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<a name="navskip"></a><td height="25" colspan="4"><img alt="3.循序漸進的定制標記示例（標記庫）" src="imagemaster/titlebar3.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>定制標記的方法級別的 JavaDoc 標記</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr> 第 2 頁（共4 頁）</nobr></font></td>
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<p>
現在來講有點不同的內容。在 servlet 示例中，所有的特別的 JavaDoc 標記是類級別的。定制標記示例使用方法級別的 JavaDoc 標記來為這個示例中的三個屬性（<code>includeBody</code>、<code>includePage</code> 和 <code>iterate</code>）定義定制標記屬性：
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
/** Getter for property includePage.
* @return Value of property includePage.
* @jsp.attribute required="true"
* rtexprvalue="true"
* description="The includePage attribute"
*/
public boolean isIncludePage() {
return this.includePage;
}
...
/** Getter for property includeBody.
* @return Value of property includeBody.
* @jsp:attribute required="true"
* rtexprvalue="true"
* description="The includeBody attribute"
*/
public boolean isIncludeBody() {
return this.includeBody;
}
...
/** Getter for property iterate.
* @return Value of property iterate.
* @jsp:attribute required="true"
* rtexprvalue="true"
* description="The iterate attribute"
*/
public int getIterate() {
return this.iterate;
}
</code>
</pre>
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<p>請注意，JavaDoc 標記 <code>jsp.attribute</code> 被用來把這個屬性（property）定義為屬性（attribute）。這段代碼生成 TLD 文件的<code></code>定義中的以下代碼：</p>
<p>
<attribute>
<name>iterate</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<description>The iterate attribute</description>
</attribute>
<attribute>
<name>includeBody</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<description>The includeBody attribute</description>
</attribute>
<attribute>
<name>includePage</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<description>The includePage attribute</description>
</attribute>
定制標記及其所有的變量和屬性是難以管理和保持同步的。您可以從這個示例看到，XDoclet 可以使復雜的事情變簡單，它使您能夠在一個（而不是兩個）文件中定義所有這些所需的元數據。這大大簡化了定制標記的使用 － 可能足夠的簡單，以至于您可以開始把定制標記應用于您的項目。</p>
<p>設想一下重構和更改對應于屬性的 getter 和 setter 方法的名稱。如果沒有 XDoclet，那么您不得不在 TLD 文件中搜索。太痛苦了！</p>
<p>這樣都很好，但是您如何從 Java 源文件生成 TLD 文件？</p>
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