官方文档 iterator的所有例子 自己找找The following example retrieves the value of the getDays() method of the current object on the value stack and uses it to iterate over. The <s:property/> tag prints out the current value of the iterator.<s:iterator value="days"> <p>day is: <s:property/></p> </s:iterator>The following example uses a Bean tag and places it into the ActionContext. The iterator tag will retrieve that object from the ActionContext and then calls its getDays() method as above. The status attribute is also used to create an IteratorStatus object, which in this example, its odd() method is used to alternate row colours:<s:bean name="org.apache.struts2.example.IteratorExample" var="it"> <s:param name="day" value="'foo'"/> <s:param name="day" value="'bar'"/> </s:bean> <p/> <table border="0" cellspacing="0" cellpadding="1"> <tr> <th>Days of the week</th> </tr> <p/> <s:iterator value="#it.days" status="rowstatus"> <tr> <s:if test="#rowstatus.odd == true"> <td style="background: grey"><s:property/></td> </s:if> <s:else> <td><s:property/></td> </s:else> </tr> </s:iterator> </table>The next example will further demonstrate the use of the status attribute, using a DAO obtained from the action class through OGNL, iterating over groups and their users (in a security context). The last() method indicates if the current object is the last available in the iteration, and if not, we need to separate the users using a comma:<s:iterator value="groupDao.groups" status="groupStatus"> <tr class="<s:if test="#groupStatus.odd == true ">odd</s:if><s:else>even</s:else>"> <td><s:property value="name" /></td> <td><s:property value="description" /></td> <td> <s:iterator value="users" status="userStatus"> <s:property value="fullName" /><s:if test="!#userStatus.last">,</s:if> </s:iterator> </td> </tr> </s:iterator>The next example iterates over a an action collection and passes every iterator value to another action. The trick here lies in the use of the '[0]' operator. It takes the current iterator value and passes it on to the edit action. Using the '[0]' operator has the same effect as using <s:property />. (The latter, however, does not work from inside the param tag).<s:action name="entries" var="entries"/> <s:iterator value="#entries.entries" > <s:property value="name" /> <s:property /> <s:push value="..."> <s:action name="edit" var="edit" > <s:param name="entry" value="[0]" /> </s:action> </push> </s:iterator>To simulate a simple loop with iterator tag, the following could be done. It does the loop 5 times.<s:iterator status="stat" value="{1,2,3,4,5}" > <!-- grab the index (start with 0 ... ) --> <s:property value="#stat.index" /> <!-- grab the top of the stack which should be the --> <!-- current iteration value (1, ... 5) --> <s:property value="top" /> </s:iterator>Another way to create a simple loop, similar to JSTL's <c:forEach begin="..." end="..." ...> is to use some OGNL magic, which provides some under-the-covers magic to make 0-n loops trivial. This example also loops five times.<s:iterator status="stat" value="(5).{ #this }" > <s:property value="#stat.count" /> <!-- Note that "count" is 1-based, "index" is 0-based. --> </s:iterator>
自己找找The following example retrieves the value of the getDays() method of the current object on the value stack and uses it to iterate over. The <s:property/> tag prints out the current value of the iterator.<s:iterator value="days">
<p>day is: <s:property/></p>
</s:iterator>The following example uses a Bean tag and places it into the ActionContext. The iterator tag will retrieve that object from the ActionContext and then calls its getDays() method as above. The status attribute is also used to create an IteratorStatus object, which in this example, its odd() method is used to alternate row colours:<s:bean name="org.apache.struts2.example.IteratorExample" var="it">
<s:param name="day" value="'foo'"/>
<s:param name="day" value="'bar'"/>
</s:bean>
<p/>
<table border="0" cellspacing="0" cellpadding="1">
<tr>
<th>Days of the week</th>
</tr>
<p/>
<s:iterator value="#it.days" status="rowstatus">
<tr>
<s:if test="#rowstatus.odd == true">
<td style="background: grey"><s:property/></td>
</s:if>
<s:else>
<td><s:property/></td>
</s:else>
</tr>
</s:iterator>
</table>The next example will further demonstrate the use of the status attribute, using a DAO obtained from the action class through OGNL, iterating over groups and their users (in a security context). The last() method indicates if the current object is the last available in the iteration, and if not, we need to separate the users using a comma:<s:iterator value="groupDao.groups" status="groupStatus">
<tr class="<s:if test="#groupStatus.odd == true ">odd</s:if><s:else>even</s:else>">
<td><s:property value="name" /></td>
<td><s:property value="description" /></td>
<td>
<s:iterator value="users" status="userStatus">
<s:property value="fullName" /><s:if test="!#userStatus.last">,</s:if>
</s:iterator>
</td>
</tr>
</s:iterator>The next example iterates over a an action collection and passes every iterator value to another action. The trick here lies in the use of the '[0]' operator. It takes the current iterator value and passes it on to the edit action. Using the '[0]' operator has the same effect as using <s:property />. (The latter, however, does not work from inside the param tag).<s:action name="entries" var="entries"/>
<s:iterator value="#entries.entries" >
<s:property value="name" />
<s:property />
<s:push value="...">
<s:action name="edit" var="edit" >
<s:param name="entry" value="[0]" />
</s:action>
</push>
</s:iterator>To simulate a simple loop with iterator tag, the following could be done. It does the loop 5 times.<s:iterator status="stat" value="{1,2,3,4,5}" >
<!-- grab the index (start with 0 ... ) -->
<s:property value="#stat.index" /> <!-- grab the top of the stack which should be the -->
<!-- current iteration value (1, ... 5) -->
<s:property value="top" />
</s:iterator>Another way to create a simple loop, similar to JSTL's <c:forEach begin="..." end="..." ...> is to use some OGNL magic, which provides some under-the-covers magic to make 0-n loops trivial. This example also loops five times.<s:iterator status="stat" value="(5).{ #this }" >
<s:property value="#stat.count" /> <!-- Note that "count" is 1-based, "index" is 0-based. -->
</s:iterator>
<s:if test="userInfo.user_province=='<s:property/>'">
上句是action传过来的省份(userInfo.user_province) 与<s:property/> (是迭代的值，就是<s:iterator> value的值) <option selected="selected">
<s:property value="userInfo.user_province"/>
</option>
上句的意思是相等则为默认选中action传过来的省份(userInfo.user_province)的值
</s:if>
<s:else>
<option>
<s:property/>
</option>
但现在就是在页面显示<s:else>里的值，没有和action传过来的值匹配，匹配该怎么写呢？
查了很多资料，都没有很好的解决办法？望贵人指点。。
用这种方式也不行：<s:if test="userInfo.user_province==\"<s:property/>\"">
因为是字符串。
改成： <s:if test="userInfo.user_province==top">