   * @param imgPath LOGO图片地址
   * @param needCompress 是否压缩LOGO
   * @return 二维码图片
   */
  public static BufferedImage createImage(String content, String imgPath,
      boolean needCompress) throws Exception {
    Hashtable hints = new Hashtable();
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
    hints.put(EncodeHintType.MARGIN, 1);
    BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
        BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
    int width = bitMatrix.getWidth();
    int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000
            : 0xFFFFFFFF);
      }
    }
    if (imgPath == null || "".equals(imgPath)) {
      return image;
    }
    // 插入图片
    QRCodeUtil.insertImage(image, imgPath, needCompress);
    return image;
  }


  /**
   * 插入LOGO
   *
   * @param source 二维码图片
   * @param imgPath LOGO图片地址
   * @param needCompress 是否压缩
   */
  private static void insertImage(BufferedImage source, String imgPath,
      boolean needCompress) throws Exception {
    File file = new File(imgPath);
    if (!file.exists()) {
      System.err.println("" + imgPath + "   该文件不存在！");
      return;
    }
    Image src = ImageIO.read(new File(imgPath));
    int width = src.getWidth(null);
    int height = src.getHeight(null);
    if (needCompress) { // 压缩LOGO
      if (width > WIDTH) {
        width = WIDTH;
      }
      if (height > HEIGHT) {
        height = HEIGHT;
      }
      Image image = src.getScaledInstance(width, height,
          Image.SCALE_SMOOTH);
      BufferedImage tag = new BufferedImage(width, height,
          BufferedImage.TYPE_INT_RGB);
      Graphics g = tag.getGraphics();
      g.drawImage(image, 0, 0, null); // 绘制缩小后的图
      g.dispose();
      src = image;
    }
    // 插入LOGO
    Graphics2D graph = source.createGraphics();
    int x = (QRCODE_SIZE - width) / 2;
    int y = (QRCODE_SIZE - height) / 2;
    graph.drawImage(src, x, y, width, height, null);
    Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
    graph.setStroke(new BasicStroke(3f));
    graph.draw(shape);
    graph.dispose();
  }

  /**
   * 生成二维码(内嵌LOGO)
   *
   * @param content 内容
   * @param imgPath LOGO地址
   * @param destPath 存放目录
   * @param needCompress 是否压缩LOGO
   */
  public static void encode(String content, String imgPath, String destPath,
      boolean needCompress) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
    mkdirs(destPath);
    String file = new Random().nextInt(99999999) + ".jpg";
    ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
  }

  /**
   * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
   *
   * @param destPath 存放目录
   */
  public static void mkdirs(String destPath) {
    File file = new File(destPath);
    if (!file.exists() && !file.isDirectory()) {
      file.mkdirs();
    }
  }

  /**
   * 生成二维码(内嵌LOGO)
   *
   * @param content 内容
   * @param imgPath LOGO地址
   * @param destPath 存储地址
   */
  public static void encode(String content, String imgPath, String destPath)
      throws Exception {
    QRCodeUtil.encode(content, imgPath, destPath, false);
  }

  /**
   * 生成二维码
   *
   * @param content 内容
   * @param destPath 存储地址
   * @param needCompress 是否压缩LOGO
   */
  public static void encode(String content, String destPath,
      boolean needCompress) throws Exception {
    QRCodeUtil.encode(content, null, destPath, needCompress);
  }

  /**
   * 生成二维码
   *
   * @param content 内容
   * @param destPath 存储地址
   */
  public static void encode(String content, String destPath) throws Exception {
    QRCodeUtil.encode(content, null, destPath, false);
  }

  /**
   * 生成二维码(内嵌LOGO)
   *
   * @param content 内容
   * @param imgPath LOGO地址
   * @param output 输出流
   * @param needCompress 是否压缩LOGO
   */
  public static void encode(String content, String imgPath,
      OutputStream output, boolean needCompress) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content, imgPath,
        needCompress);
    ImageIO.write(image, FORMAT_NAME, output);
  }

  /**
   * 生成二维码
   *
   * @param content 内容
   * @param output 输出流
   */
  public static void encode(String content, OutputStream output)
      throws Exception {
    QRCodeUtil.encode(content, null, output, false);
  }

  /**
   * 解析二维码
   *
   * @param file 二维码图片
   */
  public static String decode(File file) throws Exception {
    BufferedImage image;
    image = ImageIO.read(file);
    if (image == null) {
      return null;
    }
    BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
        image);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    Result result;
    Hashtable hints = new Hashtable();
    hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
    result = new MultiFormatReader().decode(bitmap, hints);
    String resultStr = result.getText();
    return resultStr;
  }

  /**
   * 解析二维码
   *
   * @param path 二维码图片地址
   * @return 不是二维码的内容返回null, 是二维码直接返回识别的结果
   */
  public static String decode(String path) throws Exception {
    return QRCodeUtil.decode(new File(path));
  }

  public static void main(String[] args) {

    // 生成二维码
    String text = "https://www.baidu.com/";
    //String imagePath = System.getProperty("user.dir") + "/data/1.jpg";
    String imagePath = null;
    String destPath = System.getProperty("user.dir") + "/data/output/";
    try {
      QRCodeUtil.encode(text, imagePath, destPath, true);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //验证图片是否含有二维码
/*    String destPath1 = System.getProperty("user.dir") + "/data/3.jpg";
    try {
      String result = decode(destPath1);
      System.out.println(result);
    } catch (Exception e) {
      e.printStackTrace();
      System.out.println(destPath1 + "不是二维码");
    }*/
  }

}

controller层

	@RequestMapping("/qrcode")
	public void qrcode(OutputStream response) throws Exception {
		QRCodeUtil.encode("https://chnsys-law.com", "C:\\Users\\yyb\\Desktop\\123.jpg", response, true);
	}

或

@RequestMapping("/qrcode1")
	public void qrcode(HttpServletResponse response) throws Exception {
		BufferedImage bufferedImage = QRCodeUtil.createImage("https://chnsys-law.com", "C:\\Users\\yyb\\Desktop\\123.jpg",true);
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		// 将二进制数据写入ByteArrayOutputStream
		ImageIO.write(bufferedImage, "jpg", baos);
		response.setCharacterEncoding("UTF-8");
		response.setContentType("image/jpeg;charset=UTF-8");
		response.setContentLength(baos.size());
		ServletOutputStream outputStream = response.getOutputStream();
		outputStream.write(baos.toByteArray());
		outputStream.flush();
		outputStream.close();
	}

访问

至此，完成了使用zxing生成二维码。大家可以扫一下，点击一下我们的平台。有意见或建议可以在评论中提出。