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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>示例问题</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 8 页（共8 页）</nobr></font></td>
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<font size="2" face="Verdana, Arial, Helvetica"><b>问题 1：</b>
<p>下面哪些不是部署描述符中，<code>&lt;servlet&gt;</code> 元素的子元素？</p>
<p>
<b>选择：</b>
</p>
<ul>
<li>
<b>A.</b> <code>&lt;servlet-mapping&gt;</code>
</li>
<li>
<b>B.</b>  <code>&lt;error-page&gt;</code>
</li>
<li>
<b>C.</b>  <code>&lt;servlet-name&gt;</code>
</li>
<li>
<b>D.</b>  <code>&lt;servlet-class&gt;</code>
</li>
<li>
<b>E.</b>  <code>&lt;init-param&gt;</code>
</li>
</ul>
<p>
<b>正确答案：</b>
</p>
<ul>
<li>
<b>A</b> 和 <b>B</b>
</li>
</ul>
<p>
<b>说明：</b>
</p>
<p>
<code>&lt;servlet-mapping&gt;</code> 和 <code>&lt;error-page&gt;</code> 元素是 <code>&lt;web-app&gt;</code> 元素的子元素。</p>
<p>
<code>&lt;servlet-name&gt;</code> 元素定义了 servlet 的名称，<code>&lt;servlet-class&gt;</code> 元素指定了应该用于实例化 servlet 的 Java 类名称。<code>&lt;init-param&gt;</code> 元素用于传递初始化参数到 servlet。<code>&lt;servlet-mapping&gt;</code> 元素用于指定哪些 URL 模式应该由 servlet 处理。<code>&lt;error-page&gt;</code> 元素可用于指定某些错误页面，这些页面用于某些异常或错误代码。</p>
<p>
<b>问题 2：</b>
</p>
<p>下面请求中哪些请求将不被 <code>MyServlet</code> 服务（假定 Web 应用程序名称是 test）？</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
&lt;servlet-mapping&gt;
    &lt;servlet-name&gt; MyServlet  &lt;/servlet-name&gt;
    &lt;url-pattern&gt;	/my/my/*   &lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;
</code>
</pre>
<p>
<b>选择：</b>
</p>
<ul>
<li>
<b>A.</b> /test/my/my/my</li>
<li>
<b>B.</b> /test/my/my/a/b</li>
<li>
<b>C.</b> /test/my/my/a.jsp</li>
<li>
<b>D.</b> /test/my/a.jsp</li>
<li>
<b>E.</b> /test/my/my.jsp</li>
</ul>
<p>
<b>正确答案：</b>
</p>
<ul>
<li>
<b>D</b> 和 <b>E</b>
</li>
</ul>
<p>
<b>说明：</b>
</p>
<p>要让请求 URL 与 servlet 匹配，servlet 容器要确定上下文路径，然后用部署描述符中指定的 servlet 映射，计算请求 URL 的其余部分。它通过沿请求 URI 路径树向下每次一个目录前进，使用&ldquo;/&rdquo;字符作为路径分隔符，并确定是否与 servlet 匹配，来尝试递归匹配最长的路径。如果匹配，请求 URL 的匹配部分就是 servlet 路径，其余部分就是路径信息。在该例中，当 servlet 碰到具有路径&ldquo;/test/my&rdquo;的任何请求，它将把那个请求映射到 <code>MyServlet</code>。在选项 A、B 和 C 中，该路径是存在的，因此它们由  <code>MyServlet</code> 服务。选项 D 和 E 不具有该完整路径，所以它们没有得到服务。</p>
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