PropertyMessageResources实现本地化
public org.apache.struts.util.PropertyMessageResources extends org.apache.struts.util.MessageResources

//获得资源文件内容
PropertyMessageResources resources = (PropertyMessageResources)request.getAttribute(Globals.MESSAGES_KEY);
//获得本地
Locale locale = request.getLocale();
//根据本地信息获得需要的资源
String value = resources.getMessage(locale, "app.label.keyXXX")

System.out.println(value);