JAVA两种简单生成二维码

最下面是纯二维码
配置pom文件

<!-- 二维码工具类 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.2.0</version>
        </dependency>

创建工具类

第一种方式

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;

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


    //生成二维码
public class CreateQRCode {
    
    
    public static void main(String[] args) {
    
    

        int width = 300;        //定义图片宽度
        int height = 300;       //定义图片高度
        String format = "png";      //定义图片格式
        String content = "https://blog.csdn.net/weixin_45537947";     //定义二维码内容

        //定义二维码的参数
        HashMap hashMap = new HashMap();
        hashMap.put(EncodeHintType.CHARACTER_SET, "utf-8");     //设置编码
        hashMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);       //设置容错等级，等级越高，容量越小
        hashMap.put(EncodeHintType.MARGIN, 2);          //设置边距
        //生成二维码
        try {
    
    
            //生成矩阵
            //                                                   内容              格式          宽       高
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hashMap);
            Path file = new File("F:/img.png").toPath();        //设置路径
            MatrixToImageWriter.writeToPath(bitMatrix, format, file);       //输出图像
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }
}

第二种方式

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;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class QrCodeUtil {
    
    

    public static byte[] createQRCode(int width, int height, String content) throws WriterException, IOException {
    
    
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();

        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 设置编码字符集utf-8

        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 设置纠错等级L/M/Q/H,纠错等级越高越不易识别，当前设置等级为最高等级H

        hints.put(EncodeHintType.MARGIN, 0);// 可设置范围为0-10，但仅四个变化0 1(2) 3(4 5 6) 7(8 9 10)
        // 生成图片类型为QRCode
        BarcodeFormat format = BarcodeFormat.QR_CODE;

        // 创建位矩阵对象
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, format, width, height, hints);
        ByteArrayOutputStream os = new ByteArrayOutputStream();

        MatrixToImageWriter.writeToStream(bitMatrix, "png", os);

        return os.toByteArray();
         }

    public static void main(String[] args) throws WriterException, IOException {
    
    

        byte[] b = createQRCode(100, 100, "遇见最好的自己！");
        OutputStream os = new FileOutputStream("E:\\bestme.png");

        os.write(b);

         os.close();

        }
    }