import java.io.File;
import java.io.IOException;
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.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class TestZXing {
    public static void main(String[] args) {
        int width=300;
        int height=300;
        String format="png";
        String contents="www.baidu.com";
        HashMap map=new HashMap();
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");
        map.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.M);
        map.put(EncodeHintType.MARGIN, 0);
        try {
            BitMatrix bm = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height);
            Path file=new File("D:/img.png").toPath();
            MatrixToImageWriter.writeToPath(bm, format, file);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

public class TestRead {
    public static void main(String[] args) {
        try {
            MultiFormatReader reader=new MultiFormatReader();//需要详细了解MultiFormatReader的小伙伴可以点我一下官方去看文档
            File f=new File("D:/img.png");
            BufferedImage image=ImageIO.read(f);
            BinaryBitmap bb=new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
            HashMap map =new HashMap();
            map.put(EncodeHintType.CHARACTER_SET, "utf-8");
            Result result = reader.decode(bb,map);
            System.out.println("解析结果："+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 (NotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

解析结果：www.baidu.com
二维码格式类型：QR_CODE
二维码文本内容：www.baidu.com