struts2中的s:iterator是不是只有通过action才能取到数据?
我直接通过业务层就像jstl<c:foreach>那样可以取到数据吗?
我直接通过业务层就像jstl<c:foreach>那样可以取到数据吗?
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不过s:iterator能取到数据 <c:foreach>也能
s:iterator数据可以通过action的ActionForward转过来
<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>
直接调用业务层的数据查询方法改如何做呢?
业务层里面不可以,除非你业务层继承了ActionSupport,其实你action里面调用业务层不就搞定了,我的是这么实现的
>_<
我是直接请求的jsp页面,我现在尝试着在页面调用service层方法(和使用JSTL一样)
然后把list放到request里,然后在iterator里通过OGNL调用