SpringBoot 使用 zxing 生成二维码 返回Base64编码

第一种：https://blog.csdn.net/weixin_33835103/article/details/86783010

 

第二种：（有问题，打包时，报程序包不存在）：

转载：https://blog.csdn.net/kioo_i_see/article/details/82775097

先看整体效果：

生成的二维码数据：

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADIAQAAAACFI5MzAAAAp0lEQVR42u3YwQ6AIAwD0P7/T1cD WxlB75TAReFxWYBKBP8aruwh6K291J6tRGFvt/ScBW0wBZpiLppxhpDVnSUjo8u6R80kskF1Lhni JVN0f2a8lyj5WBPdWPJcYSrdVtqYwlwLaCtZaYz11bOW2IKR4OMa5CnaeshlJJxF2c3xoLOUYKBm OUs5W9qTBwiobxRPkDnKjeUj0p1FN9WslXCW+09oY3kAFgd8LVjedlIAAAAASUVORK5CYII=

前端页面显示：

代码：

    com.google.zxing
    core
    3.3.3


    com.google.zxing
    javase
    3.3.3

1.

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.sun.org.apache.xml.internal.security.utils.Base64;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;


import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;

/**
 * @description:
 * @author: Administrator
 * @date: 2019-03-18 10:40
 */
@Service
public class QRCodeService {

    public String crateQRCode(String content, int width, int height) throws IOException {

        String resultImage = "";
        if (!StringUtils.isEmpty(content)) {
            ServletOutputStream stream = null;
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            @SuppressWarnings("rawtypes")
            HashMap hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 指定字符编码为“utf-8”
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); // 指定二维码的纠错等级为中级
            hints.put(EncodeHintType.MARGIN, 2); // 设置图片的边距

            try {
                QRCodeWriter writer = new QRCodeWriter();
                BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);

                BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
                ImageIO.write(bufferedImage, "png", os);
                /**
                 * 原生转码前面没有 data:image/png;base64 这些字段，返回给前端是无法被解析，可以让前端加，也可以在下面加上
                 */
                resultImage = new String("data:image/png;base64," + Base64.encode(os.toByteArray()));

                return resultImage;
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (stream != null) {
                    stream.flush();
                    stream.close();
                }
            }
        }
        return null;
    }
}
2.

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

/**
 * @description: 二维码功能相关
 * @author: Administrator
 * @date: 2019-03-18 10:13
 */
@RestController
@RequestMapping("/qrcode")
public class QRCodeController {

    @Autowired
    QRCodeService qrCodeService;

    @RequestMapping(value="/getQRCode")
    public String getQRCode() throws IOException {
        //return qrCodeService.crateQRCode("http://xxx/xx.html",200,200);
        return qrCodeService.crateQRCode("this is qrcode",200,200);
    }

}

3.浏览器打开：http://localhost:8902/qrcode

把生成的base64数据复制到 http://imgbase64.duoshitong.com/ 或类似在线的Base64转图片的网站进行图片转换