实现排行榜页面

2023-03-10 23:50:10 +08:00
parent baf5f897b3
commit cb8d9f4e3e
4 changed files with 198 additions and 2 deletions
@@ -0,0 +1,23 @@
+package com.kob.backend.controller.ranklist;
+
+import com.alibaba.fastjson2.JSONObject;
+import com.kob.backend.service.ranklist.GetRankListService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+@RestController
+public class GetRankListController {
+    @Autowired
+    private GetRankListService getRankListService;
+
+    @GetMapping("/ranklist/getranklist/")
+    JSONObject getRankList(@RequestParam Map<String, String> data) {
+        Integer page = Integer.parseInt(data.get("page_index"));
+        Integer.parseInt(data.get("page_index"));
+        return getRankListService.getRankList(page);
+    }
+}
@@ -0,0 +1,47 @@
+package com.kob.backend.service.impl.ranklist;
+
+import com.alibaba.fastjson2.JSONObject;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.kob.backend.mapper.UserMapper;
+import com.kob.backend.pojo.Record;
+import com.kob.backend.pojo.User;
+import com.kob.backend.service.ranklist.GetRankListService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.LinkedList;
+import java.util.List;
+
+@Service
+public class GetRankListServiceImpl implements GetRankListService {
+    @Autowired
+    private UserMapper userMapper;
+
+    @Override
+    public JSONObject getRankList(Integer page) {
+        // 使用 Mybatis API : IPage 实现
+        IPage<User> rankListIPage = new Page<>(page, 10);    // 参数列表:Page<>(传第几页, 每一页有多少项目)
+        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
+        queryWrapper.orderByDesc("rating"); // 通过 User 的 rating (积分从高到低)降序排序
+        List<User> users = userMapper.selectPage(rankListIPage, queryWrapper).getRecords();
+
+        JSONObject resp = new JSONObject();
+        // 对数据进行预处理,发送数据包之前,先过滤掉用户的密码信息
+        List<JSONObject> processed_users = new LinkedList<>();
+        for (User user : users) { // 枚举用户排行
+            // 将枚举到的玩家的头像,用户名和积分进行绑定
+            JSONObject processed_user = new JSONObject();
+            processed_user.put("id", user.getId());
+            processed_user.put("photo", user.getPhoto());
+            processed_user.put("username", user.getUsername());
+            processed_user.put("rating", user.getRating());
+            // 将 jsonObject 对象 processed_user,添加到 processed_users 列表中
+            processed_users.add(processed_user);
+        }
+        resp.put("users", processed_users);  // 将处理后的用户信息重新打包起来
+        resp.put("user_count", userMapper.selectCount(null));  // 存入当前记录页面的总数, null 表示全部存入
+        return resp;
+    }
+}
@@ -0,0 +1,8 @@
+// 排行榜接口
+package com.kob.backend.service.ranklist;
+
+import com.alibaba.fastjson2.JSONObject;
+
+public interface GetRankListService {
+    JSONObject getRankList(Integer page);
+}