修复编译问题

src/main/java/com/tptj/demo/hg/export/operate/provider/JsonExporter.java

@@ -36,7 +36,7 @@ public class JsonExporter extends BaseAppExporter {
         writer.print( rt.toString() );
         writer.close();
     }
-
+    @SuppressWarnings("unchecked")
     private JSONObject sheet2Json( ResultECReport sheet,String name,int idx ) throws Exception {
         JSONObject jo_sheet = JSONObject.create().put("name",name).put("idx",idx);
         JSONArray ja_cells = JSONArray.create();