feat: 新增DashboardController统计接口

src/main/java/edu/situ/stlserver/controller/DashboardController.java

@@ -0,0 +1,85 @@
+package edu.situ.stlserver.controller;
+
+import edu.situ.stlserver.model.vo.HttpResult;
+import edu.situ.stlserver.service.CourseService;
+import edu.situ.stlserver.service.CoachService;
+import edu.situ.stlserver.service.MemberService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/dashboard")
+public class DashboardController {
+
+    @Autowired
+    private CoachService coachService;
+
+    @Autowired
+    private MemberService memberService;
+
+    @Autowired
+    private CourseService courseService;
+
+    @GetMapping("/stats")
+    public HttpResult getStats() {
+        Map<String, Object> stats = new HashMap<>();
+        // 教练总数
+        stats.put("coachCount", coachService.getAll().size());
+        // 会员总数
+        stats.put("memberCount", memberService.getAll().size());
+        // 课程总数
+        stats.put("courseCount", courseService.getAll().size());
+        // 在职教练数
+        long activeCoachCount = coachService.getAll().stream()
+                .filter(c -> c.getQuitDate() == null)
+                .count();
+        stats.put("activeCoachCount", activeCoachCount);
+        // 有效会员数
+        long activeMemberCount = memberService.getAll().stream()
+                .filter(m -> m.getExpireDate() == null)
+                .count();
+        stats.put("activeMemberCount", activeMemberCount);
+        // 进行中课程数
+        long activeCourseCount = courseService.getAll().stream()
+                .filter(c -> "进行中".equals(c.getStatus()))
+                .count();
+        stats.put("activeCourseCount", activeCourseCount);
+        return HttpResult.success(stats);
+    }
+
+    @GetMapping("/member-level")
+    public HttpResult getMemberLevel() {
+        Map<String, Long> levelMap = new HashMap<>();
+        levelMap.put("钻石", memberService.getAll().stream().filter(m -> "钻石".equals(m.getLevel())).count());
+        levelMap.put("金卡", memberService.getAll().stream().filter(m -> "金卡".equals(m.getLevel())).count());
+        levelMap.put("银卡", memberService.getAll().stream().filter(m -> "银卡".equals(m.getLevel())).count());
+        levelMap.put("普通", memberService.getAll().stream().filter(m -> "普通".equals(m.getLevel())).count());
+        return HttpResult.success(levelMap);
+    }
+
+    @GetMapping("/course-type")
+    public HttpResult getCourseType() {
+        Map<String, Long> typeMap = new HashMap<>();
+        courseService.getAll().forEach(c -> {
+            typeMap.merge(c.getType(), 1L, Long::sum);
+        });
+        return HttpResult.success(typeMap);
+    }
+
+    @GetMapping("/member-trend")
+    public HttpResult getMemberTrend() {
+        Map<String, Long> trendMap = new HashMap<>();
+        memberService.getAll().forEach(m -> {
+            String month = m.getJoinDate().substring(0, 7); // yyyy-MM
+            trendMap.merge(month, 1L, Long::sum);
+        });
+        // 按月份排序
+        Map<String, Long> sortedMap = new java.util.TreeMap<>(trendMap);
+        return HttpResult.success(sortedMap);
+    }
+}