fix: 修复编译错误

core/core-backend/src/main/java/io/dataease/visualization/utils/VisualizationUtils.java

@@ -0,0 +1,27 @@
+package io.dataease.visualization.utils;
+
+
+import io.dataease.extensions.view.dto.ChartViewDTO;
+import io.dataease.utils.JsonUtil;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class VisualizationUtils {
+
+   public static Map<Long,String> viewTransToStr(Map<Long, ChartViewDTO> source ){
+       Map<Long,String> result = new HashMap<>();
+       source.forEach((key,value) ->{
+           result.put(key, (String)JsonUtil.toJSONString(value));
+       });
+       return result;
+    }
+
+    public static Map<Long,ChartViewDTO> viewTransToObj (Map<Long, String> source ){
+        Map<Long,ChartViewDTO> result = new HashMap<>();
+        source.forEach((key,value) ->{
+            result.put(key, JsonUtil.parseObject(value,ChartViewDTO.class));
+        });
+        return result;
+    }
+}