Java生成微信小程序二維碼

太陽碼生成博客鏈接
1.添加依賴

		<dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.2.1</version>
        </dependency>

2.QrCodeUtils類
主方法也在這裏點擊運行就行

import com.alibaba.fastjson.JSONObject;
import com.google.zxing.Result;
import com.google.zxing.*;
import com.google.zxing.common.HybridBinarizer;
import com.zhibi.cms.set.MiniProgram;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * 作者qq1023732997
 */

public class QrCodeUtils {
    public static String decodeQrcode(BufferedImage image) throws NotFoundException {
        MultiFormatReader formatReader = new MultiFormatReader();
        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
        //定義二維碼的參數:
        Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
        hints.put(DecodeHintType.CHARACTER_SET, "utf-8");//定義字符集
        hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
        com.google.zxing.Result result = formatReader.decode(binaryBitmap, hints);//開始解析
        return result.getText();
    }

    public static String getToken() {
        try {
            Map<String, String> map = new LinkedHashMap<String, String>();
            map.put("grant_type", "client_credential");
            map.put("appid", MiniProgram.APP_ID);// 改成自己的appid
            map.put("secret", MiniProgram.APP_secret); //改成自己的secret
            String rt = UrlUtil.sendPost("https://api.weixin.qq.com/cgi-bin/token", map);
            JSONObject json = JSONObject.parseObject(rt);
            if (json.getString("access_token") != null || json.getString("access_token") != "") {
                return json.getString("access_token");
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

    }

    public static void main(String[] args) {
        try {
            URL url = new URL("https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=" + getToken());
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");// 提交模式
            // conn.setConnectTimeout(10000);//連接超時 單位毫秒
            // conn.setReadTimeout(2000);//讀取超時 單位毫秒
            // 發送POST請求必須設置如下兩行
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
            // 發送請求參數
            JSONObject paramJson = new JSONObject();
            paramJson.put("scene", "");//參數
            paramJson.put("path", "pages/index");
            paramJson.put("width", 430);
            printWriter.write(paramJson.toString());
            // flush輸出流的緩衝
            printWriter.flush();
            //開始獲取數據
            BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
            ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
            byte[] buff = new byte[100];
            int rc = 0;
            while ((rc = bis.read(buff, 0, 100)) > 0) {
                swapStream.write(buff, 0, rc);
            }
            ByteArrayInputStream inputStream = new ByteArrayInputStream(swapStream.toByteArray());
            BufferedImage image = ImageIO.read(inputStream);
            BufferedImage subImage = image.getSubimage(0, 0, image.getWidth(), (int) (image.getHeight() * 0.85));
            BufferedImage inputbig = new BufferedImage(256, 256, BufferedImage.TYPE_INT_BGR);
            Graphics2D g = (Graphics2D) inputbig.getGraphics();
            g.drawImage(subImage, 0, 0, 256, 256, null);
            g.dispose();
            inputbig.flush();
            ImageIO.write(inputbig, "jpg", new File("D:\\雲上\\ewm.png"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    }

3.BufferedImageLuminanceSource

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public final class BufferedImageLuminanceSource extends LuminanceSource {
    private final BufferedImage image;
    private final int left;
    private final int top;

    public BufferedImageLuminanceSource(BufferedImage image) {
        this(image, 0, 0, image.getWidth(), image.getHeight());
    }

    public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
        super(width, height);

        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        if (left + width > sourceWidth || top + height > sourceHeight) {
            throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
        }

        for (int y = top; y < top + height; y++) {
            for (int x = left; x < left + width; x++) {
                if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                    image.setRGB(x, y, 0xFFFFFFFF); // = white
                }
            }
        }
        this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
        this.image.getGraphics().drawImage(image, 0, 0, null);
        this.left = left;
        this.top = top;
    }

    @Override
    public byte[] getRow(int y, byte[] row) {
        if (y < 0 || y >= getHeight()) {
            throw new IllegalArgumentException("Requested row is outside the image: " + y);
        }
        int width = getWidth();
        if (row == null || row.length < width) {
            row = new byte[width];
        }
        image.getRaster().getDataElements(left, top + y, width, 1, row);
        return row;
    }

    @Override
    public byte[] getMatrix() {
        int width = getWidth();
        int height = getHeight();
        int area = width * height;
        byte[] matrix = new byte[area];
        image.getRaster().getDataElements(left, top, width, height, matrix);
        return matrix;
    }

    @Override
    public boolean isCropSupported() {
        return true;
    }

    @Override
    public LuminanceSource crop(int left, int top, int width, int height) {
        return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
    }

    @Override
    public boolean isRotateSupported() {
        return true;
    }

    @Override
    public LuminanceSource rotateCounterClockwise() {
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
        BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D g = rotatedImage.createGraphics();
        g.drawImage(image, transform, null);
        g.dispose();
        int width = getWidth();
        return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
    }
}

4.效果圖