java生成二维码（在图片上生成二维码（二维码带logo）并且在图片上添加文字标签）

1pom.xml

<!--生成二维码-->
<dependency>
   <groupId>cn.hutool</groupId>
   <artifactId>hutool-extra</artifactId>
   <version>5.4.3</version>
</dependency>
<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>core</artifactId>
   <version>3.3.3</version>
</dependency>

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2.工具类

package com.example.QRcode.utils;

import cn.hutool.extra.qrcode.QrCodeUtil;
import cn.hutool.extra.qrcode.QrConfig;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.ResourceUtils;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

/**
 * @Description: 在图片上生成二维码并且在图片上添加文字response前端
 * @Auther: yjj
 * @Date: 2020/9/23 18:57
 */
public class QRcodeImageFont {

    /***
     * 在一张背景图上添加二维码
     */
    public static void drawString(String content, HttpServletResponse response) throws Exception {
        BufferedImage image = addWater(content);
        Graphics2D gd = image.createGraphics();
        // 3、设置对线段的锯齿状边缘处理
        gd.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        // 5、设置水印文字颜色
        gd.setColor(Color.red);
        // 6、设置水印文字Font
        gd.setFont(new Font("宋体", Font.BOLD, 20));
        // 8、第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)
        gd.drawString("测试文字", 90, 260);
        gd.dispose();
        // 输出图片
        ServletOutputStream outputStream = response.getOutputStream();
        ImageIO.write(image, "png",outputStream );
        System.out.println("添加水印完成");
        outputStream.flush();
        outputStream.close();
    }

    /***
     * 在一张背景图上添加二维码
     */
    public static BufferedImage addWater(String content) throws Exception {
        // 读取原图片信息
        //得到文件
        File file = ResourceUtils.getFile("classpath:static/img/code.png");
        //文件转化为图片
        Image srcImg = ImageIO.read(file);
        //获取图片的宽
        int srcImgWidth = srcImg.getWidth(null);
        //获取图片的高
        int srcImgHeight = srcImg.getHeight(null);
        // 加水印
        BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bufImg.createGraphics();
        g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
        //使用工具类生成二维码
        Image image = createQrCode(content,200,200);
        //将小图片绘到大图片上,500,300 .表示你的小图片在大图片上的位置。
        g.drawImage(image, 70, 300, null);
        //设置颜色。
        g.setColor(Color.WHITE);
        g.dispose();
        return bufImg;
    }

    private static BufferedImage createQrCode(String content, int width, int height) throws IOException {
        QrConfig config = new QrConfig(width, height);

        Image image = ImageIO.read(resourceLoader("classpath:static/img/onlyLogo.png"));
        config.setImg(image);
        config.setErrorCorrection(ErrorCorrectionLevel.H);
        return QrCodeUtil.generate(
                content,
                config);
    }

    public static InputStream resourceLoader(String fileFullPath) throws IOException {
        ResourceLoader resourceLoader = new DefaultResourceLoader();
        return resourceLoader.getResource(fileFullPath).getInputStream();
    }
}

3.底图和logo

4.测试

package com.example.QRcode.controller;

import com.example.QRcode.utils.QRcodeImageFont;
import com.example.QRcode.utils.QRcodeImageUtils;
import com.example.QRcode.utils.QRcodeUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;

/**
 * @Description:
 * @Auther: yjj
 * @Date: 2020/9/23 18:58
 */
@RestController
@RequestMapping(value = "/test")
public class TestController {

    @GetMapping("/createQrCode")
    public void createQrCode(@RequestParam("url") String url, HttpServletResponse response) throws Exception {
       
        //在图片上生成二维码，并在图片上添加文字描述
        QRcodeImageFont.drawString(url,response);
    }
}

5.展示