Struts2学习之路（七）—— Struts2标签

1.如何使用Strut2标签库的标签？

在JSP页面的源码顶部中加入代码

<%@ taglib uri="/struts-tags" prefix="s"  %>

2.标签分类及使用：

（1）属性标签

a)控制标签

• if
• elseif
• else
• append
• generator
• iterator
• merge
• sort
• subset

示例代码：

I. if elseif else

<s:if test="%{false}">
    <div>Will Not Be Executed</div>
</s:if>
<s:elseif test="%{true}">
    <div>Will Be Executed</div>
</s:elseif>
<s:else>
    <div>Will Not Be Executed</div>
</s:else>

II. sort

<!-- 示例1 -->
<s:sort comparator="myComparator" source="myList">
     <s:iterator>
     <!-- do something with each sorted elements -->
     <s:property value="..." />
     </s:iterator>
</s:sort>

<!-- 示例2 -->
<s:sort var="mySortedList" comparator="myComparator" source="myList" />

<%
   Iterator sortedIterator = (Iterator) pageContext.getAttribute("mySortedList");
   for (Iterator i = sortedIterator; i.hasNext(); ) {
     // do something with each of the sorted elements
   }
%>

b)数据标签

• a
• action
• bean
• date
• debug
• i18n
• include
• param
• property
• push
• set
• text
• url

示例代码：

I. a

<s:url var="testUrlId" namespace="/subscriber" action="customField" method="delete">
    <s:param name="customFieldDefinition.id" value="${id}"/>
</s:url>
<s:a errorText="Sorry your request had an error." preInvokeJS="confirm(‘Are you sure you want to delete this item?‘)" href="%{testUrlId}">
    <img src="<s:url value="/images/delete.gif"/>" border="none"/>
</s:a>

<img xsrc="<s:url value="/images/delete.gif"/>" border="none"/><s:a><img xsrc="<s:url value="/images/delete.gif"/>" border="none"/></s:a>

II. bean

<-- in freemarker form -->
[@s.bean name="org.apache.struts2.example.counter.SimpleCounter" var="counter"]
  [s:param name="foo" value="BAR"/]
  The value of foo is : [s:property value="foo"/], when inside the bean tag.<br />
[/s:bean]

<-- in jsp form -->
<s:bean name="org.apache.struts2.example.counter.SimpleCounter" var="counter">
  <s:param name="foo" value="BAR" />
  The value of foot is : <s:property value="foo"/>, when inside the bean tag <br />
</s:bean>

III. i18n

<s:i18n name="myCustomBundle">
   The i18n value for key aaa.bbb.ccc in myCustomBundle is <s:property value="text(‘aaa.bbb.ccc‘)" />
</s:i18n>

VI. textfield

<s:textfield name="lastName" label="<s:text name="person.lastName"/>" ../>

（2）UI标签

a）表格标签

• checkbox
• checkboxlist
• combobox
• datetextfield
• doubleselect
• head
• file
• form
• hidden
• inputtransferselect
• label
• optiontransferselect
• optgroup
• password
• radio
• reset
• select
• submit
• textarea
• textfield
• token
• updownselect

b）非表格标签

• actionerror
• actionmessage
• component
• div
• fielderror

c）Ajax标签

• a
• autocompleter
• bind
• datetimepicker
• div
• head
• submit
• tabbedPanel
• textarea
• tree
• treenode