R isError and isSuccess static

ruoyi-common/src/main/java/com/ruoyi/common/core/domain/R.java

@@ -103,13 +103,13 @@ public class R<T> implements Serializable
         this.data = data;
     }
 
-    public Boolean isError()
+    public static <T> Boolean isError(R<T> ret)
     {
-        return !isSuccess();
+        return !isSuccess(ret);
     }
 
-    public Boolean isSuccess()
+    public static <T> Boolean isSuccess(R<T> ret)
     {
-        return R.SUCCESS == getCode();
+        return R.SUCCESS == ret.getCode();
     }
 }

ruoyi-common/src/main/java/com/ruoyi/common/utils/poi/ExcelUtil.java

@@ -694,17 +694,19 @@ public class ExcelUtil<T>
             // 得到导出对象.
             T vo = (T) list.get(i);
             Collection<?> subList = null;
-            if (isSubListValue(vo))
-            {
-                subList = getListCellValue(vo);
-                subMergedLastRowNum = subMergedLastRowNum + subList.size();
-            }
-            else
+            if (isSubList())
             {
-                subMergedFirstRowNum++;
-                subMergedLastRowNum++;
+                if (isSubListValue(vo))
+                {
+                    subList = getListCellValue(vo);
+                    subMergedLastRowNum = subMergedLastRowNum + subList.size();
+                }
+                else
+                {
+                    subMergedFirstRowNum++;
+                    subMergedLastRowNum++;
+                }
             }
-
             int column = 0;
             for (Object[] os : fields)
             {