addMessageCountListener doesn't work in javamail

问题:

I'm trying to use addMessageCountListener (for POP3 protocol) in a small project, but it doesn't work.

This is code where I added listener:

protected void openFolder() {     try {          this.inbox = this.store.getFolder("INBOX");          if (inbox == null) {              throw new Exception("No POP3 INBOX");          }          this.inbox.open(Folder.READ_WRITE);          this.inbox.addMessageCountListener(new MessageCountAdapter() {              public void messagesAdded(MessageCountEvent ev) {                  System.out.println("Event");                  Message [] msgs = ev.getMessages();                  for (Message msg : msgs) {                      System.out.println("msg");                      System.out.println(AbstractReceiverClient.getTextFromMsg("email", "subject", msg));                 }             }              public void messagesRemoved(MessageCountEvent ev) {}        });     }     catch(Exception e) {         System.out.println(e.getMessage());     } } 

Here, I ask server for count of messages per 5 seconds.

public void worker() {     try {         while(true){             java.lang.Thread.sleep(5000);             System.out.println(this.inbox.getMessageCount());         }     }     catch(Exception e){} } 

As the result, I just see only count of messages (g.e. 18), but I've sent a message after programm was run.

PS. Thanks for help

回答1:

That's because the POP3 protocol doesn't allow new messages to appear in your INBOX while it's open.

文章来源: addMessageCountListener doesn't work in javamail