java二维码编码和解析工具类

java二维码编码和解析工具类

用到两个jar包：

QRCode.jar Qrcodeen.jar

java二维码编码和解析工具类

   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);      }  }