Receiver Mail via Gmail POP3

รับ mail ของ gmail ผ่าน pop3

import java.util.Properties;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;
import com.sun.mail.pop3.POP3SSLStore;

public class SimpleReceiver {

 public static void main(String[] args) {
  try {
   String popServer = "pop.gmail.com";
   String user = "yourmail@gmail.com";
   String password = "yourpassword";
   System.out.println("receive mail");
   receive(popServer, user, password);
   System.out.println("--- complete ---");
  } catch (Exception ex) {
   ex.printStackTrace();
  }
 }
 
 public static void receive(String popServer, String user, String password) {
  Store store = null;
  Folder folder = null;
  try {
   String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
   Properties props = System.getProperties();
   props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
   props.setProperty("mail.pop3.socketFactory.fallback", "false");
   props.setProperty("mail.pop3.port", "995");
   props.setProperty("mail.pop3.socketFactory.port", "995");

   URLName url = new URLName("pop3", popServer, 995, "", user, password);
   
   Session session = Session.getDefaultInstance(props, null);

   System.out.println("connect");
   store = new POP3SSLStore(session, url);
   store.connect();

   System.out.println("folder");
   folder = store.getDefaultFolder();
   folder = folder.getFolder("inbox");
   if (folder == null) {
    throw new Exception("No default folder");
   }
   
   try {
    folder.open(Folder.READ_WRITE);
   } catch (MessagingException ex) {
    folder.open(Folder.READ_ONLY);
   }
   
   System.out.println("message: " + folder.getMessageCount());
   System.out.println("new: " + folder.getNewMessageCount());
   
   Message[] message = folder.getMessages();
//   FetchProfile fp = new FetchProfile();
//   fp.add(FetchProfile.Item.ENVELOPE);
//   folder.fetch(message, fp);
   for (int i = 0; i<message.length; i++) {
    String ct = message[i].getContentType();
    if (message[i].isMimeType("text/plain")) {
     System.out.println("message [" + i + "]:" + message[i].getContent());
    } else {
     System.out.println("message [" + i + "]:" + "not plain text.");
    }
    
   }
   
  } catch (Exception ex1) {
   ex1.printStackTrace();
  } finally {
   try {
    if (folder != null) folder.close(false);
    if (store != null) store.close();
   } catch (Exception ex2) {
    ex2.printStackTrace();
   }
  }
 }
 
}