无法连接到James服务器本地主机

Question

我试图连接到James服务器本地主机，但我发现了一个异常

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 

我的詹姆斯服务器的目录结构：

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 

下面是代码，这是抛出一个异常：

我没有改变任何东西在james-2.3.2子目录的配置文件，那么为什么我是 得到那个异常？

下面的代码，它抛出一个异常：

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

唯一的例外是说，本地主机不可达。我希望你的机器没有正确配置它的环回网络地址（localhost/127.0.0.1）。

编辑：我假设你在同一台机器上运行客户端和服务器。如果不是，则不能使用localhost/127.0.0.1。

Answer 2

我总是尝试telnet到邮件主机上的端口25，以检查是否可以访问服务器。尝试连接到127.0.0.1以检查James是否接受传入连接。我猜你已经检查过詹姆斯的日志了吗？

Answer 3

尝试使用IP地址127.0.0.1而不是主机名'localhost' - 可能您的计算机上的DNS查找设置不正确，以至于它不知道名称'localhost'的含义。

打开文件C:\Windows\System32\drivers\etc\hosts，并确保它包含这样一行：

127.0.0.1  localhost 

此外，尝试关闭您的防火墙或防病毒软件。

Answer 4

• 尝试在Linux中以root用户身份启动apache james或在Windows上以 管理员身份启动。并检查服务器是否成功 在日志文件夹启动或不詹姆斯 - server.log文件

• 添加主机名上您的主机文件

  127.0.0.1  localhost 
  

• 文件放在

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

• 和重启你的服务器。