生成二维码工具类及使用

工具类：

package com.guoqidangjian.chat.service.service.impl;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.guoqidangjian.chat.contract.service.QRcodeService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by SunZhenYang on 2015/10/16.
 */
@Service("qRcodeService")
public class QRcodeServiceImpl implements QRcodeService {
    // 图片宽度的一般
    private static final int IMAGE_WIDTH = 80;
    private static final int IMAGE_HEIGHT = 80;
    private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
    private static final int FRAME_WIDTH = 2;

    // 二维码写码器
    private static MultiFormatWriter mutiWriter = new MultiFormatWriter();

    @Override
    public String getQRcodeUrl(String content,int width, int height, String srcImagePath, String destImagePath) {
        return encode( content, width,  height,  srcImagePath,  destImagePath);
    }

    private String encode(String content, int width, int height, String srcImagePath, String destImagePath) {
        try {
            if(!StringUtils.isBlank(srcImagePath)){
                ImageIO.write(genBarcode(content, width, height, srcImagePath), "jpg", new File(destImagePath));
            }else{
                ImageIO.write(genBarcode(content, width, height), "jpg", new File(destImagePath));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return destImagePath;
    }

    private static BufferedImage genBarcode(String content, int width, int height, String srcImagePath) throws WriterException,
            IOException {
        // 读取源图像
        BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
                IMAGE_HEIGHT, true);
        int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
        for (int i = 0; i < scaleImage.getWidth(); i++) {
            for (int j = 0; j < scaleImage.getHeight(); j++) {
                srcPixels[i][j] = scaleImage.getRGB(i, j);
            }
        }

        Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
        hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 生成二维码
        BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, hint);

        // 二维矩阵转为一维像素数组
        int halfW = matrix.getWidth() / 2;
        int halfH = matrix.getHeight() / 2;
        int[] pixels = new int[width * height];

        for (int y = 0; y < matrix.getHeight(); y++) {
            for (int x = 0; x < matrix.getWidth(); x++) {
                // 读取图片
                if (x > halfW - IMAGE_HALF_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH
                        && y < halfH + IMAGE_HALF_WIDTH) {
//                    pixels[y * width + x] = srcPixels[x - halfW
//                            + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
                }
                // 在图片四周形成边框
                else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        - IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
                    pixels[y * width + x] = 0xfffffff;
                } else {
                    // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                    pixels[y * width + x] = matrix.get(x, y) ? 0xff000000
                            : 0xfffffff;
                }
            }
        }

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        image.getRaster().setDataElements(0, 0, width, height, pixels);

        return image;
    }
    private static BufferedImage genBarcode(String content, int width, int height) throws WriterException,
            IOException {


        Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
        hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 生成二维码
        BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, hint);

        // 二维矩阵转为一维像素数组
        int halfW = matrix.getWidth() / 2;
        int halfH = matrix.getHeight() / 2;
        int[] pixels = new int[width * height];

        for (int y = 0; y < matrix.getHeight(); y++) {
            for (int x = 0; x < matrix.getWidth(); x++) {
                // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                pixels[y * width + x] = matrix.get(x, y) ? 0xff000000 : 0xfffffff;
            }
        }

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        image.getRaster().setDataElements(0, 0, width, height, pixels);

        return image;
    }
    /**
     * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
     *
     * @param srcImageFile
     *            源文件地址
     * @param height
     *            目标高度
     * @param width
     *            目标宽度
     * @param hasFiller
     *            比例不对时是否需要补白：true为补白; false为不补白;
     * @throws IOException
     */
    private static BufferedImage scale(String srcImageFile, int height,
                                       int width, boolean hasFiller) throws IOException {
        double ratio = 0.0; // 缩放比例
        File file = new File(srcImageFile);
        BufferedImage srcImage = ImageIO.read(file);
        Image destImage = srcImage.getScaledInstance(width, height,
                BufferedImage.SCALE_SMOOTH);
        // 计算比例
        if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
            if (srcImage.getHeight() > srcImage.getWidth()) {
                ratio = (new Integer(height)).doubleValue()
                        / srcImage.getHeight();
            } else {
                ratio = (new Integer(width)).doubleValue()
                        / srcImage.getWidth();
            }
            AffineTransformOp op = new AffineTransformOp(
                    AffineTransform.getScaleInstance(ratio, ratio), null);
            destImage = op.filter(srcImage, null);
        }
        if (hasFiller) {// 补白
            BufferedImage image = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D graphic = image.createGraphics();
            graphic.setColor(Color.white);
            graphic.fillRect(0, 0, width, height);
            if (width == destImage.getWidth(null))
                graphic.drawImage(destImage, 0,
                        (height - destImage.getHeight(null)) / 2,
                        destImage.getWidth(null), destImage.getHeight(null),
                        Color.white, null);
            else
                graphic.drawImage(destImage,
                        (width - destImage.getWidth(null)) / 2, 0,
                        destImage.getWidth(null), destImage.getHeight(null),
                        Color.white, null);
            graphic.dispose();
            destImage = image;
        }
        return (BufferedImage) destImage;
    }
}

 

调用接口：

package com.guoqidangjian.chat.contract.service;

/**
 * Created by SunZhenYang on 2015/10/16.
 */
public interface QRcodeService {

    /**
     * 获取二维码图片，支持生成二维码中加入图片
     *
     * @param content       二维码中包含的内容
     * @param width         图片的宽度
     * @param height          图片高度
     * @param srcImagePath 需要插入的图片地址,没有可以为空
     * @param destImagePath 生成的二维码路径
     * @return
     */

    String getQRcodeUrl(String content,int width, int height, String srcImagePath, String destImagePath);
}

controller 调用方法代码：

       /**
        * 生成二维码
        * @param id
        * @param title
        * @param content
        * @param meetDate 会议时间
        * @param request
        * @param model
        * @return
        */
       @RequestMapping(value="/threeLesson/getQRcodeurl",method=RequestMethod.GET)
       public String getQRcodeurl(String id,String meetDate,HttpServletRequest request,HttpServletResponse response, ModelMap model) throws UnsupportedEncodingException{    
          request.setCharacterEncoding("gb2312"); 
          response.setContentType("text/html;charset=utf-8");          
          String title = request.getParameter("title");
          
          title= new String(request.getParameter("title").getBytes("ISO-8859-1"),"utf-8");
          
          String qRcontent="{\"id\" : "+id+", \"title\" : "+title+", \"meetDate\" : "+meetDate+"}";
          //简单的时间戳
          Date date = new Date();
          SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
          String str = sdf.format(date);
          
          String temporaryPath= System.getProperty("java.io.tmpdir"); 
          temporaryPath=temporaryPath+str;
          String qRcodeUrl=qRcodeService.getQRcodeUrl(qRcontent,300, 300, "", temporaryPath);          
          model.addAttribute("qRcodeUrl",qRcodeUrl);
          return "threeLesson/RQcode";
       }