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<H1>JSP与Java Mail API</H1></DIV>
<DIV id=conauthor><SPAN>2002-04-24 16:14 </SPAN><SPAN>作者: 包路跃 </SPAN><SPAN>出处: 
Yesky </SPAN><SPAN>责任编辑:<A title=向本编辑提问 
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<DIV class=guanggao><SPAN id=contentAdv></SPAN></DIV><BR>  <B>如何实现消息和标志的删除?</B> 
<BR><BR>  消息的删除涉及到与消息相关的 Flags(标志)。不同 flag 
表示不同的状态,有些标志由系统定义,而有些则由用户自己定义。下面列出在内部类 Flags.Flag 
中预定义的标志:<BR>  ·Flags.Flag.ANSWERED <BR>  ·Flags.Flag.DELETED 
<BR>  ·Flags.Flag.DRAFT <BR>  ·Flags.Flag.FLAGGED <BR>  ·Flags.Flag.RECENT 
<BR>  ·Flags.Flag.SEEN <BR>  ·Flags.Flag.USER 
<BR>  上述这些标志只是标准定义,并不意味着所有邮件服务器或供应商都支持所有这些标志。例如,除了删除消息标志外,POP 
协议不再支持其它任何标志。检查是否存在新邮件,这不是个 POP 任务,而是内建于邮件客户机的任务。为找出哪些标志能被支持,可以用 
getPermanentFlags() 向 folder 提出请求。<BR>  要删除消息,您可以设置消息的 DELETED 
flag:<BR>  message.setFlag(Flags.Flag.DELETED, true);<BR>  首先,请以 READ_WRITE 模式打开 
folder:<BR>  folder.open(Folder.READ_WRITE);<BR>  然后,当所有消息的处理完成后,关闭 folder,并传递一个 
true 值,从而擦除(expunge)有 delete 标志的消息。<BR>  folder.close(true);<BR>  一个 Folder 的 
expunge() 方法可以用来删除消息。但 Sun 的 POP3 供应商不支持。其它供应商有的或许能够实现这一功能,而有的则不能。IMAP 
供应商极有可能实现此功能。因为 POP 只支持单个对邮箱的访问,对 Sun 的供应商来说,您必需关闭 folder 以删除消息。<BR>  要取消标志,只要传递 
false 给 setFlag() 方法就行了。想知道是否设置过标志,可以用 isSet() 检查。 <BR><BR>  <B>如何实现认证? 
</B><BR><BR>  想必读者已经知道 ,如果需要可以用一个 Authenticator 
提示用户输入用户名和密码,而不是将用户名和密码作为字符串传递。在这里您会明确了解怎样更充分的使用Java Mail 
API的认证机制。<BR>  不用主机、用户名和密码与 Store 相连接,而是设置 Properties 来拥有主机,然后告诉 Session 自定义的 
Authenticator 实例,如下所示: <BR><BR>
<TABLE cellSpacing=0 cellPadding=0 width=600 bgColor=#ffffff border=0>
  <TBODY>
  <TR>
    <TD>// Setup properties<BR>Properties props = 
      System.getProperties();<BR>props.put("mail.pop3.host", host); <BR><BR>// 
      Setup authentication, get session<BR>Authenticator auth = new 
      PopupAuthenticator();<BR>Session session = 
      Session.getDefaultInstance(props, auth); <BR><BR>// Get the store<BR>Store 
      store = session.getStore("pop3");<BR>store.connect(); 
</TD></TR></TBODY></TABLE><BR>  然后,创建一个 Authenticator 子类并从 
getPasswordAuthentication() 方法中返回 PasswordAuthentication 
对象。下面就是这样一种实现,其中用户名和密码仅占用一个域。(这不是一个 Swing 工程教程;只要将两部分输入同一个域,用逗号分隔就行。) <BR><BR>
<TABLE cellSpacing=0 cellPadding=0 width=600 bgColor=#ffffff border=0>
  <TBODY>
  <TR>
    <TD>import Javax.mail.*;<BR>import Javax.swing.*;<BR>import Java.util.*; 
      <BR><BR>public class PopupAuthenticator extends Authenticator 
      <BR>{<BR>public PasswordAuthentication getPasswordAuthentication() 
      <BR>{<BR>String username, password;<BR>  String result = 
      JOptionPane.showInputDialog("Enter 
      'username,password'");<BR>  StringTokenizer st = new 
      StringTokenizer(result, ",");<BR>  username = 
      st.nextToken();<BR>  password = st.nextToken();<BR>  return new 
      PasswordAuthentication(username, password);<BR>        }<BR>} 
  </TD></TR></TBODY></TABLE><BR>  因为 PopupAuthenticator 涉及到 Swing,它会启动 AWT 
的事件处理线程。这一点基本上要求您在代码中添加一个对 System.exit() 的调用来终止程序。<BR>
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