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<p>在這個(gè)練習(xí)中，我們創(chuàng)建了一個(gè)程序，它能夠顯示每條消息的 <i>from</i> 地址和主題，并提示消息內(nèi)容的顯示。</p>
<p>需要更多練習(xí)的幫助，請(qǐng)參閱<a href="j-javamail-8-1.html">關(guān)于練習(xí)</a>.</p>
<p>
<b>先決條件：</b>
<ul>
<li>
<a href="j-javamail-8-2.html">練習(xí) 1. 如何設(shè)置 JavaMail 環(huán)境</a>
</li>
</ul>
</p>
<p>
<b>框架代碼</b>
<ul>
<li>
<a href="exercises/MailGetting/GetMessageExample.java">GetMessageExample.java</a>
</li>
</ul>
</p>
<p>
<b>任務(wù) 1：</b>
<br>參考<a href="exercises/MailGetting/GetMessageExample.java">框架代碼</a>開始著手，獲取（或說創(chuàng)建）一個(gè) <code>Properties</code> 對(duì)象。</p>
<blockquote>
<p>
<b>任務(wù) 1 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Properties props = new Properties();
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 2：</b>
<br>獲取基于 <code>Properties</code> 的 <code>Session</code> 對(duì)象。</p>
<blockquote>
<p>
<b>任務(wù) 2 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Session session = Session.getDefaultInstance(props, null);
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 3：</b>
<br>獲取電子郵件協(xié)議 <code>pop3</code> 或 <code>imap</code>的 <code>Store</code>。</p>
<blockquote>
<p>
<b>任務(wù) 3 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Store store = session.getStore("pop3");
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 4：</b>
<br>用恰當(dāng)?shù)挠脩裘兔艽a連接到您的郵件主機(jī)的 store。</p>
<blockquote>
<p>
<b>任務(wù) 4 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
store.connect(host, username, password);
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 5：</b>
<br>獲取您要讀的 folder。很可能會(huì)是 <code>INBOX</code>。</p>
<blockquote>
<p>
<b>任務(wù) 5 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Folder folder = store.getFolder("INBOX");
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 6：</b>
<br>以只讀方式打開 folder。</p>
<blockquote>
<p>
<b>任務(wù) 6 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
folder.open(Folder.READ_ONLY);
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 7：</b>
<br>獲取一個(gè) folder 中的消息目錄。將消息列表保存在名為 <code>message</code> 的數(shù)組變量中。</p>
<blockquote>
<p>
<b>任務(wù) 7 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Message message[] = folder.getMessages();
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 8：</b>
<br>
顯示每條消息的 <i>from</i> 域和主題。</p>
<blockquote>
<p>
<b>任務(wù) 8 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
System.out.println(i + ": " + message[i].getFrom()[0]
+ "\t" + message[i].getSubject());
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 9：</b>
<br>在提示時(shí)顯示消息內(nèi)容。</p>
<blockquote>
<p>
<b>任務(wù) 9 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
System.out.println(message[i].getContent());
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 10：</b>
<br>關(guān)閉到 folder 和 store 的連接。</p>
<blockquote>
<p>
<b>任務(wù) 10 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
folder.close(false);
store.close();
</code>
</pre>
</p>
</blockquote>
<p>
<b>任務(wù) 11：</b>
<br>
在命令行上編譯并運(yùn)行程序 — 傳遞 SMTP 服務(wù)器、用戶名和密碼。對(duì)于想要閱讀的消息，以 YES 響應(yīng)。反之，敲擊 <code>ENTER</code>。如果想在讀完所有消息前中止，可以輸入 QUIT。</p>
<blockquote>
<p>
<b>任務(wù) 11 的幫助：</b>
<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
java GetMessageExample POP.Server username password
</code>
</pre>
</p>
</blockquote>
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