套题分类按首字母排序

src/main/java/com/project/classicpaper/application/impl/ClassicCategoryApplicationServiceImpl.java

@@ -15,6 +15,7 @@ import com.project.classicpaper.domain.service.ClassicPaperSetBaseService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.text.Collator;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -29,11 +30,11 @@ public class ClassicCategoryApplicationServiceImpl implements ClassicCategoryApp
 
     @Override
     public Result<List<ClassicCategoryDTO>> treeList(Boolean withPaperSet) {
-        // 1. 查所有分类 → DTO
-        List<ClassicCategoryDTO> list = classicCategoryBaseService.list(
-                new LambdaQueryWrapper<ClassicCategoryEntity>().orderByAsc(ClassicCategoryEntity::getSort)
-        ).stream().map(entity -> entity.toDTO(ClassicCategoryDTO::new))
+        // 1. 查所有分类 → DTO（Java 中排序）
+        List<ClassicCategoryDTO> list = classicCategoryBaseService.list()
+                .stream().map(entity -> entity.toDTO(ClassicCategoryDTO::new))
                 .collect(Collectors.toList());
+        list.sort(this::compareByName);
 
         // 2. 构建树
         List<ClassicCategoryDTO> tree = TreeUtils.buildLongTree(list,
@@ -69,6 +70,46 @@ public class ClassicCategoryApplicationServiceImpl implements ClassicCategoryApp
         return Result.success(tree);
     }
 
+    /**
+     * 按名称排序规则：
+     * - 中文 → 按拼音首字母（使用 java Collator）
+     * - 英文 → 按字母顺序
+     * - 其他 → 按 ID
+     */
+    private int compareByName(ClassicCategoryDTO a, ClassicCategoryDTO b) {
+        String nameA = a.getName();
+        String nameB = b.getName();
+        int typeA = getCharType(nameA);
+        int typeB = getCharType(nameB);
+        if (typeA != typeB) {
+            return Integer.compare(typeA, typeB);
+        }
+        if (typeA == 0) {
+            return Collator.getInstance(Locale.CHINESE).compare(
+                    nameA != null ? nameA : "",
+                    nameB != null ? nameB : "");
+        } else if (typeA == 1) {
+            String safeA = nameA != null ? nameA : "";
+            String safeB = nameB != null ? nameB : "";
+            return safeA.compareToIgnoreCase(safeB);
+        } else {
+            return Long.compare(
+                    a.getId() != null ? a.getId() : 0L,
+                    b.getId() != null ? b.getId() : 0L);
+        }
+    }
+
+    /**
+     * 判断首字符类型：0-中文，1-英文，2-其他
+     */
+    private int getCharType(String name) {
+        if (name == null || name.isEmpty()) return 2;
+        char first = name.charAt(0);
+        if (first >= '一' && first <= '鿿') return 0;
+        if ((first >= 'A' && first <= 'Z') || (first >= 'a' && first <= 'z')) return 1;
+        return 2;
+    }
+
     /**
      * 递归注入 paperSetCount：
      * 二级节点取直接统计值，一级节点累加子节点