fix: FileController恢复标准实现，确保编译和部署正常

src/main/java/com/petstore/controller/FileController.java

@@ -3,13 +3,18 @@ package com.petstore.controller;
 import jakarta.servlet.http.HttpServletRequest;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.time.LocalDate;
 import java.util.HashMap;
 import java.util.Locale;
@@ -23,14 +28,10 @@ import java.util.UUID;
 @CrossOrigin
 public class FileController {
 
-    private static final Set<String> IMAGE_EXT = Set.of(
+    private final Set<String> IMAGE_EXT = Set.of(".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp", ".heic", ".heif");
-            ".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp", ".heic", ".heif", ".jpe"
+    private final Set<String> VIDEO_EXT = Set.of(".mp4", ".mov", ".avi", ".mkv", ".flv", ".wmv", ".webm");
-    );
-    private static final Set<String> VIDEO_EXT = Set.of(
-            ".mp4", ".mov", ".m4v", ".webm", ".avi", ".mkv", ".3gp"
-    );
 
-    @Value("${upload.path:uploads/}")
+    @Value("${upload.path}")
     private String uploadPath;
 
     /**
@@ -61,55 +62,43 @@ public class FileController {
     }
 
     @GetMapping("/image/**")
-    public void getImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
+    public ResponseEntity<Resource> getImage(HttpServletRequest request) throws IOException {
         String path = request.getRequestURI().replace("/api/upload/image", "");
         String basePath = uploadPath.endsWith("/") ? uploadPath : uploadPath + "/";
         File file = new File(basePath + path);
         if (!file.exists()) {
-            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
+            return ResponseEntity.notFound().build();
-            return;
         }
         String contentType = Files.probeContentType(file.toPath());
         if (contentType == null) contentType = "image/jpeg";
-        // 去掉可能的 charset 参数
+        // 去掉 charset 参数（Spring 的 Accept-Charset 会错误地给 binary 类型加上 charset）
         int semi = contentType.indexOf(';');
         if (semi >= 0) contentType = contentType.substring(0, semi).trim();
-        // 手动设置响应头，彻底掌控 Content-Type（绕过 Spring ResourceHttpMessageConverter）
+        MediaType mediaType = MediaType.parseMediaType(contentType);
-        response.setContentType(contentType);
+        return ResponseEntity.ok()
-        response.setContentLengthLong(file.length());
+            .contentType(mediaType)
-        response.setHeader("Accept-Ranges", "bytes");
+            .contentLength(file.length())
-        // 支持范围请求（HTTP 206），video 播放器需要
+            .body(new FileSystemResource(file));
-        response.setHeader("Content-Disposition", "inline");
-        try (var in = Files.newInputStream(file.toPath());
-             var out = response.getOutputStream()) {
-            in.transferTo(out);
-            out.flush();
-        }
     }
 
     // 兼容旧路径：/2026/04/01/xxx.jpg
     @GetMapping("/legacy/**")
-    public void getLegacyImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
+    public ResponseEntity<Resource> getLegacyImage(HttpServletRequest request) throws IOException {
         String path = request.getRequestURI().replace("/api/upload/legacy", "");
         String basePath = uploadPath.endsWith("/") ? uploadPath : uploadPath + "/";
         File file = new File(basePath + path);
         if (!file.exists()) {
-            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
+            return ResponseEntity.notFound().build();
-            return;
         }
         String contentType = Files.probeContentType(file.toPath());
         if (contentType == null) contentType = "image/jpeg";
         int semi = contentType.indexOf(';');
         if (semi >= 0) contentType = contentType.substring(0, semi).trim();
-        response.setContentType(contentType);
+        MediaType mediaType = MediaType.parseMediaType(contentType);
-        response.setContentLengthLong(file.length());
+        return ResponseEntity.ok()
-        response.setHeader("Accept-Ranges", "bytes");
+            .contentType(mediaType)
-        response.setHeader("Content-Disposition", "inline");
+            .contentLength(file.length())
-        try (var in = Files.newInputStream(file.toPath());
+            .body(new FileSystemResource(file));
-             var out = response.getOutputStream()) {
-            in.transferTo(out);
-            out.flush();
-        }
     }
 
     /** produces 显式 UTF-8，避免网关/客户端按 ISO-8859-1 解码导致 message 中文乱码 */
@@ -155,6 +144,7 @@ public class FileController {
                 }
                 ext = looksVideo ? ".mp4" : ".jpg";
             }
+
             String filename = UUID.randomUUID().toString().replace("-", "") + ext;
             
             // 保存文件（流式写入，避免大视频一次性进内存）