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java SendMailDemo mysmtpserver myemail@mydomain
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While sending messages is useful, it is only part of the functionality of the JavaMail API Reading messages from an Internet mail server (such as an IMAP/POP3 account or a newsgroup), is also possible, as the next example demonstrates Code for ReadMailDemo
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import javaxmail*; import javaxmailinternet*; // 13, Listing 3 public class ReadMailDemo { public static void main (String args[]) { int argc = argslength; // Check for valid number of parameters if (argc != 4) { Systemoutprintln ("Syntax :"); Systemoutprintln ( "java ReadMailDemo protocol host username password"); return; }
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String String String String try {
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protocol host username password
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args[0]; args[1]; args[2]; args[3];
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// Get a session, with default system properties Session mySession = SessiongetDefaultInstance (SystemgetProperties(), null); // Get a specific mail store, such as // imap/pop3/news Store myStore = mySessiongetStore(protocol); myStoreconnect (host, username, password); // Request the INBOX folder for this mail store Folder myFolder = myStoregetFolder("INBOX"); if (myFolder == null) { Systemerrprintln ("No default folder available"); return; } Systemoutprintln ("Accessing " + myFoldergetFullName() + " folder"); // Open in READ_ONLY mode myFolderopen(FolderREAD_ONLY); int messagecount = myFoldergetMessageCount(); Systemoutprintln (myFoldergetFullName() + " has " + messagecount + " messages"); Message[] message = myFoldergetMessages (); for (int i = 0; i < messagelength; i++) { Address[] fromAddr = message[i]getFrom(); Systemoutprintln (fromAddr[0] + ":" + message[i]getSubject()); } myFolderclose(false); } catch (MessagingException me) { Systemerrprintln ("Messaging failure : " + me); } catch (Exception ex) { Systemerrprintln ("Failure : " + ex); } } }
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How ReadMailDemo Works
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As in the previous example, it is necessary here to import the basic JavaMail packages We won't be specifying any properties, however, and the import statement for javautilProperties can be omitted
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import javaxmail*; import javaxmailinternet*;
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The next thing that must be done is to check command-line parameters There are four parameters to this example, which control the protocol used (either IMAP or POP3), the hostname of the mail service, the username, and finally the password If there are missing or extra parameters, a message showing the correct syntax will be displayed
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int argc = argslength; // Check for valid number of parameters if (argc != 4) { Systemoutprintln ("Syntax :"); Systemoutprintln ("java ReadMailDemo protocol host username password"); return; } String String String String protocol host username password = = = = args[0]; args[1]; args[2]; args[3];
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Next, we need to get an instance of the Session class, by using the static method SystemgetInstance() We don't need to specify any properties, but the method still requires a Properties object We could create a new Properties instance that is blank, but it is better to select the default system properties, as any existing property settings will be preserved
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// Get a session, with default system properties Session mySession = SessiongetDefaultInstance (SystemgetProperties(), null);
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The application can now connect to a mail store Since the user of the application will specify a protocol as a command-line parameter, we don't need to choose the protocol ourselves This shows the power of JavaMail whether you're working with a POP3 server, an IMAP server, or some other type of mail server, the code will remain the same Before using a mail store, though, it is important that it is actually connected Here we specify the hostname, username, and password, by using the Storeconnect() method
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// Get a specific mail store, such as imap/pop3/news Store myStore = mySessiongetStore(protocol); myStoreconnect (host, username, password);
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Mail systems store messages in folders Some mail systems may have many folders, whereas others may support just one folder Generally, the INBOX folder will be the default folder for incoming messages The application requests the INBOX folder, and opens it in READ_ONLY mode Before a folder can be used, it must be opened
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// Request the INBOX folder for this mail store Folder myFolder = myStoregetFolder("INBOX"); Systemoutprintln ("Accessing mail account now");
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// Open in READ_ONLY mode myFolderopen(FolderREAD_ONLY);
The folder, now open, can be used to retrieve messages First, the application requests a count of the total number of messages available Next, it uses this information to select a batch of messages, from the first message to the last This will be returned as an array of messages NOTE Messages are numbered from 1 (1 is the first message) Arrays in Java are zero-indexed, meaning that the first element is element 0
int messagecount = myFoldergetMessageCount(); Systemoutprintln (myFoldergetFullName() + " has " + message count + " messages"); Message[] message = myFoldergetMessages ();
The application then traverses through each element of the array (starting with the first message, at element 0) The application displays the sender of the message as well as the message subject Message has a getFrom() method that returns an array of Address objects There isn't a simple way to get the sender of the message, so to display the sender, you can usually simply access the first element of this array The JavaMail API allows for multiple senders, so if the mailing system your application is using supports this facility, then for completeness you may want to have your applications check the length of the "From" array Getting the subject of the message is far easier simply call the getSubject() method
for (int i = 0; i < messagelength; i++) { Address[] fromAddr = message[i]getFrom(); Systemoutprintln (fromAddr[0] + ":" + message[i]getSubject()); }
Finally, we can clean up open folders and connections to mail services by calling the close method on any open folders or stores The Folderclose() method takes a boolean flag parameter, indicating whether any messages marked "deleted" should be removed As we're opening the folder in read-only mode anyway, this is unnecessary, so a value of "false" is passed
// Close messages, don't expunge myFolderclose(false); // Close connection to store myStoreclose();
Running ReadMailDemo You'll need to specify four parameters for this demonstration These are the name of the mail protocol to use, the hostname of the mail service, the username of the account, and finally the password If you have an IMAP account, use the protocol name of "imap," and for a POP3
account, use the protocol name of "pop3" Remember, too, if you haven't done so already, to install any additional protocol implementations that you require NOTE Case sensitivity applies to protocol names "POP3" is not treated the same way as "pop3"
The syntax for the ReadMailDemo is as follows: