用java发送邮件有什么问题，我得到javax.mail.MessaginException

我想用JAVA发送邮件，这是我写的代码，但不适用于我。它是这样抛出异常的

    import java.util.Properties;

    import javax.mail.Message;
    import javax.mail.MessagingException;
    import javax.mail.PasswordAuthentication;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;

    public class SendeMails {

/***
*    gmail via TLS
*
**/
/*
    public static void main(String[] args) {

        final String username = "username@gmail.com";
        final String password = "password";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");

        Session session = Session.getInstance(props,
          new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
          });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("username@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("to@gmail.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler,"
                + "\n\n No spam to my email, please!");

            javax.mail.Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
*/  
/***
*    gmail via SSL
*
**/
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("username","password");
                }
            });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("from@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("to@no-spam.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler," +
                    "\n\n No spam to my email, please!");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
    }

javax.mail.MessaginException:无法连接到SMTP主机：localhost，端口：25

我的代码在这里：

import java.util.*;  
import javax.mail.*;  
import javax.mail.internet.*;  
import javax.activation.*;  

 public class SendEmail  
 {  
 public static void main(String [] args){  
    String to = "to@gmail.com";  
    String from = "from@gmail.com";
    String host = "localhost"; 

  //Get the session object  
  Properties properties = System.getProperties();  
  properties.setProperty("mail.smtp.host", host);  
  Session session = Session.getDefaultInstance(properties);  

  //compose the message  
  try{  
     MimeMessage message = new MimeMessage(session);  
     message.setFrom(new InternetAddress(from));  
        message.addRecipient(Message.RecipientType.TO,
       newInternetAddress(to));  
     message.setSubject("Ping");  
     message.setText("Hello, this is example of sending email  ");  

     // Send message  
     Transport.send(message);  
     System.out.println("message sent successfully....");  

    }catch (MessagingException mex) {mex.printStackTrace();}  
   }  
 }  

---

你想用gmail smtp发送电子邮件，所以你必须这样配置它

    import java.util.Properties;

    import javax.mail.Message;
    import javax.mail.MessagingException;
    import javax.mail.PasswordAuthentication;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;

    public class SendeMails {

/***
*    gmail via TLS
*
**/
/*
    public static void main(String[] args) {

        final String username = "username@gmail.com";
        final String password = "password";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");

        Session session = Session.getInstance(props,
          new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
          });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("username@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("to@gmail.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler,"
                + "\n\n No spam to my email, please!");

            javax.mail.Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
*/  
/***
*    gmail via SSL
*
**/
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("username","password");
                }
            });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("from@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("to@no-spam.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler," +
                    "\n\n No spam to my email, please!");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
    }

---

下面的代码适用于我。别忘了

activation.jar、java-mail-1.4.4.jar、javamail-smtp-1.4.2.jar、mail-6.0.0-sources.jar，我用过的

代码

---

注意：-检查您的internet连接

您的计算机上是否运行SMTP服务器？我可以知道如何添加和运行此程序吗，我正在从Eclipse执行此程序如果需要，您必须安装、配置和运行SMTP服务器。或者你必须连接到一个远程服务器，这样一个服务器正在运行。要通过gmail发送电子邮件，你需要使用以下参数进行配置：对不起，Anptk，我尝试了这种方法，但没有引发异常。你添加了jar文件吗？我现在也检查了此代码………工作正常。。。。。。请填写有效的gmail凭证和收件人的邮件id。执行我的回答，别忘了在我的回答中发布异常，如果你发现当我运行时，我在主线程java.lang.RuntimeException:javax.mail.AuthenticationFailedException:454 4.7.0中出现此异常，请稍后再试。mx5sm8114555pdb.75-gsmtp请告诉我解决方案我现在的情况是这样的javax.mail.AuthenticationFailedException:无法连接请告诉我如何解决此问题