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src/main/java/com/example/caseData/service/CertService.java

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+package com.example.caseData.service;
+
+import com.example.caseData.exception.BusinessException;
+import com.example.caseData.extend.aliyun.Oss;
+import org.springframework.stereotype.Service;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.geom.Ellipse2D;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.io.File;
+import java.util.Date;
+
+@Service
+public class CertService  {
+    // 生成证书
+    public String createCert(String avatarPath,
+                             String sealPath,
+                             String certificateNo,
+                             String name,
+                             String content){
+        try {
+            // 加载背景模板图片
+            BufferedImage background = ImageIO.read(new File("src/main/resources/static/cert/template.png"));
+
+            Graphics2D g2d = (Graphics2D) background.getGraphics();
+            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+
+            // 设置字体
+            Font font = new Font("Arial", Font.PLAIN, 24);
+            g2d.setFont(font);
+
+            // 1. 添加证书编号
+            g2d.drawString(certificateNo, 180, 294);
+
+            // 2. 处理并添加头像
+            BufferedImage avatar = ImageIO.read(new File(avatarPath));
+            int size = 100; // 目标大小
+            BufferedImage circleAvatar = createCircularImage(avatar, size);
+            g2d.drawImage(circleAvatar, 290, 380, null);
+
+            // 3. 添加姓名
+            g2d.drawString(name, 330, 524);
+
+            // 4. 添加证书内容
+            g2d.drawString(content, 120, 574);
+
+            // 5. 添加日期
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
+            String currentDate = sdf.format(new Date());
+            g2d.drawString(currentDate, 390, 874);
+
+            // 6. 添加印章
+            BufferedImage seal = ImageIO.read(new File(sealPath));
+            seal = resize(seal, 100, 100); // 调整印章大小
+            g2d.drawImage(seal, 300, 750, null);
+
+            // 释放资源
+            g2d.dispose();
+
+            // === 将图片转为 byte[] ===
+//            ByteArrayOutputStream os = new ByteArrayOutputStream();
+//            ImageIO.write(background, "png", os);
+//            byte[] imageBytes = os.toByteArray();
+//            String fileName = "dev/static/images/" + "测试" + ".png";
+//            boolean uploaded = Oss.putObject(fileName, imageBytes);
+//            if (uploaded) {
+//                // 返回可访问的 URL（假设你有自定义域名）
+//                // 格式：http://你的域名/文件名
+//                return fileName;
+//            }
+
+//            // 保存最终的证书图片
+            ImageIO.write(background, "png", new File("cert.png"));
+            System.out.println("Certificate generated successfully!");
+        } catch (IOException e) {
+            throw new BusinessException(e.getMessage());
+        }
+
+        return null;
+    }
+
+    private static BufferedImage createCircularImage(BufferedImage originalImg, int size) {
+        BufferedImage outputImage = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g2 = outputImage.createGraphics();
+        g2.setComposite(AlphaComposite.Src);
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+        g2.setColor(Color.WHITE);
+        g2.fill(new Ellipse2D.Float(0, 0, size, size));
+        g2.setComposite(AlphaComposite.SrcAtop);
+        g2.drawImage(originalImg.getScaledInstance(size, size, Image.SCALE_SMOOTH), 0, 0, null);
+        g2.dispose();
+        return outputImage;
+    }
+
+    private static BufferedImage resize(BufferedImage img, int newW, int newH) {
+        Image tmp = img.getScaledInstance(newW, newH, Image.SCALE_SMOOTH);
+        BufferedImage dimg = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g2d = dimg.createGraphics();
+        g2d.drawImage(tmp, 0, 0, null);
+        g2d.dispose();
+        return dimg;
+    }
+
+}