ZXing 是一个开源 Java 类库用于解析多种格式的 1D/2D 条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。其提供了多种平台下的客户端包括：J2ME、J2SE和Android。<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>1. com.google.zxing.MultiFormatWriter 根据内容以及图像编码参数生成图像2D矩阵。2. com.google.zxing.client.j2se.MatrixToImageWriter 根据图像矩阵生成图片文件或图片缓存 BufferedImage 。
public void encode(String content, String filepath) throws WriterException, IOException {
int width = 100;
int height = 100;
Map<EncodeHintType, Object> encodeHints = new HashMap<EncodeHintType, Object>();
encodeHints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, encodeHints);
Path path = FileSystems.getDefault().getPath(filepath);
MatrixToImageWriter.writeToPath(bitMatrix, "png", path);
}解析二维码图片
javax.imageio.ImageIO 读取图片文件，并存为一个 java.awt.image.BufferedImage对象。java.awt.image.BufferedImage 转换为 ZXing 能识别的com.google.zxing.BinaryBitmap 对象。3. com.google.zxing.MultiFormatReader 根据图像解码参数来解析com.google.zxing.BinaryBitmap 。public String decode(String filepath) throws IOException, NotFoundException {
BufferedImage bufferedImage = ImageIO.read(new FileInputStream(filepath));
LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap bitmap = new BinaryBitmap(binarizer);
HashMap<DecodeHintType, Object> decodeHints = new HashMap<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
Result result = new MultiFormatReader().decode(bitmap, decodeHints);
return result.getText();
}
