Java——二维码

使用zxing生成二维码

引入zxing依赖库：

<dependency>
    <groupId>com.google.zxinggroupId>
    <artifactId>coreartifactId>
    <version>3.3.3version>
dependency>
<dependency>
    <groupId>com.google.zxinggroupId>
    <artifactId>javaseartifactId>
    <version>3.3.3version>
dependency>

生成二维码：

@Test
public void encode() {
	final int width = 300;
	final int height = 300;
	final String format = "png";
	String content = "com.tim.test.qrcode";
	
	final Map<EncodeHintType, Object> hints = new HashMap<>();
	hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
	hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
	hints.put(EncodeHintType.MARGIN, 2);

	try {
		final BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
		MatrixToImageWriter.writeToPath(matrix,format,new File("D:/my.png").toPath());
	} catch (WriterException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	}
}

解析二维码：

@Test
public void decode() {
	final MultiFormatReader reader = new MultiFormatReader();
	File image = new File("D:/my.png");
	try {
		final BufferedImage bufferedImage = ImageIO.read(image);
		final BinaryBitmap binaryBitmap = new BinaryBitmap(
				new HybridBinarizer(new BufferedImageLuminanceSource(bufferedImage)));
		final Map hints = new HashMap<>();
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		final Result result = reader.decode(binaryBitmap, hints);
		System.out.println(result.getText());
	} catch (NotFoundException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	}
}