初始提交，未完全测试

template/expr/ast/FieldKit.py

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+#!/usr/bin/env python3.9
+# -*- coding: utf-8 -*-
+"""
+JFinal FieldKit - Field Access Utilities
+"""
+
+class FieldKit:
+    """Field access utilities"""
+    
+    @staticmethod
+    def get_field(obj, field_name: str):
+        """
+        Get field value from object
+        
+        Args:
+            obj: Object to get field from
+            field_name: Field name
+            
+        Returns:
+            Field value or None
+        """
+        if obj is None:
+            return None
+        
+        # Try attribute access
+        if hasattr(obj, field_name):
+            return getattr(obj, field_name)
+        
+        # Try dictionary access
+        if isinstance(obj, dict) and field_name in obj:
+            return obj[field_name]
+        
+        return None
+    
+    @staticmethod
+    def set_field(obj, field_name: str, value):
+        """
+        Set field value on object
+        
+        Args:
+            obj: Object to set field on
+            field_name: Field name
+            value: Value to set
+            
+        Returns:
+            True if successful, False otherwise
+        """
+        if obj is None:
+            return False
+        
+        # Try attribute access
+        if hasattr(obj, field_name):
+            setattr(obj, field_name, value)
+            return True
+        
+        # Try dictionary access
+        if isinstance(obj, dict):
+            obj[field_name] = value
+            return True
+        
+        return False
+    
+    def __repr__(self) -> str:
+        return "FieldKit()"