用beetl自定义标签，需要注入一个service，但是注入的结果是null,这个该咋搞

@IocBean
public class DictTag extends GeneralVarTagBinding {
	String style,dictType;
	String type = "checkbox";

	@Inject
	MacroService macroService;

	private void init() {
		style = (String)getAttributeValue("style");
		dictType = (String)getAttributeValue("dictType");
		type = (String)getAttributeValue("type");
	}

	@Override
	public void render() {
		init();
		List<Macro> list = macroService.listByDictType(dictType);
		System.out.println(list.size());
	}

}

貌似上面写的是@IocBean不行。。