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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>JavaBeans Activation Framework 的安裝</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 頁（共6 頁）</nobr></font></td>
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<p>JavaMail API 的所有版本都需要 JavaBeans Activation Framework 來支持任意數據塊的輸入及相應處理。功能似乎不多，但目前許多瀏覽器和郵件工具中都能找到這種基本的 MIME 型支持。<a href="http://java.sun.com/products/javabeans/glasgow/jaf.html">下載</a>完框架后，解開 <code>jaf1_0_1.zip</code> 文件，并將 <code>activation.jar</code> 文件添加到 CLASSPATH 中。</p>
<p>對于 JavaMail 1.2 用戶來說，現在您應該已將 <code>mail.jar</code> 和 <code>activation.jar</code> 文件添加到 CLASSPATH 中了。</p>
<p>而對于 JavaMail 1.1.3 用戶，現在您應該已將 <code>mail.jar</code>、<code>pop3.jar</code>和 <code>activation.jar</code>文件添加到 CLASSPATH 中了。如果不打算用 POP3，就不必將 <code>pop3.jar</code> 添加到 CLASSPATH 中去。</p>
<p>如果您不想更改 CLASSPATH 環境變量，將 jar 文件復制到您 Java 運行時環境（Java Runtime Environment，JRE）目錄下的 <code>lib/ext</code> 目錄中去。例如，J2SE 1.3 發行版的缺省目錄在 Windows 平臺的 <code>C:\jdk1.3\jre\lib\ext</code>。</p>
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