POP3_收取QQ邮箱邮件的问题

package com.lkb.thirdUtil.emailbank.test;

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;

public class MailExample {

  public static void main (String args[]) throws Exception {
    

    // Get system properties
    Properties props = System.getProperties();

    // Setup mail server
    props.put("mail.pop3.host", "pop.qq.com"); 
    props.put("mail.pop3.port", "995"); 
    // Get session
    props.put("mail.smtp.auth", "true"); //这样才能通过验证
    props.put("mail.pop3.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.pop3.socketFactory.fallback", "false");
    props.setProperty("mail.pop3.socketFactory.port", "995"); 

    MyAuthenticator myauth = new MyAuthenticator("*****@qq.com", "******");
    Session session = Session.getDefaultInstance(props, myauth);
    Store store = session.getStore("pop3"); 
    store.connect();
    //session.setDebug(true);
    System.out.println("成功！");
    Folder folder = store.getFolder("INBOX"); 
    // 只读 
    folder.open(Folder.READ_ONLY);
    Message[] mess=folder.getMessages();
    for (Message message : mess) {
        System.out.println(message.getSubject());
    }
  }
}

package com.lkb.thirdUtil.emailbank.test;

import javax.mail.PasswordAuthentication;

class MyAuthenticator
      extends javax.mail.Authenticator {
    private String strUser;
    private String strPwd;
    public MyAuthenticator(String user, String password) {
      this.strUser = user;
      this.strPwd = password;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(strUser, strPwd);
    }
  }

package com.lkb.thirdUtil.emailbank.test;

import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Folder;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Store;
public class ImapProtocolImpl extends Authenticator 
{
    private Session session;
    private PasswordAuthentication authentication;
    
    public ImapProtocolImpl(String username, String password)
    {
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", "imap");
        props.setProperty("mail.imap.host", "imap.qq.com");
        props.setProperty("mail.imap.port", "993");
        props.put("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.imap.auth.login.disable", "true");
        props.setProperty("mail.imap.auth.plain.disable","true");
        
        authentication = new PasswordAuthentication(username, password);
        session = Session.getInstance(props, this);
        session.setDebug(true);
    }
    
    @Override
    public PasswordAuthentication getPasswordAuthentication()
    {
        return this.authentication;
    }
    
    public void connect()
    {
        try
        {
            Store store = session.getStore();
            store.connect();
            Folder root = store.getDefaultFolder();
            Folder inbox = root.getFolder("inbox");
            inbox.open(Folder.READ_WRITE);
            System.out.println(inbox.getMessageCount());
        }
        catch (MessagingException e)
        {
            try
            {
                byte[] buf = e.getMessage().getBytes("ISO-8859-1");
                System.out.println(new String(buf, "GBK"));
            }
            catch (UnsupportedEncodingException e1)
            {
                e1.printStackTrace();
            }
            throw new RuntimeException("登录失败", e);
        }
    }
}