taglib标签库详解

<script type="text/javascript" src="http://ads.auctionads.com/pagead/show_ads.js"></script>  一、定义标签文件(web.xml)
<taglib>
  <taglib-uri>/tags/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>

二、引用标签文件(jsp文件)
<%@ taglib uri="/tags/struts-logic" prefix="logic"  %>

三、标签文件说明(struts-logic.tld)
(1)empty标签
类名：org.apache.struts.taglib.logic.EmptyTag
标签体：bodycontent=JSP
引用logic:empty
属性  attribute:name,property,scope
功能：判断对象的值是否为空

(2)equal
类名：org.apache.struts.taglib.logic.EqualTag
标签体：bodycontent=JSP
引用logic:equal
属性  attribute:cookie,header,name,parameter,property,scope,value
功能：等于比较符

(3) forward
org.apache.struts.taglib.logic.ForwardTag  
标签体：bodycontent=empty
引用logic:forward
属性  attribute:name
功能：页面导向，查找配置文件的全局forward

(4) greaterEqual
类名：org.apache.struts.taglib.logic.GreaterEqualTag
标签体：bodycontent=JSP
引用logic:greaterEqual
属性  attribute:cookie,header,name,parameter,property,scope,value
功能：大于等于比较符

(5)greaterThan
类名：org.apache.struts.taglib.logic.GreaterThanTag
标签体：bodycontent=JSP
引用logic:greaterThan
属性  attribute:cookie,header,name,parameter,property,scope,value
功能：大于比较符

(6) iterator
类名：org.apache.struts.taglib.logic.IterateTag
标签体：bodycontent=JSP
引用logic:iterator
属性  attribute:collection,id,indexId,length,name,offset,property,scope,type
功能：显示列表为collection的值（List ,ArrayList,HashMap等）

(7)lessEqual
类名org.apache.struts.taglib.logic.LessEqualTag
标签体：bodycontent=JSP
logic:lessEqual
属性  attribute:cookie,header,name,parameter,property,scope,value
功能：小于等于比较符

(8)lessThan
类名：org.apache.struts.taglib.logic.LessThanTag
标签体：bodycontent=JSP
logic:lessThan
属性  attribute:cookie,header,name,parameter,property,scope,value
功能：小于比较符

(9)match
类名：org.apache.struts.taglib.logic.MatchTag
标签体：bodycontent=JSP
引用logic:match
属性  attribute:cookie,header,location,name,parameter,property,scope,value
功能：比较对象

(10)messagesNotPresent
类名：org.apache.struts.taglib.logic.MessagesNotPresentTag
标签：bodycontent=JSP
引用logic:messagesNotPresent
属性  attribute:name,property,message
功能：ActionMessages/ActionErrors对象是否不存在

(11)messagePresent
类名：org.apache.struts.taglib.logic.MessagesPresentTag
标签：bodycontent=JSP
引用logic:messagePresent
属性  attribute:name,property,message
功能：ActionMessages/ActionErrors对象是否不存在

(12)notEmpty
类名：org.apache.struts.taglib.logic.NotEmptyTag
标签：bodycontent=JSP
引用logic:notEmpty
属性  attribute:name,property,scope
功能：比较对象是否不为空

(13)notEqual
类名：org.apache.struts.taglib.logic.NotEqualTag
标签：bodycontent=JSP
引用logic:notEqual
属性  attribute:cookie,header,name,parameter,property,scope,value

(14)notMatch
类名：org.apache.struts.taglib.logic.NotMatchTag
标签：bodycontent=JSP
引用logic:notMatch
属性  attribute:cookie,header,location,name,parameter,property,scope,value
功能：比较对象是否不相等

(15)notPresent
类名：org.apache.struts.taglib.logic.NotPresentTag
标签：bodycontent=JSP
引用logic:notPresent
属性 attribute:cookie,header,name,parameter,property,role,scope,user
功能：request对象传递参数是否不存在

(16)present
类名:org.apache.struts.taglib.logic.PresentTag
标签：bodycontent=JSP
引用logic:present
属性  attribute:cookie,header,name,parameter,property,role,scope,user
功能：request对象传递参数是否存在

(17)redirect
类名：org.apache.struts.taglib.logic.RedirectTag
标签：bodycontent=JSP
引用logic:redirect
属性  attribute:anchor,forward,href,name,page,paramId,paramName,paramProperty,paramScope,property,scope,transaction
功能；页面转向，可传递参数 <script type="text/javascript" src="http://ads.auctionads.com/pagead/show_ads.js"></script>