现在有一个beanpublic class SamBean {
private List<Category> cate;
private Map<Category,Item> items;
}其他涉及的类有:
public class Category implements java.io.Serializable {
private Integer categoryId;
private String categoryName;
}public class Item implements java.io.Serializable {
private Integer itemId;
private String itemName;
private Integer categoryId;
}
以上都省略了getter和setter
经过填充值,list和map里都有数据了,跳转到显示页面,在页面上用strut2标签输出时
<body>
<s:iterator value="#samBean.cate" id="cat">
<table class="flex">
<tr>
<th>
<s:property value="categoryName" />
</th>
</tr>
<s:iterator value="#samBean.items" id="it">
<s:if test="#it.key==#cat">
<tr>
<td>
<s:property value="#it.value"/><!-- 这里可以输出item对象的toString() -->
<s:property value="value.itemName" /><!-- 看不到这个值 --> </td>
</tr>
</s:if>
</s:iterator>
</table>
</s:iterator>
</body>我想看到枚举的每个map里面的Item对象的属性,怎么实现?
private List<Category> cate;
private Map<Category,Item> items;
}其他涉及的类有:
public class Category implements java.io.Serializable {
private Integer categoryId;
private String categoryName;
}public class Item implements java.io.Serializable {
private Integer itemId;
private String itemName;
private Integer categoryId;
}
以上都省略了getter和setter
经过填充值,list和map里都有数据了,跳转到显示页面,在页面上用strut2标签输出时
<body>
<s:iterator value="#samBean.cate" id="cat">
<table class="flex">
<tr>
<th>
<s:property value="categoryName" />
</th>
</tr>
<s:iterator value="#samBean.items" id="it">
<s:if test="#it.key==#cat">
<tr>
<td>
<s:property value="#it.value"/><!-- 这里可以输出item对象的toString() -->
<s:property value="value.itemName" /><!-- 看不到这个值 --> </td>
</tr>
</s:if>
</s:iterator>
</table>
</s:iterator>
</body>我想看到枚举的每个map里面的Item对象的属性,怎么实现?
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试试
这样想的。
还有这里:
<s:iterator value="#samBean.cate" id="cat">
我觉得可以不要#的。
也可以这样
<s:iterator value="#samBean.cate" id="cat">
<table class="flex">
<tr>
<th>
<s:property value="categoryName" />
</th>
</tr>
<s:iterator value="#samBean.items" id="it">
<s:if test="%{#it.key.categoryId==categoryId}">
<tr>
<td>
<s:property value="#it.value.itemName"/>
</td>
</tr>
</s:if>
</s:iterator>
</table>
</s:iterator>
<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:iterator value="#samBean.cate" id="cat">
<table class="flex" width="1000px" align="center">
<tr>
<th colspan="3">
<s:property value="categoryName" />
</th>
</tr>
<s:set id="item" value="#samBean.items.get(#cat)"></s:set>
<s:iterator value="#item">
<tr>
<td width="20%" align="center">
<img src="${icon}">
</td>
<td width="50%">
<a href="aaa?id=${id}"><s:property value="name" /></a>
<br/><br/>
<s:property value="description" />
</td>
<td width="30%" align="center">
<s:property value="managernames" />
</td>
</tr>
</s:iterator>
</table>
<br/>
</s:iterator>