zxing

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.sankuai.cx.etcp.code.exception.BizException;
import com.sankuai.cx.etcp.code.exception.ErrorEnum;
import lombok.extern.slf4j.Slf4j;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author:wangchao
 * @Date: 2019/2/19 下午2:19
 * @Description:
 **/
@Slf4j
public class ZxingQrCodeUtil {

    private static String FORMAT = "png";//二维码格式

    /**
     *
     * @param content 二维码内容
     * @param width 宽
     * @param height 高
     * @param errorCorrection 容错登记
     * @return
     */
    public static String createZxingqrCode(String content,int width,int height,String errorCorrection){
        //定义二维码参数
        Map hints=new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "iso-8859-1");//设置编码
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.valueOf(errorCorrection));//设置容错等级
        hints.put(EncodeHintType.MARGIN, 0);//设置边距默认是5
        try {
            BitMatrix bitMatrix=new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            BitMatrix resbitMatrix  = deleteWhite(bitMatrix);//删除白边
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(resbitMatrix,FORMAT,baos);
            byte[] b = baos.toByteArray();

//            Path path = new File("/Users/charlie/Desktop/qr.png").toPath();
//            MatrixToImageWriter.writeToPath(bitMatrix, FORMAT, path);//写到指定路径下
            return Base64.getEncoder().encodeToString(b);
        } catch (Exception e) {
            throw new BizException(e,ErrorEnum.ZXING_ERROR.getCode());
        }
    }
    //读取二维码
    public static void readZxingQrCode(){
        MultiFormatReader reader = new MultiFormatReader();
        File file = new File("/Users/charlie/Desktop/yitongxing.jpg");
        try {
            BufferedImage image = ImageIO.read(file);
            BinaryBitmap binaryBitmap=new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
            Map hints=new HashMap();
            hints.put(DecodeHintType.CHARACTER_SET, StandardCharsets.ISO_8859_1);//设置编码
//            hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
            hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);

            Result result = reader.decode(binaryBitmap,hints);
            byte[] b = result.getRawBytes();
            System.out.println("解析结果:"+result.toString());
            String s = HexUtil.byteToHex(result.toString().getBytes(StandardCharsets.ISO_8859_1));
            System.out.println(s);
            System.out.println(s.length());
            System.out.println("二维码格式:"+result.getBarcodeFormat());
            System.out.println("二维码文本内容:"+result.getText());
        } catch (Exception e) {
            log.error("read zxing pic error",e);
        }
    }

  	/**
  	* 消除白边
  	*/
    public static BitMatrix deleteWhite(BitMatrix matrix){
        int[] rec = matrix.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 (matrix.get(i + rec[0], j + rec[1])) {
                    resMatrix.set(i, j);
                }
            }
        }
        return resMatrix;
    }

    public static void main(String[] args) {
//        String s = "8001883030303030303030303133363334323203115110300001083132031019400310194000000500203012310120064D54445001010055602A44BF82FE0C8793B8077CC5DCAFD2863E803F5C413F2C5895AC79A6BC7B7E9AC440F637D3A901838D1D741F55869D606493DC5E7D9E25FB1D59F34BD7954CC30089";
//        byte[] b = HexUtil.hexStringToBytes(s);
//        String ss = new String(b, StandardCharsets.ISO_8859_1);
//        createZxingqrCode(ss,240,240,"M");
        readZxingQrCode();
    }


}