java工具类之二维码解析工具类

工具类：

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

/**
 * 二维码解析工具类
 * 
 * @author zql
 *
 */
public class QrCodeDecodeUtil {

	/**
	 * 根据File对象解析二维码
	 * 
	 * @param file
	 * @return 二维码字符串内容
	 * @throws Exception
	 */
	public static String decode(File file) throws Exception {
		// 定义 图片缓存对象
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new QrCodeDecodeUtil().new BufferedImageLuminanceSource(image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Hashtable<DecodeHintType, Object> ht = new Hashtable<DecodeHintType, Object>();
		// 设置解析编码
		ht.put(DecodeHintType.CHARACTER_SET, "UTF-8");
		result = new MultiFormatReader().decode(bitmap, ht);
		return result.getText();
	}
 
	/**
	 * 根据文件路径解析二维码
	 * 
	 * @param filePath 文件路径
	 * @return 二维码字符串内容
	 * @throws Exception
	 */
	public static String decode(String filePath) throws Exception {
		return QrCodeDecodeUtil.decode(new File(filePath));
	}
	
	class BufferedImageLuminanceSource extends LuminanceSource {
		 
		private final BufferedImage image;
		private final int left;
		private final int top;
	 
		public BufferedImageLuminanceSource(BufferedImage image) {
			this(image, 0, 0, image.getWidth(), image.getHeight());
		}
	 
		public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
			super(width, height);
	 
			int sourceWidth = image.getWidth();
			int sourceHeight = image.getHeight();
			if (left + width > sourceWidth || top + height > sourceHeight) {
				throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
			}
	 
			for (int y = top; y < top + height; y++) {
				for (int x = left; x < left + width; x++) {
					if ((image.getRGB(x, y) & 0xFF000000) == 0) {
						image.setRGB(x, y, 0xFFFFFFFF); // = white
					}
				}
			}
	 
			this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
			this.image.getGraphics().drawImage(image, 0, 0, null);
			this.left = left;
			this.top = top;
		}
	 
		public byte[] getRow(int y, byte[] row) {
			if (y < 0 || y >= getHeight()) {
				throw new IllegalArgumentException("Requested row is outside the image: " + y);
			}
			int width = getWidth();
			if (row == null || row.length < width) {
				row = new byte[width];
			}
			image.getRaster().getDataElements(left, top + y, width, 1, row);
			return row;
		}
	 
		public byte[] getMatrix() {
			int width = getWidth();
			int height = getHeight();
			int area = width * height;
			byte[] matrix = new byte[area];
			image.getRaster().getDataElements(left, top, width, height, matrix);
			return matrix;
		}
	 
		public boolean isCropSupported() {
			return true;
		}
	 
		public LuminanceSource crop(int left, int top, int width, int height) {
			return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
		}
	 
		public boolean isRotateSupported() {
			return true;
		}
	 
		public LuminanceSource rotateCounterClockwise() {
			int sourceWidth = image.getWidth();
			int sourceHeight = image.getHeight();
			AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
			BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
			Graphics2D g = rotatedImage.createGraphics();
			g.drawImage(image, transform, null);
			g.dispose();
			int width = getWidth();
			return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
		}
	}

}
 
 

测试类：

public class QrCodeDecodeUtilTest {

	public static void main(String[] args)  throws Exception {
		String savePath = "D:\\image\\test.jpg";
		// 解析二维码
		String str = QrCodeDecodeUtil.decode(savePath);
		// 打印出解析出的内容
		System.out.println(str);
	}
}

普通项目需要引入的包
core-3.4.0.jar

maven项目依赖

<!-- 二维码 -->
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.4.0</version>
</dependency>