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<a name="navskip"></a><td height="25" colspan="4"><img alt="6.用自定义标签控制流程" src="imagemaster/titlebar6.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>控制流程序示例</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr> 第 2 页（共4 页）</nobr></font></td>
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<p>
在开始实现自定义标签处理程序之前，让我们看看示例标签是如何使用的。首先，用上面的例子中的 <code>map</code> 标签定义两个 map：
</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
<%@taglib uri="map" prefix="map"%>
<html>
<head><title>Test Map JSP</title></head>
<body>
<map:map id="employee1">
{
firstName=Jennifer,
lastName=Wirth,
age=33
}
</map:map>
<map:map id="employee2">
{
firstName=Kiley,
lastName=McKeon,
age=27
}
</map:map>
</code>
</pre>
<p>
然后，创建一个名为 <code>list</code> 的集合，加入上面定义的两个 map （<code>employee1</code> 和 <code>employee2</code>）。
</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
<jsp:useBean id="list" class="java.util.ArrayList" />
<%
list.add(employee1);
list.add(employee2);
%>
</code>
</pre>
<p>
下面展示了如何用自定义标签迭代这个集合：
</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
<map:printMaps name="list">
<table border="1">
<tr>
<td>First Name</td>
<td> ${firstName} </td>
<tr>
<td> Last Name </td>
<td> ${lastName} </td>
<tr>
<td>Age</td>
<td> ${age} </td>
</table>
</map:printMaps>
</code>
</pre>
<p>
<code>map:printMaps</code> 标签迭代 <code>list</code> 集合。
在每一次迭代时，它使用其正文，通过搜索以 <code>${key}</code> 开始的子字符，在 map 中搜索当前迭代的键。它从字符串 <code>${}</code> 中解析出键，并用从 map 得到的这个键的值（即
<code>map.get(key)</code>）替换它。
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