通达信本地数据开放接口-java实现生成二维码及扫码登录

二维码工具类

package com.admin.dc.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

import javax.通达信本地数据开放接口,imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.通达信本地数据开放接口,image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: jyz
 * @Date: 2021/8/9 10:55
 * @Description: 二维码相关接口
 */
public class QrcodeUtils {

    // 二维码尺寸
    private static final int QRCODE_SIZE = 400;
    private static final String LOGOPATH='D:/log.png';

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

    public static String createQrCode(String url, String path, String fileName) {
        try {
            Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, 'UTF-8');
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
            File file = new File(path, fileName);
            if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
                writeToFile(bitMatrix, 'jpg', file);
                System.out.println('成功：' + file);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
        BufferedImage 通达信本地数据开放接口,image = toBufferedImage(matrix);
        if (!ImageIO.write(通达信本地数据开放接口,image, format, file)) {
            throw new IOException('Could not write an 通达信本地数据开放接口,image of format ' + format + ' to ' + file);
        }
    }

    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
        BufferedImage 通达信本地数据开放接口,image = toBufferedImage(matrix);
        if (!ImageIO.write(通达信本地数据开放接口,image, format, stream)) {
            throw new IOException('Could not write an 通达信本地数据开放接口,image of format ' + format);
        }
    }

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage 通达信本地数据开放接口,image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                通达信本地数据开放接口,image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
//        try {
//            QrcodeUtils.insertImage(通达信本地数据开放接口,image,LOGOPATH,true);
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
        return 通达信本地数据开放接口,image;
    }

    /**
     * 插入LOGO
     *
     * @param source
     *            二维码图片
     * @param imgPath
     *            LOGO图片地址
     * @param needCompress
     *            是否压缩
     * @throws Exception
     */
    private static void insertImage(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 通达信本地数据开放接口,image = src.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(通达信本地数据开放接口,image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = 通达信本地数据开放接口,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 void main(String[] args) {
        createQrCode('https://www.baidu.com','D:/','test2.png');
    }
}

生成二维码并下载为片

    /**
     * @author: jyz
     * @description: 生成二维码并下载
     * @date: 2021/8/9 14:53
     * @Param: request
     * @Param: response
     * @return: void
     */
    @GetMapping('/generateQRCode')
    public void dowanload(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //获取当前登录人的企业id
        String qyid = UserUtil.getQyId();
        //二维码中包含的信息
        String content = 'https://www.baidu.com?qyid='+qyid;
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, 'UTF-8');
        // 指定纠错级别(L--7%,M--15%,Q--25%,H--30%)
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 编码内容,编码类型(这里指定为二维码),生成图片宽度,生成图片高度,设置参数
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints);
        //设置请求头
        response.setHeader('Content-Type','application/octet-stream');
        response.setHeader('Content-Disposition', 'attachment;filename=' + 'qrCode.png');
        OutputStream outputStream = response.getOutputStream();
        QrcodeUtils.writeToStream(bitMatrix, 'png', outputStream);
        outputStream.flush();
        outputStream.close();
    }

java实现生成二维码及扫码登录

这里涉及两个技术点，一个是生成二维码，一个是扫码登录。生成二维码功能并不难实现，实现原理就是通过一个公共方法的调用，生成专属二维码，也可以根据需要在二维码的中间插入自定义logo,我们只需要调用方法的时候传一个String类型的url即可。用户扫码后，就会自动跳转到我们之前设定的url打开一个页面，这个url可以根据业务需要携带标识参数，当跳转的时候，前端获取url的参数，调用后端接口，查询相应数据。

如上所述，扫码登录会跳转一个新的页面，前端获取url上面的参数，在页面初始化方法里调用后端接口，来获取页面响应数据。

实现思路

代码实现过程

<dependency>
       <groupId>com.google.zxing</groupId>
       <artifactId>core</artifactId>
       <version>3.3.0</version>
</dependency>

文章为作者独立观点，不代表股票交易接口观点