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PODifferences between Folder.fetch and getmessages
 

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  1. PODifferences between Folder.fetch and getmessages
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    <p>I'm trying to write an app that get emails from a POP3 server. The "Strategy" I used eventually is:</p> <ol> <li>Get single message</li> <li>check if the message is already present in my database</li> <li>if not, insert it, goto 1</li> </ol> <p>I know that this is not perfect, but ok...let's just face a problem at once :)</p> <p>apologizing for the ugly style, I'm well trained as Assembly and pure C programmer, just started with Java, my code to get the single message is (I have cut the try/catch statements to make it more readable)</p> <pre class="lang-java prettyprint-override"><code>Properties props = new Properties(); Session session = Session.getDefaultInstance(props, null); Store store = null; POP3Folder folder = null; openStaffLabel: { store = session.getStore(exXContainer.accounts[selectedAccount].accountType.toLowerCase()); store.connect(host, username, password); folder =(POP3Folder) store.getFolder("INBOX"); folder.open(Folder.READ_WRITE); int countMsg = 0; countMsg = folder.getMessageCount(); if (countMsg == 0) break openStaffLabel; message = folder.getMessages(countMsg - first + 1); for(int i = 0;i &lt; messages.length;i++) { // do some stuffs with messages } } // openStaffLabel: folder.close(false); store.close(); </code></pre> <p>That seems to work fine. Then I found over internet this code (<a href="http://www.developer.com/java/other/article.php/3092171/JavaMail-More-Efficiently.htm" rel="nofollow">here</a>), claimed by the poster to be much more efficient:</p> <pre class="lang-java prettyprint-override"><code>URLName url = new URLName("pop3", host, 110, "", user, password); Session session = Session.getDefaultInstance(System.getProperties(),null); Store store = session.getStore(url); store.connect(); POP3Folder inbox = (POP3Folder)store.getFolder("INBOX"); inbox.open(Folder.READ_WRITE); FetchProfile profile = new FetchProfile(); profile.add(UIDFolder.FetchProfileItem.UID); Message[] messages = inbox.getMessages(); inbox.fetch(messages,profile); for(int i = 0;i &lt; messages.length;i++) { // do some stuffs with messages } </code></pre> <p>The author claims: "The major difference with the previous scenario is that the client downloads new emails only"</p> <p>but in his code there is a inbox.getMessages() that, if I understood well, actually download all messages. So the point is...what is the real advantage of using fetch(messages,profile) if with getMessages I have already fetched all the headers? if I only want to download UIDs, how can I do? </p> <p>and, furthermore, if I only want to download the UIDs of the first N mails...is it possible?</p> <p>thank you very much to anyone who will help, I'm stuck on this problem since one week. Cristiano</p>
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