springboot生成二維碼到海報模板上

QRCodeController

package com.ruoyi.web.controller.app;import com.google.zxing.WriterException;
import com.ruoyi.app.domain.Opportunity;
import com.ruoyi.app.tool.QRCodeGenerator;
import com.ruoyi.common.core.page.TableDataInfo;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.Map;@RestController
@RequestMapping("/app/qrcCode")
@Api(tags = "推廣海報接口")
public class QRCodeController {@Autowiredprivate QRCodeGenerator qrCodeGenerator;@ApiOperation(value = "獲取推廣海報", notes = "獲取推廣海報")@GetMapping("/qrImage")public void generateQRCode(HttpServletResponse response, @RequestParam Map<String, String> params) throws Exception {String openid = params.get("openid");String xh = params.get("xh");if (openid == null || openid.isEmpty()) {throw new Exception("openid不能為空");}if (xh == null || xh.isEmpty()) {xh = "1";}// 改為自己的鏈接String url = "http://*******.cn/app/index/?parentId=" + openid;byte[] qrCodeBytes = qrCodeGenerator.generateQRCode(url, 290, 290, xh);response.setContentType(MediaType.IMAGE_PNG_VALUE);response.setHeader("Content-Disposition", "inline; filename=qrCode.png");response.setHeader("Cache-Control", "no-store");response.setHeader("Pragma", "no-cache");response.setContentLength(qrCodeBytes.length);try (OutputStream out = response.getOutputStream()) {out.write(qrCodeBytes);}}
}

QRCodeGenerator

package com.ruoyi.app.tool;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Component;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@Component
public class QRCodeGenerator {public byte[] generateQRCode(String url, int qrCodeWidth, int qrCodeHeight, String xh) throws WriterException, IOException {// 生成二維碼QRCodeWriter qrCodeWriter = new QRCodeWriter();Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 設置容錯級別為高BitMatrix bitMatrix = qrCodeWriter.encode(url, BarcodeFormat.QR_CODE, qrCodeWidth, qrCodeHeight, hints);BufferedImage qrCodeImage = bitMatrixToImage(bitMatrix);// 加載背景圖片ClassPathResource backgroundImageResource = new ClassPathResource("static/" + xh + ".jpg");BufferedImage backgroundImage = ImageIO.read(backgroundImageResource.getInputStream());// 創建包含背景圖片的畫布int combinedImageWidth = backgroundImage.getWidth();int combinedImageHeight = backgroundImage.getHeight();BufferedImage combinedImage = new BufferedImage(combinedImageWidth, combinedImageHeight, BufferedImage.TYPE_INT_RGB);Graphics2D combinedGraphics = combinedImage.createGraphics();combinedGraphics.drawImage(backgroundImage, 0, 0, null);// 將二維碼放在背景圖的左下角int qrCodeX = 930; // 二維碼在背景圖片中的X坐標int qrCodeY = combinedImageHeight - qrCodeHeight - 20; // 二維碼在背景圖片中的Y坐標// 添加紅色邊框int borderWidth = 2; // 邊框寬度Color borderColor = Color.decode("#B11E4C"); // 邊框顏色combinedGraphics.setColor(new Color(borderColor.getRed(), borderColor.getGreen(), borderColor.getBlue(), 0)); // 設置填充顏色為透明色combinedGraphics.fillRoundRect(qrCodeX - borderWidth, qrCodeY - borderWidth, qrCodeWidth + 2 * borderWidth, qrCodeHeight + 2 * borderWidth, 5, 5);combinedGraphics.setColor(borderColor); // 設置邊框顏色combinedGraphics.drawRoundRect(qrCodeX - borderWidth, qrCodeY - borderWidth, qrCodeWidth + 2 * borderWidth, qrCodeHeight + 2 * borderWidth, 5, 5); // 繪制邊框combinedGraphics.drawImage(qrCodeImage, qrCodeX, qrCodeY, null);// 將合成的圖片轉為字節數組ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();ImageIO.write(combinedImage, "png", byteArrayOutputStream);return byteArrayOutputStream.toByteArray();}private BufferedImage bitMatrixToImage(BitMatrix bitMatrix) {int width = bitMatrix.getWidth();int height = bitMatrix.getHeight();BufferedImage image = new BufferedImage(width, height, 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) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());}}return image;}
}

海報模板存放（不帶二維碼的圖片）：

把地址放到白名單中，無需token可以訪問，然后就得到：