修改了资源路径1

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

@@ -18,6 +18,7 @@ import java.text.SimpleDateFormat;
 import java.io.File;
 import java.util.Date;
 import java.util.Objects;
+import org.springframework.core.io.ClassPathResource;
 
 @Service
 public class CertService  {
@@ -34,7 +35,7 @@ public class CertService  {
     ){
         try {
             // 加载背景模板图片
-            BufferedImage background = ImageIO.read(new File("static/cert/template.png"));
+            BufferedImage background = ImageIO.read(new ClassPathResource("static/cert/template.png").getInputStream());
 
             Graphics2D g2d = (Graphics2D) background.getGraphics();
             g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

src/main/java/com/example/caseData/utils/ImageUtil.java

@@ -1,19 +1,22 @@
 package com.example.caseData.utils;
 
-import java.io.File;
+import org.springframework.core.io.ClassPathResource;
-import java.io.FileInputStream;
+
-import java.io.IOException;
+import java.io.*;
 
 public class ImageUtil {
     public static byte[] readImageToBytes(String imagePath) throws IOException {
-        File file = new File(imagePath);
+        ClassPathResource resource = new ClassPathResource(imagePath);
-        try (FileInputStream fis = new FileInputStream(file)) {
+        try (InputStream inputStream = resource.getInputStream();
-            byte[] bytes = new byte[(int) file.length()];
+             ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
-            int read = fis.read(bytes);
+
-            if (read != bytes.length) {
+            byte[] buffer = new byte[1024];
-                throw new IOException("读取文件长度不一致");
+            int bytesRead;
+            while ((bytesRead = inputStream.read(buffer)) != -1) {
+                outputStream.write(buffer, 0, bytesRead);
             }
-            return bytes;
+
+            return outputStream.toByteArray();
         }
     }
 }