j-javamail-8-6.html

JavaMail API 基础教程 用于收发文件

</tr>
</table>
<br>
<br>
</p>
<font size="2" face="Verdana, Arial, Helvetica">
<p>在这个练习中，我们创建了一个程序，它能够显示每条消息的 <i>from</i> 地址和主题，并提示消息内容的显示。</p>
<p>需要更多练习的帮助，请参阅<a href="j-javamail-8-1.html">关于练习</a>.</p>
<p>
<b>先决条件：</b>

<ul>
<li>
<a href="j-javamail-8-2.html">练习 1. 如何设置 JavaMail 环境</a>
</li>
</ul>
</p>
<p>
<b>框架代码</b>

<ul>
<li>
<a href="exercises/MailGetting/GetMessageExample.java">GetMessageExample.java</a>
</li>
</ul>
</p>
<p>
<b>任务 1：</b>

<br>参考<a href="exercises/MailGetting/GetMessageExample.java">框架代码</a>开始着手，获取（或说创建）一个 <code>Properties</code> 对象。</p>
<blockquote>
<p>
<b>任务 1 的帮助：</b>

<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Properties props = new Properties();
</code>
</pre>
</p>
</blockquote>
<p>
<b>任务 2：</b>

<br>获取基于 <code>Properties</code> 的 <code>Session</code> 对象。</p>
<blockquote>
<p>
<b>任务 2 的帮助：</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>任务 3：</b>

<br>获取电子邮件协议 <code>pop3</code> 或 <code>imap</code>的 <code>Store</code>。</p>
<blockquote>
<p>
<b>任务 3 的帮助：</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>任务 4：</b>

<br>用恰当的用户名和密码连接到您的邮件主机的 store。</p>
<blockquote>
<p>
<b>任务 4 的帮助：</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>任务 5：</b>

<br>获取您要读的 folder。很可能会是 <code>INBOX</code>。</p>
<blockquote>
<p>
<b>任务 5 的帮助：</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>任务 6：</b>

<br>以只读方式打开 folder。</p>
<blockquote>
<p>
<b>任务 6 的帮助：</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>任务 7：</b>

<br>获取一个 folder 中的消息目录。将消息列表保存在名为 <code>message</code> 的数组变量中。</p>
<blockquote>
<p>
<b>任务 7 的帮助：</b>

<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
Message message[] = folder.getMessages();
</code>
</pre>
</p>
</blockquote>
<p>
<b>任务 8：</b>

<br>
显示每条消息的 <i>from</i> 域和主题。</p>
<blockquote>
<p>
<b>任务 8 的帮助：</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>任务 9：</b>

<br>在提示时显示消息内容。</p>
<blockquote>
<p>
<b>任务 9 的帮助：</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>任务 10：</b>

<br>关闭到 folder 和 store 的连接。</p>
<blockquote>
<p>
<b>任务 10 的帮助：</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>任务 11：</b>

<br>
在命令行上编译并运行程序 — 传递 SMTP 服务器、用户名和密码。对于想要阅读的消息，以 YES 响应。反之，敲击 <code>ENTER</code>。如果想在读完所有消息前中止，可以输入 QUIT。</p>
<blockquote>
<p>
<b>任务 11 的帮助：</b>

<br>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
java GetMessageExample POP.Server username password
</code>
</pre>
</p>
</blockquote>
<br>
</font></td>
</tr>
</table>
<TABLE border="0" cellpadding="0" cellspacing="0" width="100%">
<TR>
<TD background="../i/sw-gold.gif"><a border="0" href="index.html" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="bottommain"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index8.html"><img alt="章节菜单" border="0" src="../i/section.gif" name="bottomsection"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="j-javamail-9-3.html"><img alt="给出此教程的反馈意见" border="0" src="../i/feedback.gif" name="bottomfeedback"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="j-javamail-8-5.html"><img alt="上页" border="0" src="../i/previous.gif" name="bottomprevious"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topnext'); iOver('bottomnext'); self.status=nextblurb; return true;" onMouseOut="iOut('topnext'); iOut('bottomnext'); self.status=''; return true;" href="j-javamail-8-7.html"><img alt="下页" border="0" src="../i/next.gif" name="bottomnext"></a></TD>
</TR>
<TR>
<TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD>
</TR>
</TABLE>
<TABLE width="100%" cellpadding="0" cellspacing="0" border="0">
<TR>
<TD width="100%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><img alt="" height="1" width="1" src="../i/c.gif"></td>
</tr>
<tr valign="top">
<td class="bbg" height="21">　<a class="mainlink" href="/developerWorks/cgi-bin/click.cgi?url=http://www-900.ibm.com/cn/ibm/index.shtml">关于 IBM</a><span class="divider">　| </span><a class="mainlink" href="/developerWorks/cgi-bin/click.cgi?url=http://www-900.ibm.com/cn/ibm/privacy/index.shtml">隐私条约</a><span class="divider">　| </span><a class="mainlink" href="/developerWorks/cgi-bin/click.cgi?url=http://www-900.ibm.com/cn/ibm/legal/index.shtml">法律条款</a><span class="divider">　| </span><a class="mainlink" href="/developerWorks/cgi-bin/click.cgi?url=http://www-900.ibm.com/cn/ibm/contact/index.shtml">联系 IBM</a></td>
</tr>
</table>
</TD>
</TR>
</TABLE>
</body>
</html>