java实现二维码的编码与解码-白红宇

java实现二维码的编码与解码

阅读量：6231 次

发布时间：2019-06-21

本文共 4547 字，大约阅读时间需要 15 分钟。

<blockquote> 本文中实现二维码的操作依赖于google的zxing，需要添加的jar包有：core.jar 和 javase.jar 依赖的类有: <div> <pre>import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat; import com.google.zxing.BinaryBitmap; import com.google.zxing.DecodeHintType; import com.google.zxing.EncodeHintType; import com.google.zxing.LuminanceSource; import com.google.zxing.MultiFormatReader; import com.google.zxing.MultiFormatWriter; import com.google.zxing.ReaderException; import com.google.zxing.Result; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.client.j2se.MatrixToImageWriter; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer;</pre>

</div>

<h4>二维码编码：</h4>

<div> <pre>/** * 二维码编码 * @param str 需要编码的字符串 * @return */ @SuppressWarnings("unchecked") public static File encode(String str) { try { SimpleDateFormat sdDateFormat = new SimpleDateFormat("yyyyMMddhhmmss"); String path = "./encode" + sdDateFormat.format(new Date()) + ".png"; int width = 180; int height = 160; Hashtable hints = new Hashtable(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); BitMatrix byteMatrix; byteMatrix = new MultiFormatWriter().encode(str,BarcodeFormat.QR_CODE, width, height,hints); File file = new File(path); MatrixToImageWriter.writeToFile(byteMatrix, "png", file); return file; } catch (Exception e) { e.printStackTrace(); return null; } }</pre> </div>

<h4>二维码解码:</h4>

<div> <pre>/** * 二维码解码 * @param file 需要解码的文件(如图片) * @return */ @SuppressWarnings("unchecked") public static Result decode(File file) { try { BufferedImage image; try { image = ImageIO.read(file); if (image == null) { System.out.println("Could not decode image"); } LuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer( source)); Result result; Hashtable hints = new Hashtable(); hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); result = new MultiFormatReader().decode(bitmap, hints); return result; } catch (IOException ioe) { System.out.println(ioe.toString()); return null; } catch (ReaderException re) { System.out.println(re.toString()); return null; } } catch (Exception ex) { return null; } }</pre> </div></blockquote>

转载于:https://my.oschina.net/sorthWindow/blog/110902

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