条形码二维码编码解码

• 条形码编码

public static void encode(String contents, int width, int height, OutputStream outputStream) {
		int codeWidth = 3 + // start guard
				(7 * 6) + // left bars
				5 + // middle guard
				(7 * 6) + // right bars
				3; // end guard
		codeWidth = Math.max(codeWidth, width);
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
					BarcodeFormat.QR_CODE, codeWidth, height, null);
			MatrixToImageWriter
					.writeToStream(bitMatrix,"png",outputStream);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

• 条形码解码

public static String decode(String imgPath) {
		BufferedImage image = null;
		Result result = null;
		try {
			image = ImageIO.read(new File(imgPath));
			if (image == null) {
				System.out.println("the decode image may be not exit.");
			}
			LuminanceSource source = new BufferedImageLuminanceSource(image);
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

			result = new MultiFormatReader().decode(bitmap, null);
			return result.getText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

• 二维码编码

public static void encode2(String contents, int width, int height, String imgPath) {
		Hashtable hints = new Hashtable();
		// 指定纠错等级
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
		// 指定编码格式
		hints.put(EncodeHintType.CHARACTER_SET, "GBK");
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
					BarcodeFormat.QR_CODE, width, height, hints);

			MatrixToImageWriter
					.writeToFile(bitMatrix, "png", new File(imgPath));

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

• 二维码解码

public static String decode2(String imgPath) {
		BufferedImage image = null;
		Result result = null;
		try {
			image = ImageIO.read(new File(imgPath));
			if (image == null) {
				System.out.println("the decode image may be not exit.");
			}
			LuminanceSource source = new BufferedImageLuminanceSource(image);
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

			Hashtable hints = new Hashtable();
			hints.put(DecodeHintType.CHARACTER_SET, "GBK");

			result = new MultiFormatReader().decode(bitmap, hints);
			return result.getText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

• 测试

public static void main(String[] args) {

		// 条形码
		String imgPath = "target\\zxing_EAN13.png";
		String contents = "6923450657713";
		int width = 105, height = 50;
		
		ZxingHandler.encode(contents, width, height, imgPath);
		System.out.println("finished zxing EAN-13 encode.");

		String decodeContent = ZxingHandler.decode(imgPath);
		System.out.println("解码内容如下：" + decodeContent);
		System.out.println("finished zxing EAN-13 decode.");
		
		// 二维码
		String imgPath2 = "target\\zxing.png";
		String contents2 = "Hello Gem, welcome to Zxing!"
				+ "\nBlog [ http://thinkgem.iteye.com ]"
				+ "\nEMail [ [email protected] ]";
		int width2 = 300, height2 = 300;

		ZxingHandler.encode2(contents2, width2, height2, imgPath2);
		System.out.println("finished zxing encode.");

		String decodeContent2 = ZxingHandler.decode2(imgPath2);
		System.out.println("解码内容如下：" + decodeContent2);
		System.out.println("finished zxing decode.");
		
	}