二维码的生成及解码-java-web

package demo.twoDimensionalCode.serviceImp; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.OutputStream; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; import demo.twoDimensionalCode.service.QRCodeEncoderService; /** * 生成二维码 * @author dingcy * */ public class QRCodeEncoderServiceImp implements QRCodeEncoderService { public void QRCodeEncoder(String imgPath,String imgFormat,String imgShowData,int imgSize) throws Exception { Qrcode qrcode=new Qrcode(); qrcode.setQrcodeErrorCorrect('M'); qrcode.setQrcodeEncodeMode('B'); qrcode.setQrcodeVersion(7); StringBuffer sb = new StringBuffer(imgShowData); String result =sb.toString(); byte [] bt = result.getBytes("utf-8"); BufferedImage bi = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB); Graphics2D gh2D = bi.createGraphics(); gh2D.setBackground(Color.WHITE); gh2D.clearRect(0, 0, imgSize, imgSize); gh2D.setColor(Color.BLACK); if (bt.length>0){ boolean[][] s = qrcode.calQrcode(bt); for (int i = 0; i < s.length; i++) { for (int j = 0; j < s.length; j++) { if (s[j][i]) { gh2D.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); } } } } gh2D.dispose(); bi.flush(); File file = new File(imgPath); ImageIO.write(bi, imgFormat, file); System.out.println("doned!"); } /** * 流的方式 */ public void QRCodeEncoder(OutputStream OS,String imgFormat,String imgShowData,int imgSize) throws Exception { Qrcode qrcode=new Qrcode(); qrcode.setQrcodeErrorCorrect('M'); qrcode.setQrcodeEncodeMode('B'); qrcode.setQrcodeVersion(7); StringBuffer sb = new StringBuffer(imgShowData); String result =sb.toString(); byte [] bt = result.getBytes("utf-8"); BufferedImage bi = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB); Graphics2D gh2D = bi.createGraphics(); gh2D.setBackground(Color.WHITE); gh2D.clearRect(0, 0, imgSize, imgSize); gh2D.setColor(Color.BLACK); if (bt.length>0){ boolean[][] s = qrcode.calQrcode(bt); for (int i = 0; i < s.length; i++) { for (int j = 0; j < s.length; j++) { if (s[j][i]) { gh2D.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); } } } } gh2D.dispose(); bi.flush(); ImageIO.write(bi, imgFormat, OS); System.out.println("doned!"); } }