無法連接到James服務器本地主機

Question

我試圖連接到James服務器本地主機，但我發現了一個異常

javax.mail.MessagingException: Could not connect to SMTP host: localhost, port:25; 
nested exception is: 
      java.net.SocketException: Network is unreachable: connect 
      at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1545) 
      at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:453) 
      at javax.mail.Service.connect(Service.java:313)  
      at javax.mail.Service.connect(Service.java:172) 
      at javax.mail.Service.connect(Service.java:121) 
      at javax.mail.Transport.send0(Transport.java:190) 
      at javax.mail.Transport.send(Transport.java:120) 
      at mail.main(mail.java:78) 
    Caused by: java.net.SocketException: Network is unreachable: connect 
      at java.net.PlainSocketImpl.socketConnect(Native Method) 
      at java.net.PlainSocketImpl.doConnect(Unknown Source) 
      at java.net.PlainSocketImpl.connectToAddress(Unknown Source) 
      at java.net.PlainSocketImpl.connect(Unknown Source) 
      at java.net.SocksSocketImpl.connect(Unknown Source) 
      at java.net.Socket.connect(Unknown Source) 
      at java.net.Socket.connect(Unknown Source) 
      at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:267) 
      at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:227) 
      at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1511) 
      ... 7 more 

我的詹姆斯服務器的目錄結構：

C:\apache-james-2.3.2 
| 
| 
| 
|------C:\apache-james-2.3.2\james-2.3.2 
| 
|------C:\apache-james-2.3.2\javamail-1.4.2 
| 
|------C:\apache-james-2.3.2\jaf-1.0.2 

下面是代碼，這是拋出一個異常：

我沒有改變任何東西在james-2.3.2子目錄的配置文件，那麼爲什麼我是 得到那個異常？

下面的代碼，它拋出一個異常：

import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.Properties; 
import javax.mail.*; 
import javax.mail.internet.*; 

public class mail{ 

public static void main(String[] argts){ 




     String to = "blue@localhost"; 



     String from = "red@localhost"; 
     String subject = "Hello"; 
     String body = "What's up"; 

     if ((from != null) && (to != null) && (subject != null) && (body != null)) // we have mail to send 
     { 

     try { 




     Properties props = new Properties(); 

    props.put("mail.host", "localhost"); 

    props.put("mail.smtp.auth","true"); 
    props.put("mail.debug","true"); 
    Session session = Session.getInstance(props, new javax.mail.Authenticator() { 

protected PasswordAuthentication getPasswordAuthentication() { 
return new PasswordAuthentication("red", "red"); 
} 
}); 





      Message message = new MimeMessage(session); 
      message.setFrom(new InternetAddress(from)); 
    Address[] add={ new InternetAddress(to) }; 
      message.setRecipients(Message.RecipientType.TO,add); 
      message.setSubject(subject); 
      message.setContent(body, "text/plain"); 
      message.setText(body); 
      Transport.send(message); 


      System.out.println(" Your message to " + to + " was successfully sent."); 

     } catch (Throwable t) { 
      t.printStackTrace(); 
     } 


     } 

    } 


} 

Answer 1

唯一的例外是說，本地主機不可達。我希望你的機器沒有正確配置它的環回網絡地址（localhost/127.0.0.1）。

編輯：我假設你在同一臺機器上運行客戶端和服務器。如果不是，則不能使用localhost/127.0.0.1。

Answer 2

我總是嘗試telnet到郵件主機上的端口25，以檢查是否可以訪問服務器。嘗試連接到127.0.0.1以檢查James是否接受傳入連接。我猜你已經檢查過詹姆斯的日誌了嗎？

Answer 3

嘗試使用IP地址127.0.0.1而不是主機名'localhost' - 可能您的計算機上的DNS查找設置不正確，以至於它不知道名稱'localhost'的含義。

打開文件C:\Windows\System32\drivers\etc\hosts，並確保它包含這樣一行：

127.0.0.1  localhost 

此外，嘗試關閉您的防火牆或防病毒軟件。

Answer 4

• 嘗試在Linux中以root用戶身份啓動apache james或在Windows上以 管理員身份啓動。並檢查服務器是否成功 在日誌文件夾啓動或不詹姆斯 - server.log文件

• 添加主機名上您的主機文件

  127.0.0.1  localhost 
  

• 文件放在

  on linux /etc/hosts 
  on windows C:\Windows\System32\drivers\etc\hosts 
  

• 和重啓你的服務器。