zxing生成二维码和读取二维码

当然，首先要导入zxing的jar包。

生成二维码代码:

package com.imooc.zxing;

import java.io.File;
import java.nio.file.Path;
import java.util.HashMap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * java代码生成二维码<br>
 *
 * @author Administrator
 *
 */
public class CreateQRCode {

    public static void main(String[] args) {
        int width = 300;
        int height = 300;
        String format = "png";
        String content = "http://www.hupu.com";

        // 定义二维码参数
        HashMap hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 字符集
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 纠错级别
        hints.put(EncodeHintType.MARGIN, 2);// 空白

        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
                    BarcodeFormat.QR_CODE, width, height, hints);
            Path file = new File("E:/code/img.png").toPath();

            MatrixToImageWriter.writeToPath(bitMatrix, format, file);

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

    }

}

生成二维码如下：

读取二维码:

package com.imooc.zxing;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

public class ReadQRCode {

    public static void main(String[] args) {
        try {
            MultiFormatReader formatReader = new MultiFormatReader();
            File file = new File("E:/code/img.png");
            BufferedImage image = ImageIO.read(file);

            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
                    new BufferedImageLuminanceSource(image)));

            HashMap hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 字符集

            Result result = formatReader.decode(binaryBitmap, hints);

            System.out.println("解析之后的结果:" + result.toString());
            System.out.println("二维码格式类型:" + result.getBarcodeFormat());
            System.out.println("二维码文本内容:" + result.getText());

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

    }

}

代码运行结果: