用到两个jar包:
QRCode.jar Qrcodeen.jar
java二维码编码和解析工具类
package com.banmacoffee.utils; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; import jp.sourceforge.qrcode.QRCodeDecoder; import jp.sourceforge.qrcode.data.QRCodeImage; import jp.sourceforge.qrcode.exception.DecodingFailedException; public class QRCodeUtils { /** * 编码字符串内容到目标File对象中 * @param encodeddata * @param destFile * @throws IOException */ public static void qrCodeEncode(String encodeddata,File destFile) throws IOException{ Qrcode qrcode = new Qrcode(); qrcode.setQrcodeErrorCorrect(‘M‘); qrcode.setQrcodeEncodeMode(‘B‘); qrcode.setQrcodeVersion(7); byte[] d = encodeddata.getBytes("GBK"); BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB); // createGraphics Graphics2D g = bi.createGraphics(); // set background g.setBackground(Color.WHITE); g.clearRect(0, 0, 139, 139); g.setColor(Color.BLACK); if (d.length > 0 && d.length < 123) { boolean[][] b = qrcode.calQrcode(d); for (int i = 0; i < b.length; i++) { for (int j = 0; j < b.length; j++) { if (b[j][i]) { g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); } } } } g.dispose(); bi.flush(); ImageIO.write(bi, "png", destFile); System.out.println("Input Encoded data is:"+encodeddata); } /** * 解析二维码,返回解析内容 * @param imageFile * @return */ public static String qrCodeDecode(File imageFile) { String decodedData = null; QRCodeDecoder decoder = new QRCodeDecoder(); BufferedImage image = null; try { image = ImageIO.read(imageFile); } catch (IOException e) { System.out.println("Error: " + e.getMessage()); } try { decodedData = new String(decoder.decode(new J2SEImage(image)), "GBK"); System.out.println("Output Decoded Data is:"+decodedData); } catch (DecodingFailedException dfe) { System.out.println("Error: " + dfe.getMessage()); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return decodedData; } public static void main(String[] args) { String FilePath = "C:\\Demo\\QRCode.png"; File qrFile = new File(FilePath); //编码 String encodeddata = "{id:10022,name:wandern}"; try { QRCodeUtils.qrCodeEncode(encodeddata, qrFile); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }; //解码 String reText = QRCodeUtils.qrCodeDecode(qrFile); System.out.println(reText); } } class J2SEImage implements QRCodeImage { BufferedImage image; public J2SEImage(BufferedImage image) { this.image = image; } public int getWidth() { return image.getWidth(); } public int getHeight() { return image.getHeight(); } public int getPixel(int x, int y) { return image.getRGB(x, y); } }