common 包，基础组件

src/main/java/cn/iocoder/dashboard/util/collection/MapUtils.java

@@ -0,0 +1,29 @@
+package cn.iocoder.dashboard.util.collection;
+
+import cn.hutool.core.collection.CollectionUtil;
+import com.google.common.collect.Multimap;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Map 工具类
+ *
+ * @author 芋道源码
+ */
+public class MapUtils {
+
+    public static <K, V> List<V> getList(Multimap<K, V> multimap, Collection<K> keys) {
+        List<V> result = new ArrayList<>();
+        keys.forEach(k -> {
+            Collection<V> values = multimap.get(k);
+            if (CollectionUtil.isEmpty(values)) {
+                return;
+            }
+            result.addAll(values);
+        });
+        return result;
+    }
+
+}