http://www.blogjava.net/bulktree/archive/2008/04/02/190257.html
最近做毕业设计用到Struts2 的标签库，遇到一些比较复杂的数据显示，个人还是比较喜欢用tag显示的，Struts2 tags内容丰富，但是所提供的文档不是很详细（个人认为）在showcase下的例子如:<s:select /> <s:doubleselect /> <s:updownselect /> <s:optiontransferselect />等都是一些简单的值显示，在实际的开发中并没有那么简单，如果我们要迭代显示List、Map、Set里的值，我们该怎样做呢？
看看html里的例子，
<select name="sex">
<option value="man">男</option>
<option value="women">女</option>
</select>
Sex表示提交的name，man/women是对应页面显示提交后所代表的值，男/女则为页面最终看到的值
而如果我们要显示一个List集合里的数据该怎么做呢？
看下面的Jsp页面：
<select name="department">
<%
Department department = null;
List list = (List) request.getAttribute("list");
Iterator iter = list.iterator();
while (iter.hasNext()) {
department = (Department) iter.next();
%>
<option value="<%=department.getDep_name() %>"><%=department.getDep_name()%> </option>
<%
}
%>
</select>
迭代的是Department的属性dep_name,这样显示显得很麻烦，如果Iterator输出可能会好点,采用JSTL输出：
<c:forEach var="department" items="" varStatus="status">
<tr>
<td>${status.dep_name }</td>
<td>${status.dep_id }</td>
<td>......</td>
</tr>
</c:forEach>
现在看看Struts2的例子：
这是Strust2 showcase例子
<%@ page c%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Test</title>
</head>
<body>
<center><br>
<br>
<br>
<hr>
<br>
<br>
<s:form action="test_showPost" method="post" theme="simple">
<table>
<tr>
<td><s:select
list="{'Windows','Linux','Java','.net','Pertl','PHP'}"
name="program" tooltip="select your program" /></td>
</tr>
<tr>
<td><s:select list="posts" name="post.post_name"
listKey="post_name" listValue="post_name" headerKey="0"
headerValue="请选择你的职位" required="true"></s:select></td>
</tr>
<tr>
<td><s:checkboxlist name="skills1" label="Skills 1"
tooltip="bulktree" list="{'Java', '.Net', 'RoR', 'PHP' }"
value="{'Java', '.Net' }" /></td>
</tr>
<tr>
<td><s:checkboxlist name="skills2" label="Skills 2"
tooltip="bulktree" list="#{1:'Java', 2:'.Net', 3:'RoR', 4:'PHP' }"
listKey="key" listValue="value" value="{1, 2, 3 }" /></td>
</tr>
<tr>
<td><s:doubleselect label="doubleselect test1" name="menu"
list="{'fruit','other'}" doubleName="dishes"
doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" />
</td>
</tr>
<tr>
<td><s:updownselect label="Favourite Countries"
list="#{'england':'England', 'america':'America', 'germany':'Germany'}"
name="prioritisedFavouriteCountries" headerKey="-1"
headerValue="--- Please Order Them Accordingly ---"
emptyOption="true" /></td>
</tr>
<tr>
<td><s:optiontransferselect
tooltip="Select Your Favourite Cartoon Characters"
label="Favourite Cartoons Characters"
name="leftSideCartoonCharacters" leftTitle="Left Title"
rightTitle="Right Title" list="{'Popeye', 'He-Man', 'Spiderman'}"
multiple="true" headerKey="headerKey"
headerValue="--- Please Select ---" emptyOption="true"
doubleList="{'Superman', 'Mickey Mouse', 'Donald Duck'}"
doubleName="rightSideCartoonCharacters"
doubleHeaderKey="doubleHeaderKey"
doubleHeaderValue="--- Please Select ---" doubleEmptyOption="true"
doubleMultiple="true" /></td>
</tr>
<tr>
<td><s:submit></s:submit></td>
</tr>
</table>
</s:form></center>
</body>
</html>
