code: public static Writer renderFromStr(String templateContent, Map<String, Object> bindingMap, Writer writer) {
  		return render(getStrTemplate(templateContent), bindingMap, writer);
  	}
docs: 渲染模板
  
  @param templateContent 模板内容
  @param bindingMap 绑定参数
  @param writer {@link Writer} 渲染后写入的目标Writer
  @return {@link Writer}