struts1的几个对象---哪位大哥帮忙解释下

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@page import="org.apache.struts.action.ActionMessages"%>
<%@page import="org.apache.struts.action.ActionErrors"%>
<%@page import="org.apache.struts.Globals"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic"%>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
<head>
	<html:base />
	<title>ok.jsp</title>
</head>
<body>
	ActionMessages.GLOBAL_MESSAGE:<%=ActionMessages.GLOBAL_MESSAGE%><br />
	ActionErrors.GLOBAL_MESSAGE:<%=ActionErrors.GLOBAL_MESSAGE%><br />
	Globals.MESSAGE_KEY:<%=Globals.MESSAGE_KEY%><br />
	Globals.ERROR_KEY:<%=Globals.ERROR_KEY%><br />
</body>
</html:html>

 

显示的结果: 

ActionMessages.GLOBAL_MESSAGE:org.apache.struts.action.GLOBAL_MESSAGE

ActionErrors.GLOBAL_MESSAGE:org.apache.struts.action.GLOBAL_MESSAGE
Globals.MESSAGE_KEY:org.apache.struts.action.ACTION_MESSAGE
Globals.ERROR_KEY:org.apache.struts.action.ERROR

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