12

我在发送电子邮件时遇到问题。

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)

我使用下面的代码片段。

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

电子邮件发送程序在 tomcat 5 上运行。有时它工作正常，有时它会导致异常。一旦它导致上述异常，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，它就会再次开始正常工作。

所以我找不到是什么原因。因为有时相同的工作正常，有时会导致异常。

任何人都可以帮我解决这个问题。

4

6 回答 6

12 
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 = "xxxx@gmail.com";//
    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("xxxx@gmail.com"));
      msg.setRecipients(Message.RecipientType.TO, 
                        InternetAddress.parse("user120@example.com",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);
    }
  }
}
于 2014-12-28T05:04:06.610 回答
3

从您的异常中可以清楚地看出它正在尝试连接localhost而不是连接10.101.3.229

异常片段：Could not connect to SMTP host: localhost, port: 25;

1.）请检查是否有任何将localhost设置为默认值的空检查

2.) 重新启动后，如果它工作正常，那么这意味着只有在第一次运行时，才从属性中获取正确的值，并且从下一次运行时该值设置为默认值。因此，将属性对象保持为单例，并在整个项目中使用它

于 2013-10-21T12:05:08.143 回答
0

这不应该发生。你可以试试这样做吗？使用系统属性并设置属性如下：

Properties properties = System.getProperties();
// Setup mail server
properties.setProperty("mail.smtp.host", "10.101.3.229");

如果你有一个相关的端口，那么也设置它。

properties.setProperty("mail.smtp.port", "8080");
于 2015-04-04T14:06:53.557 回答
0

Try to set the property when starting JVM, for example, add -Djava.net.preferIPv4Stack=true.

You can't set it when code running, as the java.net just read it when jvm starting.

And about the root cause, this article give some hint: Why do I need java.net.preferIPv4Stack=true only on some windows 7 systems?.

于 2016-09-06T00:45:52.717 回答
0

只需查看此解决方案，确保您已在您的 google 帐户上打开对安全性较低的应用程序的访问权限：javax.mail.MessagingException：无法连接到 SMTP 主机：localhost，端口：25

于 2020-04-07T16:25:55.990 回答
0

我也面临同样的错误。原因是您的环境中没有 smtp 服务器。为了创建一个假的 smtp 服务器，我使用这个 fake-smtp.jar 文件来创建一个虚拟服务器并监听所有请求。如果您遇到同样的错误，我建议您使用这个 jar 并在解压后运行它，然后尝试运行您的应用程序。

下载最新版本的假 smtp

于 2018-08-21T13:15:20.900 回答