@IocBean
public class DictTag extends GeneralVarTagBinding {
	String name,value,style,dictType;
	String type = "checkbox";
	StringBuffer sb = new StringBuffer();
	
	@Inject
	MacroService macroService;

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

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

这里会报空指针异常，没有找到marcoService ,而下面这样写就是对的

public class DictTag extends GeneralVarTagBinding {
	String name,value,style,dictType;
	String type = "checkbox";
	StringBuffer sb = new StringBuffer();
	MacroService macroService;

	private void init() {
		Ioc ioc = Mvcs.getIoc();
		name = (String)getAttributeValue("name");
		value = (String)getAttributeValue("value");
		style = (String)getAttributeValue("style");
		dictType = (String)getAttributeValue("dictType");
		type = (String)getAttributeValue("type");
		macroService = ioc.get(MacroService.class);
	}

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