一，生成带log的二维码

　　1）生成的二维码是流返回，或者是直接写到指定文件夹

二，准备资料

　　1）引入jar包

         
         
             
      
       com.google.zxing
              
      
       core
              
      
       3.3.0
          
     

　　2)引入工具类

　　　　1.直接使用

import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;import com.google.zxing.common.BitMatrix;public class MatrixToImageWriter {    private static final int BLACK = 0xFF000000;       private static final int WHITE = 0xFFFFFFFF;            private MatrixToImageWriter() {}                   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);           }         }         return image;       }                   public static void writeToFile(BitMatrix matrix, String format, File file) //生成文件方法           throws IOException {         BufferedImage image = toBufferedImage(matrix);         if (!ImageIO.write(image, format, file)) {           throw new IOException("Could not write an image of format " + format + " to " + file);         }       }                   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)//生成流的方法           throws IOException {         BufferedImage image = toBufferedImage(matrix);         //调用log生成工具，如果不需要logo就不调用改工具类         LogoConfig logoConfig = new LogoConfig();          image = logoConfig.LogoMatrix(image);         if (!ImageIO.write(image, format, stream)) {           throw new IOException("Could not write an image of format " + format);         }       }}

　　　　2）logo工具类

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.File;import java.io.IOException;import javax.imageio.ImageIO;public class LogoConfig {         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();            //获取logo,这里可以使用本地文件，也可以由外部传入         BufferedImage logo = ImageIO.read(new File("F:/图片资料/20110711104956189.jpg"));                  g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,                RenderingHints.VALUE_TEXT_ANTIALIAS_ON);        // 开始绘制图片          g2.drawImage(logo, 125, 125,  //这里的125,125决定了logo与上下边距，左右边距的距离                matrixWidth / 6, matrixHeigh / 6, null);// 这里的的/6决定了logo图片的大小        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(                  125, 125, matrixWidth / 6,                  matrixHeigh / 6, 4, 4); ///6这里决定了圆角矩形的大小，4代表矩形边框的宽度        g2.setColor(Color.white);          g2.draw(round);// 绘制圆弧矩形            g2.dispose();          matrixImage.flush();          return matrixImage;      }  }

三，调用

　　@Controller

public class QRcode {        @RequestMapping("getQrcode")     public void getQrcode(String contents,HttpServletRequest request,HttpServletResponse response) {        BitMatrix bitMatrix =null; 　　　　　//解决get乱码问题，没有乱码可以忽略 　　　　　//contents传入的是要生成二维码的内容         String conten = null;

try {             conten = new String(contents.getBytes("ISO-8859-1"),"UTF-8");        } catch (UnsupportedEncodingException e2) {            e2.printStackTrace();        }        //准备参数二维码的大小        int width=300;        int height=300;        //配置参数        Map hints = new HashMap();        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");        // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）  ，这个等级根据logo图片的大小来定，参考logo大小占二维码的比例        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);         MultiFormatWriter multiFormatWriter = new MultiFormatWriter();        try {            bitMatrix = multiFormatWriter.encode(conten, BarcodeFormat.QR_CODE, width, height,hints);        } catch (WriterException e) {            e.printStackTrace();        }                ServletOutputStream outputStream = null;        try {
    　　　　　　　　//获取流            outputStream = response.getOutputStream();        } catch (IOException e1) {            e1.printStackTrace();        }        //File file = new File("F:/test","test.jpg");        try {
    　　　　　　　　//调用返回流的方法            MatrixToImageWriter.writeToStream(bitMatrix, "jpg", outputStream);        } catch (IOException e) {            e.printStackTrace();        }            }    }

四，简单页面示例

 

五，效果展示

        1）点击获取                                              

 

        2）返回内容