email - 用java发送电子邮件

Question

我正在创建一个应用程序，我想在其中向我的客户发送电子邮件。当我编译下面的代码时，它没问题，但是当我运行时，它给出了如下错误

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

public class SendEmail
{
   public static void main(String [] args)
   {   

     String to = "prakash_d22@rediffmail.com";    
      String from = "web@gmail.com";    
      String host = "localhost";    
      Properties properties = System.getProperties();    
      properties.setProperty("smtp.gmail.com", host);   
          Session session = Session.getDefaultInstance(properties); 
      try{         
         MimeMessage message = new MimeMessage(session);     
         message.setFrom(new InternetAddress(from));        
         message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));      
         message.setSubject("This is the Subject Line!");        
         message.setText("This is actual message");       
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}

错误:

请指导我。

Answer 1

            String host = "smtp.gmail.com";

            Properties properties = new Properties();

设置以下属性

        properties .put("mail.smtp.starttls.enable", "true");
        properties .put("mail.smtp.host", host);
        properties .put("mail.smtp.user", username);
        properties .put("mail.smtp.password", password);
        properties .put("mail.smtp.port", "587");
        properties .put("mail.smtp.auth", "true");