java生成二维码并且给二维码添加logo

java生成二维码，具体代码如下所示：

package com.bus.wx.action.code;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import com.bus.plugin.wx.action.WxAction;
import com.bus.wx.util.Limits;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.lys.sys.log.Log;
/**
 * 条形码、二维码
 * @author hwj
 *
 */
@Scope(value = "prototype")
@Controller("Bar_Qr_Code_Action")
@RequestMapping(value="plug/wx/wwz/{bcflag}/barqrcode")
public class Bar_Qr_Code_Action extends WxAction{
 private static final int LogoPart = 4;
 private static final int BLACK = 0xFF000000;//用于设置图案的颜色
  private static final int WHITE = 0xFFFFFFFF; //用于背景色
  String format = "png";
public static BufferedImage toBufferedImage(BitMatrix matrix) {
  int width = matrix.getWidth();
  int height = matrix.getHeight();
  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  for (int x = 0; x < width; x++) {
    for (int y = 0; y < height; y++) {
      image.setRGB(x, y, (matrix.get(x, y) ? BLACK : WHITE));
//     image.setRGB(x, y, (matrix.get(x, y) ? Color.YELLOW.getRGB() : Color.CYAN.getRGB()));
    }
  }
  return image;
}
  public BufferedImage LogoMatrix(BufferedImage matrixImage) throws IOException{
     /**
      * 读取二维码图片，并构建绘图对象
      */
     Graphics2D g2 = matrixImage.createGraphics(); 

     int matrixWidth = matrixImage.getWidth();
     int matrixHeigh = matrixImage.getHeight(); 

     /**
      * 读取Logo图片
      */
     String path=request.getSession().getServletContext().getRealPath("/images/logo/dzjkklog.png");
     BufferedImage logo = ImageIO.read(new File(path)); 

     //开始绘制图片
     g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制
     BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
     g2.setStroke(stroke);// 设置笔画对象
     //指定弧度的圆角矩形
     RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);
     g2.setColor(Color.white);
     g2.draw(round);// 绘制圆弧矩形 

     //设置logo 有一道灰色边框
     BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
     g2.setStroke(stroke2);// 设置笔画对象
     RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);
     g2.setColor(new Color(128,128,128));
     g2.draw(round2);// 绘制圆弧矩形 

     g2.dispose();
     matrixImage.flush() ;
     return matrixImage ;
   } 

 /**
 * 生成二维码：直接将生成的二维码传输到前台页面
 * @param bcflag
 */
 @RequestMapping(value="createQrCodes",method = RequestMethod.GET)
 public void createQrCodes(@PathVariable String bcflag,String dastid){

 String url="扫二维码出现的内容";
 if(url!=null&&!"".equals(url)){
  ServletOutputStream stream=null;
  try {
  int width=430;
  int height=430;
  stream=response.getOutputStream();
  QRCodeWriter writer=new QRCodeWriter();
   Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>(); 

      hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
      hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
      hints.put(EncodeHintType.MARGIN, 1);//设置二维码边的空度，非负数
      BitMatrix bitMatrix = new MultiFormatWriter().encode(url,//要编码的内容
          BarcodeFormat.QR_CODE,
          width, //条形码的宽度
          height, //条形码的高度
          hints);
  //BitMatrix m=writer.encode(url, BarcodeFormat.QR_CODE, height,width);
   BufferedImage image = toBufferedImage(bitMatrix);
    image = LogoMatrix(image);
     if (!ImageIO.write(image, format, stream)) {
       throw new IOException("Could not write an image of format " + format);
     }
  } catch (Exception e) {
   Log.in.info(e.getMessage());
  }finally{
   if(stream!=null){
   try {
    stream.flush();
    stream.close();
    } catch (IOException e) {
    Log.in.info(e.getMessage());
    }
   }
  }
  }
 }
}

总结

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