后台生成二维码

package com.cn.service.face.quickmark;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringUtils;
import org.springframework.util.Assert;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;

public class TestQRCodes {

    private static final boolean NEEDCOMPRESS = false;

    private static String LOGO_URL;
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;

    static{
        LOGO_URL = "";// 测试图片路径地址
    }

    /**
     * 生成二维码的工具类
     *
     * @param data
     *            二维码中携带的数据
     * @param width
     *            二维码的宽度
     * @param height
     *            二维码的高度
     * @return 返回base64格式的图片（data:image/gif;base64,xxxx） <br>
     *         eg： <code>
     * <img alt="" src="data:image/gif;base64,xxxx">
     * </code>
     */
    public static String createQRCode(String data, int width, int height, String isPicture) {

//        Assert.assertTrue("param data cannot empty.", data != null && data.trim().length() > 0);
//
//        Assert.assertTrue("param width and height must gt 0.", width > 0 && height > 0);

        ByteArrayOutputStream bos = null;

        MultiFormatWriter formatWriter = new MultiFormatWriter();

        Hashtable<EncodeHintType, Object> param = new Hashtable<EncodeHintType, Object>();
        param.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);
        param.put(EncodeHintType.CHARACTER_SET, "utf-8");
        param.put(EncodeHintType.MARGIN, 0);

        try{
            BitMatrix bitMatrix = formatWriter
                    .encode(data, BarcodeFormat.QR_CODE, width, height, param);
            // 1.1去白边
            int[] rec = bitMatrix.getEnclosingRectangle();
            int resWidth = rec[2] + 1;
            int resHeight = rec[3] + 1;
            BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
            resMatrix.clear();
            for (int i = 0; i < resWidth; i++){
                for (int j = 0; j < resHeight; j++){
                    if (bitMatrix.get(i + rec[0], j + rec[1])){
                        resMatrix.set(i, j);
                    }
                }
            }
            int width1 = resMatrix.getWidth();
            int height1 = resMatrix.getHeight();
            BufferedImage qrcode = new BufferedImage(width1, height1, BufferedImage.TYPE_INT_RGB);
            for (int x = 0; x < width1; x++){
                for (int y = 0; y < height1; y++){
                    qrcode.setRGB(x, y, resMatrix.get(x, y) == true ? Color.BLACK.getRGB() : Color.WHITE
                            .getRGB());
                }
            }
            // 添加logo图片
            if (StringUtils.isNotEmpty(LOGO_URL) && StringUtils.isNotEmpty(isPicture)){
                insertImage(width1, qrcode, LOGO_URL, NEEDCOMPRESS);
            }
            bos = new ByteArrayOutputStream();
            ImageIO.write(qrcode, "png", bos);

            String img = StringUtils.deleteWhitespace(Base64.encodeBase64String(bos.toByteArray()));
            return String.format("data:image/png;base64,%s", img);
        } catch (Exception e){
            throw new RuntimeException(e);
        } finally{
            if (bos != null){
                try{
                    bos.close();
                } catch (IOException e){
                }
            }
        }

    }

    private static void insertImage(int QRCODE_SIZE, BufferedImage source, String imgPath,
                                    boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()){
            System.err.println("" + imgPath + "   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress){ // 压缩LOGO
            if (width > WIDTH){
                width = WIDTH;
            }
            if (height > HEIGHT){
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        // Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        // graph.draw(shape); 去除图片白边
        graph.dispose();
    }

    /**
     * @param data
     *            二维码携带的数据
     * @param size
     *            二维码的宽、高
     * @return
//     * @see WechatValidateUtils#generateQRCode(String, int, int)
     */
    public static String createQRCode(String data, int size, String isPicture) {
        return createQRCode(data, size, size, isPicture);
    }

    // 测试
    public static void main(String[] args) throws Exception {
        // 生成二维码
        String url = "http://www.sina.com.cn";
        String src = createQRCode(url, 200, "1");
        System.out.println(url.length());
        System.out.println(src);
        System.out.println("执行完毕!");
    }
}