我無法使用javamailAPI程序檢查電子郵件嗎？

Question

我使用此代碼使用javamail API連接到Java中的Gmail帳戶，但是運行它時出現異常。 我可以通過瀏覽器訪問網絡中的gmail.com 。：

import java.util.Properties;
import javax.mail.Session;
import javax.mail.Folder;
import javax.mail.Address;
import javax.mail.Store;
import javax.mail.Message;

public class Mailread {

public static void main(String args[])
{

    Properties prop=new Properties();
    prop.put("mail.pop3.host","pop.gmail.com" );
    prop.put("mail.pop3.port","995");
    prop.put("mail.pop3.starttls.enable",true);

    Session session= Session.getDefaultInstance(prop);
    try
    {
    Store store=session.getStore("pop3s");
    store.connect("pop.gmail.com","myusername@gmail.com","password");
    Folder folder=store.getFolder("INBOX");
    folder.open(Folder.READ_ONLY);
    Message message=folder.getMessage(3);
    System.out.println(message.getMessageNumber());
    System.out.println(message.getFrom());



    }
    catch(Exception e)
    {
     e.printStackTrace();
     System.exit(0);

    }

  }

   } 

例外：

com.sun.mail.util.MailConnectException: Couldn't connect to host, port:       pop.gmail.com, 995; timeout -1;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:211)
at javax.mail.Service.connect(Service.java:364)
at javax.mail.Service.connect(Service.java:245)
at MailPackage.Mailread.main(Mailread.java:32)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:329)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:236)
at com.sun.mail.pop3.Protocol.<init>(Protocol.java:112)
at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:264)
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:207)
... 3 more

.................................................. ...............................

Answer 1

您需要在連接gmail時使用Authneticator。

下面的代碼應該為您工作

// Setup authentication, get session
Session emailSession = Session.getInstance(properties,
     new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
           return new PasswordAuthentication(
              "manisha@gmail.com", "manisha123");
        }
     });

Store store = session.getStore("imaps");
store.connect("smtp.gmail.com", "*************@gmail.com","your_password");

Folder inbox = store.getFolder("inbox");
inbox.open(Folder.READ_ONLY);
int messageCount = inbox.getMessageCount();

System.out.println("Total Messages:- " + messageCount);

Message[] messages = inbox.getMessages();
System.out.println("------------------------------");
for (int i = 0; i < 10; i++) {
   System.out.println("Mail Subject:- " + messages[i].getSubject());      
}

請讓我知道是否需要任何進一步的信息。