goja-web/src/main/java/goja/mvc/render/ftl/kit/DirectiveKit.java
public static TemplateDirectiveBodyOverrideWraper getOverrideBody(Environment env, String name)
            throws TemplateModelException {
        return (TemplateDirectiveBodyOverrideWraper)
                env.getVariable(DirectiveKit.getOverrideVariableName(name));
    }
public static TemplateDirectiveBodyOverrideWraper getOverrideBody(Environment env, String name)
            throws TemplateModelException {
        return (TemplateDirectiveBodyOverrideWraper)
                env.getVariable(DirectiveKit.getOverrideVariableName(name));
    }
从Freemarker的运行环境中，取得指定名称的覆盖内容渲染器

@param env  运行环境
@param name 指定名称
@return 覆盖内容渲染器
@throws freemarker.template.TemplateModelException 模板模型异常