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javax.mail.MessagingException :

转载 作者：塔克拉玛干 更新时间：2023-11-02 19:59:00 27 4
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package com.mca2b;
import java.util.Properties;
import javax.mail.util.*;
import javax.mail.*;  
import javax.mail.internet.*;  
import javax.activation.*;  


public class SampleMail 
{
     public static void main(String [] args) throws Exception{  
          String to = "kalgaonkarsiddhesh@gmail.com";//change accordingly  
          String from = "siddhesh.kalgaonkar@ves.ac.in";//change accordingly  
          String host = "localhost";//or IP address  
          // Get system properties
          Properties properties = System.getProperties();

          // Setup mail server
          properties.setProperty("mail.smtp.host", 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 (SendFailedException mex) {
             mex.printStackTrace();
          }

     }  

}

我在线程“main”javax.mail.MessagingException 中遇到异常。无法连接到 SMTP 主机:localhost，端口:25 嵌套异常是:java.net.ConnectException:连接被拒绝:连接。那么解决方案是什么？

我在这里发布了在 struts 2 中通过 gmail 发送邮件的正确代码。对于不同的提供商，您必须相应地更改 SMTP 主机:)

package org.entity;

import com.opensymphony.xwork2.ActionSupport;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
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 DonorForgotAction extends ActionSupport
{
DonorForgot forg;
    public DonorForgotAction() {
    // TODO Auto-generated constructor stub
}
    public DonorForgot getForg() {
        return forg;
    }
    public void setForg(DonorForgot forg) {
        this.forg = forg;
    }
    @Override
    public String execute() throws Exception {
        String email,pass;
        final String username = "";
        final String 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 {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/foryou", "root", "siddheshkk");
            System.out.println("Driver Loaded");
            PreparedStatement ps = con
                    .prepareStatement("select email,password from donorinfo where contact=?");
            ps.setString(1, forg.getContact());
            ResultSet rs = ps.executeQuery();
            if (rs.next()) {
                email=rs.getString("email");
                pass=rs.getString("password");
                System.out.println("Here is your email id "+email+"and password is "+pass);
                try {
                    Message message = new MimeMessage(session);
                    message.setFrom(new InternetAddress(username));
                    message.setRecipients(Message.RecipientType.TO,
                        InternetAddress.parse(email));
                    message.setSubject("Password Retrieval");
                    message.setText("Dear user your password is "+ pass);
                    Transport.send(message);
                    System.out.println("Done");

                } catch (MessagingException e) {
                    e.printStackTrace();
                }
                return "success";
            } else {
                return "error";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "success";
    }

}

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