热门推荐 API，随机推荐四本书。

book-server/src/main/java/com/book/server/controller/BookController.java

@@ -10,6 +10,7 @@ import com.book.server.model.VO.BookRes;
 import com.book.server.model.VO.Chapter;
 import com.book.server.model.VO.QueryVO;
 import com.book.server.service.BookService;
+import com.mysql.cj.QueryBindings;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.cache.annotation.CacheEvict;
@@ -17,6 +18,7 @@ import org.springframework.cache.annotation.Cacheable;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -53,6 +55,21 @@ public class BookController extends BaseController {
         return Result.success(bookService.recommendByRead(queryVO));
     }
 
+    /**
+     * 热门推荐4个
+     * @param queryVO
+     * @return
+     */
+    @PostMapping("/topRecommend")
+    public Result<List<Book>> topRecommend(@RequestBody QueryVO queryVO) {
+        queryVO.setPage(0);
+        queryVO.setSize(10);
+        queryVO.setPageId(queryVO.getSex()); // 为了复用recommendByRead的代码
+        List<Book> books = bookService.recommendByRead(queryVO);
+        Collections.shuffle(books);
+        return Result.success(books.subList(0, 4));
+    }
+
     /**
      * 书城block
      *