無法使用JavaMail發送任何郵件

Question

我想使用Java發送郵件，但是在本教程http://www.tutorialspoint.com/java/java_sending_email.htm上無法正常使用。

這是我的主要方法

public static void main(String[] args) {
        // Recipient's email ID needs to be mentioned.
      String to = "abcd@gmail.com";

      // Sender's email ID needs to be mentioned
      String from = "web@gmail.com";

      // Assuming you are sending email from localhost
      String host = "localhost";

      // Get system properties
      Properties properties = System.getProperties();

      // Setup mail server
      properties.setProperty("smtp.laposte.net", host);

      // Get the default Session object.
      Session session = Session.getDefaultInstance(properties);

      try{
         // Create a default MimeMessage object.
         MimeMessage message = new MimeMessage(session);

         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.
         message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

         // Set Subject: header field
         message.setSubject("This is the Subject Line!");

         // Now set the actual message
         message.setText("This is actual message");

         // Send message
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
    }

我有下面的錯誤：

javax.mail.MessagingException：無法連接到SMTP主機：localhost，端口：25； 嵌套的異常是：java.net.ConnectException：拒絕連接：在com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java :)上的com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1972）連接642）在javax.mail.Service.connect（Service.java:295）在javax.mail.Service.connect（Service.java:176）在javax.mail.Service.connect（Service.java:125）在javax。 mail.Transport.send0（Transport.java:194）（位於javax.mail.Transport.send（Transport.java:124）（位於javamail.JavaMail.main（JavaMail.java:58）））原因：java.net.ConnectException：Connection拒絕：在java.net處的java.net.DualStackPlainSocketImpl.socketConnect（DualStackPlainSocketImpl.java:79）處的java.net.DualStackPlainSocketImpl.connect0（本機方法）處進行連接。在Java.net處進行連接。 java.net上的AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:206）java.net.PlainSocketImpl.connec上的AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:188） 在java.net.Socket.connect（Socket.java）上的java.net.SocksSocketImpl.connect（SocksSocketImpl.java:392）上的t（PlainSocketImpl.java:172）在java.net.Socket.connect（Socket.java:589）處：538.com.com.sun.mail.util.SocketFetcher.createSocket（SocketFetcher.java:319）com.sun.mail.util.SocketFetcher.getSocket（SocketFetcher.java:233）com.sun.mail.smtp。 SMTPTransport.openServer（SMTPTransport.java:1938）...另外7個BUILD SUCCESSFUL（總時間：1秒）

Answer 1

主機使用錯誤

host="smtp.gmail.com";

如果您使用的是Gmail ID發送郵件。 那么您需要打開gmail從extrnel應用程序為用戶發送郵件。 請按照以下鏈接https://support.google.com/a/answer/57919?hl=zh-CN打開，然后重試。

Answer 2

您還可以使用spring發送郵件。

bean.xml

<bean id="myMailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="smtp.gmail.com" />
        <property name="port" value="587" />
        <property name="username" value="<user_name>" />
        <property name="password" value="<password>" />

        <!-- The name of the property, following JavaBean naming conventions -->
        <property name="javaMailProperties">
            <props>
                <prop key="mail.transport.protocol">smtp</prop>
                <prop key="mail.smtp.auth">true</prop>
                <prop key="mail.smtp.starttls.enable">true</prop>
                <prop key="mail.debug">true</prop>
            </props>
        </property>
    </bean>

。

@Service("myMail")
    public class myMailApi {

        @Autowired
        private MailSender myMailSender;

        public void sendMail(String to,String from,String subject, String body){
            SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
            simpleMailMessage.setTo(to);
            simpleMailMessage.setFrom(from);
            simpleMailMessage.setSubject(subject);
            simpleMailMessage.setText(body);
            myMailSender.send(simpleMailMessage);
        }
    }



private static void sendMailClient() {
        String mailXml = "mail-bean.xml";
        ApplicationContext context = new ClassPathXmlApplicationContext(mailXml);
        myMailApi mailBean = (mmyMailApi) context
                .getBean("myMail");
        mailBean.sendMail("<to>",
                "<from>", "<subject>", "<body>");
    }

Answer 3

我可以使用哪個服務器在沒有帳戶的情況下發送電子郵件並登錄Java Mail api？ Hotmail是否可以在不登錄Java郵件的情況下自動發送電子郵件？