添加图表数据展示功能

- 后端新增/chart-data接口用于获取图表所需数据
- 实现近6个月出入库金额统计和药品分类占比功能
- 前端集成echarts图表组件展示数据可视化
- 添加月度出入库柱状图和药品分类饼图
- 优化仪表盘界面布局和样式

backend/src/main/java/com/kronecker/backend/controller/DashboardController.java

@@ -28,4 +28,9 @@ public class DashboardController {
                                               @RequestParam(defaultValue = "10") Integer size) {
         return Result.success(dashboardService.getExpiryWarning(new Page<>(page, size)));
     }
+
+    @GetMapping("/chart-data")
+    public Result<Map<String, Object>> chartData() {
+        return Result.success(dashboardService.getChartData());
+    }
 }

backend/src/main/java/com/kronecker/backend/service/DashboardService.java

@@ -5,10 +5,13 @@ import com.kronecker.backend.entity.Stock;
 import com.kronecker.backend.entity.StockInRecord;
 import com.kronecker.backend.entity.StockOutRecord;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import java.util.List;
+import java.util.Map;
 
 public interface DashboardService {
-    java.util.Map<String, Object> getStatistics();
+    Map<String, Object> getStatistics();
     Page<Stock> getExpiryWarning(Page<Stock> page);
     Page<StockInRecord> getRecentStockIn(Page<StockInRecord> page);
     Page<StockOutRecord> getRecentStockOut(Page<StockOutRecord> page);
+    Map<String, Object> getChartData();
 }

backend/src/main/java/com/kronecker/backend/service/impl/DashboardServiceImpl.java

@@ -4,6 +4,8 @@ import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.kronecker.backend.entity.*;
 import com.kronecker.backend.mapper.*;
+import com.kronecker.backend.entity.*;
+import com.kronecker.backend.mapper.*;
 import com.kronecker.backend.service.DashboardService;
 import com.kronecker.backend.utils.RedisCacheService;
 import lombok.RequiredArgsConstructor;
@@ -17,6 +19,7 @@ import java.util.*;
 public class DashboardServiceImpl implements DashboardService {
 
     private final MedicineMapper medicineMapper;
+    private final MedicineCategoryMapper medicineCategoryMapper;
     private final StockMapper stockMapper;
     private final StockInRecordMapper stockInRecordMapper;
     private final StockOutRecordMapper stockOutRecordMapper;
@@ -97,4 +100,50 @@ public class DashboardServiceImpl implements DashboardService {
             records.forEach(r -> { if (r.getCustomerId() != null) r.setCustomerName(custMap.getOrDefault(r.getCustomerId(), "")); });
         }
     }
+
+    @Override
+    public Map<String, Object> getChartData() {
+        Map<String, Object> data = new HashMap<>();
+
+        // 近6个月出入库金额统计
+        List<Map<String, Object>> monthlyStats = new ArrayList<>();
+        for (int i = 5; i >= 0; i--) {
+            String month = LocalDate.now().minusMonths(i).format(java.time.format.DateTimeFormatter.ofPattern("yyyy-MM"));
+            Double inAmount = stockInRecordMapper.selectList(new LambdaQueryWrapper<StockInRecord>()
+                    .eq(StockInRecord::getStatus, 1)
+                    .likeRight(StockInRecord::getInDate, month))
+                    .stream().mapToDouble(r -> r.getTotalAmount().doubleValue()).sum();
+            Double outAmount = stockOutRecordMapper.selectList(new LambdaQueryWrapper<StockOutRecord>()
+                    .eq(StockOutRecord::getStatus, 1)
+                    .likeRight(StockOutRecord::getOutDate, month))
+                    .stream().mapToDouble(r -> r.getTotalAmount().doubleValue()).sum();
+            Map<String, Object> m = new HashMap<>();
+            m.put("month", month);
+            m.put("inAmount", Math.round(inAmount * 100.0) / 100.0);
+            m.put("outAmount", Math.round(outAmount * 100.0) / 100.0);
+            monthlyStats.add(m);
+        }
+        data.put("monthlyStats", monthlyStats);
+
+        // 药品分类库存占比
+        List<Map<String, Object>> categoryStats = new ArrayList<>();
+        List<MedicineCategory> categories = medicineCategoryMapper.selectList(null);
+        for (MedicineCategory cat : categories) {
+            int count = medicineMapper.selectCount(new LambdaQueryWrapper<Medicine>().eq(Medicine::getCategoryId, cat.getId())).intValue();
+            if (count > 0) {
+                Map<String, Object> cs = new HashMap<>();
+                cs.put("name", cat.getName());
+                cs.put("value", count);
+                categoryStats.add(cs);
+            }
+        }
+        data.put("categoryStats", categoryStats);
+
+        // 库存总价值
+        double totalStockValue = stockMapper.selectList(new LambdaQueryWrapper<Stock>().gt(Stock::getQuantity, 0))
+                .stream().mapToDouble(s -> s.getCostPrice().doubleValue() * s.getQuantity()).sum();
+        data.put("totalStockValue", Math.round(totalStockValue * 100.0) / 100.0);
+
+        return data;
+    }
 }