Reading email (Gmail,Yahoo,Outlook/live) using java code

I have requirement to read user email box with user permissions and display contents in single inbox.
Program will ask user input userid/password and we also pass param to identify gmail or yahoo etc.

package com.java.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import java.util.Properties;

import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.search.FlagTerm;

/**
 *
 * @author vaquar.khan@gmail.com
 *
 */
public class EmailReader {

final  private static String MAIL_STORE="mail.store.protocol";
final  private static String IMAP="imaps";
//
final  private static String GMAIL_IMAP="imap.gmail.com";
final  private static String GMAIL_EMAIL_ID="";
final  private static String GMAIL_EMAIL_PASSWORD="";
//
final  private static String YAHOO_IMAP="imap.mail.yahoo.com";
final  private static String YAHOO_EMAIL_ID="";
final  private static String YAHOO_EMAIL_PASSWORD="";
//
final  private static String MICROSOFT_IMAP="imap-mail.outlook.com";
final  private static String MICROSOFT_EMAIL_ID="";
final  private static String MICROSOFT_EMAIL_PASSWORD="";

   public static void main(String args[]) {
   
    readEamil("MICROSOFT") ;
   }


    public static void readEamil(String emailType) {
        Properties props = System.getProperties();
        props.setProperty(MAIL_STORE, IMAP);
        try {
                Session session = Session.getDefaultInstance(props, null);
                Store store = session.getStore(IMAP);

                if(emailType=="GMAIL"){
                // IMAP host for gmail.
                store.connect(GMAIL_IMAP, GMAIL_EMAIL_ID, GMAIL_EMAIL_PASSWORD);
                }else if(emailType=="YAHOO"){
                // IMAP host for yahoo.
                store.connect(YAHOO_IMAP, YAHOO_EMAIL_ID, YAHOO_EMAIL_PASSWORD);
                }else if(emailType=="MICROSOFT"){
                // IMAP host for MICROSOFT.
                store.connect(MICROSOFT_IMAP, MICROSOFT_EMAIL_ID, MICROSOFT_EMAIL_PASSWORD);
                }
                System.out.println(store);

                Folder inbox = store.getFolder("Inbox");
                inbox.open(Folder.READ_ONLY);
               
                BufferedReader optionReader = new BufferedReader(new InputStreamReader(System.in));
                System.out.println("Press (U) to get only unread mails OR Press (A) to get all mails:");
                try {
                    char answer = (char) optionReader.read();
                    if(answer=='A' || answer=='a'){
                        showAllMails(inbox);
                    }else if(answer=='U' || answer=='u'){
                        showUnreadMails(inbox);
                    }
                    optionReader.close();
                } catch (IOException e) {
                    System.out.println(e);
                }
               
        } catch (NoSuchProviderException e) {
            System.out.println(e.toString());
            System.exit(1);
        } catch (MessagingException e) {
            System.out.println(e.toString());
            System.exit(2);
        }

    }
   
    static public void showUnreadMails(Folder inbox){      
        try {
            FlagTerm ft = new FlagTerm(new Flags(Flags.Flag.SEEN), false);
            Message msg[] = inbox.search(ft);
            System.out.println("MAILS: "+msg.length);
            for(Message message:msg) {
                try {
                    System.out.println("DATE: "+message.getSentDate().toString());
                    System.out.println("FROM: "+message.getFrom()[0].toString());          
                    System.out.println("SUBJECT: "+message.getSubject().toString());
                    System.out.println("CONTENT: "+message.getContent().toString());
                    System.out.println("******************************************");
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    System.out.println("No Information");
                }
            }
        } catch (MessagingException e) {
            System.out.println(e.toString());
        }
    }
   
    static public void showAllMails(Folder inbox){
        try {
            Message msg[] = inbox.getMessages();
            System.out.println("MAILS: "+msg.length);
            for(Message message:msg) {
                try {
                    System.out.println("DATE: "+message.getSentDate().toString());
                    System.out.println("FROM: "+message.getFrom()[0].toString());          
                    System.out.println("SUBJECT: "+message.getSubject().toString());
                    System.out.println("CONTENT: "+message.getContent().toString());
                    System.out.println("******************************************");
                } catch (Exception e) {
                    System.out.println("No Information");
                }
            }
        } catch (MessagingException e) {
            System.out.println(e.toString());
        }
    }

}

Read More