引入pom

		<!--二维码依赖--><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.3.3</version></dependency><dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.3.3</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.28</version><scope>provided</scope></dependency>

核心方法

    private static final int QRCODE_SIZE = 320; // 二维码尺寸，宽度和高度均是320private static final String FORMAT_TYPE = "PNG"; // 二维码图片类型/*** 获取二维码图片** @param dataStr    二维码内容* @param needLogo   是否需要添加logo* @param bottomText 底部文字       为空则不显示* @return*/@SneakyThrowspublic static BufferedImage getQRCodeImage(String dataStr, boolean needLogo, String bottomText) {if (dataStr == null) {throw new RuntimeException("未包含任何信息");}HashMap<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    //定义内容字符集的编码hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);        //定义纠错等级hints.put(EncodeHintType.MARGIN, 1);QRCodeWriter qrCodeWriter = new QRCodeWriter();BitMatrix bitMatrix = qrCodeWriter.encode(dataStr, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);int width = bitMatrix.getWidth();int height = bitMatrix.getHeight();int tempHeight = height;if (StringUtils.hasText(bottomText)) {tempHeight = tempHeight + 12;}BufferedImage image = new BufferedImage(width, tempHeight, BufferedImage.TYPE_INT_RGB);for (int x = 0; x < width; x++) {for (int y = 0; y < height; y++) {image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);}}// 判断是否添加logoif (needLogo) {insertLogoImage(image);}// 判断是否添加底部文字if (StringUtils.hasText(bottomText)) {addFontImage(image, bottomText);}return image;}/*** 插入logo图片** @param source 二维码图片* @throws Exception*/private static void insertLogoImage(BufferedImage source) throws Exception {// 默认logo放于resource/static/目录下ClassPathResource classPathResource = new ClassPathResource("static/xbk.jpg");InputStream inputStream = classPathResource.getInputStream();if (inputStream == null || inputStream.available() == 0) {return;}Image src = ImageIO.read(inputStream);int width = 30;int height = 30;Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(image, 0, 0, null); // 绘制缩小后的图g.dispose();src = image;// 插入LOGOGraphics2D graph = source.createGraphics();int x = (QRCODE_SIZE - width) / 2;int y = (QRCODE_SIZE - height) / 2;graph.drawImage(src, x, y, width, height, null);Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);graph.setStroke(new BasicStroke(3f));graph.draw(shape);graph.dispose();}private static void addFontImage(BufferedImage source, String declareText) {//生成imageint defineWidth = QRCODE_SIZE;int defineHeight = 20;BufferedImage textImage = new BufferedImage(defineWidth, defineHeight, BufferedImage.TYPE_INT_RGB);Graphics2D g2 = (Graphics2D) textImage.getGraphics();//开启文字抗锯齿g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,   RenderingHints.VALUE_TEXT_ANTIALIAS_ON);g2.setBackground(Color.WHITE);g2.clearRect(0, 0, defineWidth, defineHeight);g2.setPaint(Color.BLACK);FontRenderContext context = g2.getFontRenderContext();//部署linux需要注意 linux无此字体会显示方块,传入null选择默认字体Font font = new Font(null, Font.BOLD, 15);g2.setFont(font);LineMetrics lineMetrics = font.getLineMetrics(declareText, context);FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);float offset = (defineWidth - fontMetrics.stringWidth(declareText)) / 2;float y = (defineHeight + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;g2.drawString(declareText, (int) offset, (int) y);Graphics2D graph = source.createGraphics();//开启文字抗锯齿graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,   RenderingHints.VALUE_TEXT_ANTIALIAS_ON);//添加imageint width = textImage.getWidth(null);int height = textImage.getHeight(null);Image src = textImage;graph.drawImage(src, 0, QRCODE_SIZE - 8, width, height, Color.WHITE, null);graph.dispose();}

其中logo图片存放的路径为：resource/static/
在这里插入图片描述

调用

import lombok.SneakyThrows;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import sun.misc.BASE64Encoder;import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;@Controller
@RequestMapping("/qrcode")
public class QrCodeController {//1、生成带logo和底部文字得二维码@SneakyThrows@GetMapping("/getQrCode1")public void getQrCode1(HttpServletResponse response) {String content="test";String bottomTxt="01";ServletOutputStream os = response.getOutputStream();BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,true,bottomTxt);response.setContentType("image/png");ImageIO.write(bufferedImage,"png",os);}//2、生成不带logo和带底部文字的二维码@SneakyThrows@GetMapping("/getQrCode2")public void getQrCode2(HttpServletResponse response) {String content="test";ServletOutputStream os = response.getOutputStream();BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,null);response.setContentType("image/png");ImageIO.write(bufferedImage,"png",os);}//3、生成默认带logo不带底部文字得二维码@SneakyThrows@GetMapping("/getQrCode3")public void getQrCode3(HttpServletResponse response) {String content="test";ServletOutputStream os = response.getOutputStream();BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,true,null);response.setContentType("image/png");ImageIO.write(bufferedImage,"png",os);}//3、生成不带logo带底部文字得二维码@SneakyThrows@GetMapping("/getQrCode4")public void getQrCode4(HttpServletResponse response) {String content="test";String bottomTxt="01";ServletOutputStream os = response.getOutputStream();BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,bottomTxt);response.setContentType("image/png");ImageIO.write(bufferedImage,"png",os);}//5、生成不带logo带底部文字的二维码，返回base64@SneakyThrows@GetMapping("/getQrCode5")@ResponseBodypublic Object getQrCode5() {String content="test";String bottomTxt="01";BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,bottomTxt);ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流ImageIO.write(bufferedImage, "png", baos);//写入流中byte[] bytes = baos.toByteArray();//转换成字节BASE64Encoder encoder = new BASE64Encoder();String png_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\nString generateQrCode="data:image/jpg;base64," + png_base64;Map<String,String> map = new HashMap<>();map.put("generateQrCode",generateQrCode);return map;}}