推荐规则的导入的问题修复

backend-java/src/main/java/com/pharmacopoeia/controller/AdminKnowledgeController.java

@@ -289,8 +289,10 @@ public class AdminKnowledgeController {
         try {
             String csv = new String(file.getBytes(), StandardCharsets.UTF_8);
             return ResponseEntity.ok(brandRecommendService.importBrandsCsv(csv));
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.badRequest().body(Map.of("ok", false, "message", e.getMessage()));
         } catch (Exception e) {
-            return ResponseEntity.ok(Map.of("ok", false, "message", e.getMessage()));
+            return ResponseEntity.internalServerError().body(Map.of("ok", false, "message", e.getMessage()));
         }
     }
 
@@ -354,8 +356,10 @@ public class AdminKnowledgeController {
         try {
             String csv = new String(file.getBytes(), StandardCharsets.UTF_8);
             return ResponseEntity.ok(brandRecommendService.importRulesCsv(csv));
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.badRequest().body(Map.of("ok", false, "message", e.getMessage()));
         } catch (Exception e) {
-            return ResponseEntity.ok(Map.of("ok", false, "message", e.getMessage()));
+            return ResponseEntity.internalServerError().body(Map.of("ok", false, "message", e.getMessage()));
         }
     }
 

backend-java/src/main/java/com/pharmacopoeia/service/BrandRecommendService.java

@@ -490,6 +490,10 @@ public class BrandRecommendService {
      *  Newlines inside "..." quoted fields do NOT split rows. */
     private static List<String[]> parseCsv(String csv) {
         List<String[]> rows = new ArrayList<>();
+        // Strip UTF-8 BOM if present (Excel adds it when saving UTF-8 CSV)
+        if (csv.startsWith("")) {
+            csv = csv.substring(1);
+        }
         csv = csv.replace("\r\n", "\n").replace("\r", "\n");
 
         // Split into logical lines: \n inside a quoted field stays part of the cell value
@@ -611,22 +615,20 @@ public class BrandRecommendService {
     }
 
     private static String str(Map<String, Object> body, String key) {
-        return Optional.ofNullable(body.get(key))
-                .map(Object::toString).map(String::trim)
-                .filter(s -> !s.isEmpty())
-                .orElse(null);
+        Object value = body.get(key);
+        if (value == null) {
+            return null;
+        }
+        String s = value.toString().trim();
+        return s.isEmpty() ? "" : s;
     }
 
     private static String nullToEmpty(String s) { return s != null ? s : ""; }
 
     private static void applyStr(Map<String, Object> body, String key, Consumer<String> setter) {
-        Optional.ofNullable(body.get(key))
-                .ifPresent(v -> {
-                    String s = v.toString().trim();
-                    if (!s.isEmpty()) {
-                        setter.accept(s);
-                    }
-                });
+        if (body.containsKey(key)) {
+            setter.accept(str(body, key));
+        }
     }
 
     private static String cell(String[] cols, Map<String, Integer> colIdx, String header) {