关于二维码生成工具类简介

        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.0.0</version>
    </dependency>

其次：咱们就可以写一个工具类

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.net.ssl.HttpsURLConnection;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;


/**
 * 生成二维码工具类
 */
@Slf4j
public class ScancodeUtils {

    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;

    /**
     * 默认的二维码（不带图片）
     * @param content
     * @return
     */
    public static BitMatrix createScancode(String content){

        //二维码宽高
       // int width=200;
        //int height=200;

        Map<EncodeHintType,Object> hints=new HashMap<EncodeHintType, Object>();
        //字符集编码
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        //容错级别为H
        hints.put(EncodeHintType.ERROR_CORRECTION , ErrorCorrectionLevel.H);
        //白边的宽度，可取0~4
        hints.put(EncodeHintType.MARGIN , 0);
        BitMatrix bitMatrix=null;
        try {
            //生成矩阵
            bitMatrix=new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,QRCODE_SIZE,QRCODE_SIZE,hints);
        }catch (WriterException e){
            e.printStackTrace();
        }
        return bitMatrix;
    }


    /**
     * 生成二维码流（带图片的）
     * @param content	源内容
     * @param imgPath	生成二维码保存的路径
     * @param needCompress	是否要压缩
     * @return		返回二维码图片
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入图片
        ScancodeUtils.insertImage(image, imgPath, needCompress);
        return image;
    }

    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        log.info("imgPath：{}",imgPath);
        URL url = new URL(imgPath);
        Image src = ImageIO.read(url);
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        // 压缩LOGO
        if (needCompress) {
            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();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            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);
        graph.dispose();


    }

    public static BufferedImage encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = ScancodeUtils.createImage(content, imgPath, needCompress);
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
        // 输出到文件流
        ImageIO.write(image, "jpg ", imOut);
        return image;
    }


    /**
     * 判断图片地址是否为有效图片
     * @param posturl
     * @return
     * @throws IOException
     */
    public static Integer state(String posturl) throws IOException{
        log.info("posturl:{}",posturl);
        URL urlStr = new URL(null, posturl, new sun.net.www.protocol.https.Handler());
        log.info("urlStr:{}",urlStr);
        HttpsURLConnection connection = (HttpsURLConnection) urlStr.openConnection();
        int state = connection.getResponseCode();
        if (state == 200) {
            System.out.println("====1====");
            return state;
        } else {
            System.out.println("====2====");
            return state;
        }
    }

}

简单的二维码就这么生成了
这里注意 参数：
String content ：就是你要输入的内容 当然 咱们也可以改成Objcet 对象
String imgPath ：图片路径
boolean needCompress ： 是否压缩！
没有参数的朋友 可以只填写内容，其他填入null 就可以咯！
喜欢的朋友可以参考学习，很开心今天又学到一个点，欢迎大家学习交流！！