feat(HBaseEmpManager): 统计培训课程的参与人数

- 新增 countTrainingParticipants 方法，用于统计培训课程的参与人数
- 通过 Scan 操作扫描表中的 training_courses 列
- 使用 HashMap 统计每个课程的参与人数
- 打印每个课程的参与人数统计结果

src/main/java/HBaseEmpManager.java

@@ -178,4 +178,28 @@ public class HBaseEmpManager {
         System.out.println("Most Recently Promoted Employee: " + latestEmp + ", Promotion Date: " + latestDate);
         table.close();
     }
+
+    // 统计培训课程的参与人数
+    private static void countTrainingParticipants() throws IOException {
+        Table table = connection.getTable(TableName.valueOf(TABLE_NAME));
+        Scan scan = new Scan();
+        scan.addColumn(Bytes.toBytes(CF_TRAINING), Bytes.toBytes("training_courses"));
+
+        ResultScanner scanner = table.getScanner(scan);
+        Map<String, Integer> countMap = new HashMap<>();
+
+        for (Result result : scanner) {
+            String courses = Bytes.toString(result.getValue(Bytes.toBytes(CF_TRAINING), Bytes.toBytes("training_courses")));
+            for (String course : courses.split(", ")) {
+                countMap.put(course, countMap.getOrDefault(course, 0) + 1);
+            }
+        }
+
+        System.out.println("培训课程统计:");
+        for (Map.Entry<String, Integer> entry : countMap.entrySet()) {
+            System.out.println(entry.getKey() + ": " + entry.getValue() + " 人");
+        }
+
+        table.close();
+    }
 }