javax.mail.MessagingException：无法连接到SMTP主机：localhost，port：25 [英] javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25

问题描述

我在发送电子邮件时遇到问题。

I am getting issue while sending email.

javax.mail.SendFailedException: Sending failed;
  nested exception is: 
    javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
  nested exception is: 
    java.net.ConnectException: Connection refused: connect
    at javax.mail.Transport.send0(Transport.java:219)
    at javax.mail.Transport.send(Transport.java:81)
    at org.apache.jsp.online_005fScheme_005fSend_005fMail_jsp.sendMail(online_005fScheme_005fSend_005fMail_jsp.java:116)
    at org.apache.jsp.online_005fScheme_005fSend_005fMail_jsp._jspService(online_005fScheme_005fSend_005fMail_jsp.java:416)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:619)

---

我使用下面的代码snipet。

---

I use below code snipet.

Properties props = new Properties();
     props.put("mail.smtp.host", "10.101.3.229");

电子邮件发送程序正在tomcat上运行5.有时它工作正常，有时它会在上面产生例外。一旦它产生上述异常，它在每次访问时都会产生相同的结果。但是一旦我重新启动tomcat服务器，它就会再次正常运行。

email send program is running on tomcat 5. Some times it is working fine and some times it results above exception. once it satart resulting above exception it results the same on every access. but as soon as i restart tomcat server it starts working fine again.

所以我找不到原因。因为有时同样工作正常，有时会导致异常。

So i could not find what is reason. as sometimes same is working fine and sometimes results above exception.

任何人都可以帮我解决这个问题。

Can anybody help me out this issue.

推荐答案

package sn;
import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendEmail {
  public static void main(String[] args) {
  final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
  // Get a Properties object
     Properties props = System.getProperties();
     props.setProperty("mail.smtp.host", "smtp.gmail.com");
     props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
     props.setProperty("mail.smtp.socketFactory.fallback", "false");
     props.setProperty("mail.smtp.port", "465");
     props.setProperty("mail.smtp.socketFactory.port", "465");
     props.put("mail.smtp.auth", "true");
     props.put("mail.debug", "true");
     props.put("mail.store.protocol", "pop3");
     props.put("mail.transport.protocol", "smtp");
     final String username = "[e-mail]";//
     final String password = "0000000";
     try{
     Session session = Session.getDefaultInstance(props, 
                          new Authenticator(){
                             protected PasswordAuthentication getPasswordAuthentication() {
                                return new PasswordAuthentication(username, password);
                             }});

   // -- Create a new message --
     Message msg = new MimeMessage(session);

  // -- Set the FROM and TO fields --
     msg.setFrom(new InternetAddress("[e-mail]"));
     msg.setRecipients(Message.RecipientType.TO, 
                      InternetAddress.parse("[e-mail]",false));
     msg.setSubject("Hello");
     msg.setText("How are you");
     msg.setSentDate(new Date());
     Transport.send(msg);
     System.out.println("Message sent.");
  }catch (MessagingException e){ System.out.println("Erreur d'envoi, cause: " + e);}
  }

}

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