javax.mail.MessagingException：

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 = "[e-mail]";//change accordingly String from = "[e-mail]";//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中得到Exception。 无法连接到SMTP主机：localhost，port：25嵌套exception是：java.net.ConnectException：连接被拒绝：连接。 那么解决方案是什么？

我在这里发布了正确的代码，用于通过struts 2中的gmail发送邮件。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"; } } 

Answer 1

你忘记了两个步骤：

• 你的密码

• 认证者

此外，也许您没有任何本地邮件服务器监听本地主机上的端口25（javax.mail.MessagingException）。

在这里，我使用端口587。

所以试试这个代码：

 import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Message; import javax.mail.PasswordAuthentication; import javax.mail.SendFailedException; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SampleMail { public static void main(String [] args) throws Exception { final String from = "[e-mail]"; // change accordingly final String password = "yourPassword"; // change accordingly String to = "[e-mail]"; // change accordingly String host = "localhost"; // or IP address // Get system properties Properties properties = System.getProperties(); // Setup mail server properties.put("mail.smtp.host", host); properties.put("mail.smtp.port", 587); properties.put("mail.smtp.auth", "true"); properties.put("mail.smtp.starttls.enable", "true"); properties.put("mail.user", from); properties.put("mail.password", password); // Get the default Session object. Authenticator auth = new Authenticator() { public PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(from, password); } }; Session session = Session.getInstance(properties, auth); 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(); } } } 

我使用此代码，如果这可以帮助您：

 import java.util.Date; import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Message; import javax.mail.Multipart; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeBodyPart; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMultipart; class SampleMail { public static void main(String args[]) throws Exception { new Email("yourEmail(sendTheMessage)", "yourEmailPassword", "yourEmail(recvTheMessage)", "subject", "message"); // Send a message String[] attachments = {"/home/user/Documents/text.odt"}; new Email("yourEmail(sendTheMessage)", "yourEmailPassword", "yourEmail(recvTheMessage)", "subject", "message", attachments); // send a message with attachments } } class Email { private String host, port = "587"; Email(String mailFrom, String password, String mailTo, String subject, String message) throws Exception { if (mailFrom.contains("@gmail")) this.host = "smtp.gmail.com"; else if (mailFrom.contains("@yahoo")) this.host = "smtp.mail.yahoo.com"; else this.host = "smtp.live.com"; sendEmail(host, port, mailFrom, password, mailTo, subject, message, null); } Email(String mailFrom, String password, String mailTo, String subject, String message, String[] attachFiles) throws Exception { if (mailFrom.contains("@gmail")) this.host = "smtp.gmail.com"; else if (mailFrom.contains("@yahoo")) this.host = "smtp.mail.yahoo.com"; else this.host = "smtp.live.com"; sendEmail(host, port, mailFrom, password, mailTo, subject, message, attachFiles); } private void sendEmail(String host, String port, final String userName, final String password, String toAddress, String subject, String message, String[] attachFiles) throws Exception { Properties properties = new Properties(); properties.put("mail.smtp.host", host); properties.put("mail.smtp.port", port); properties.put("mail.smtp.auth", "true"); properties.put("mail.smtp.starttls.enable", "true"); properties.put("mail.user", userName); properties.put("mail.password", password); Authenticator auth = new Authenticator() { public PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(userName, password); } }; Session session = Session.getInstance(properties, auth); Message msg = new MimeMessage(session); msg.setFrom(new InternetAddress(userName)); InternetAddress[] toAddresses = {new InternetAddress(toAddress)}; msg.setRecipients(Message.RecipientType.TO, toAddresses); msg.setSubject(subject); msg.setSentDate(new Date()); MimeBodyPart messageBodyPart = new MimeBodyPart(); messageBodyPart.setContent(message, "text/html"); Multipart multipart = new MimeMultipart(); multipart.addBodyPart(messageBodyPart); if (attachFiles != null && attachFiles.length > 0) { for (String filePath : attachFiles) { MimeBodyPart attachPart = new MimeBodyPart(); try { attachPart.attachFile(filePath); } finally { multipart.addBodyPart(attachPart); } } } msg.setContent(multipart); Transport.send(msg); } } 

但在这里，您必须更改主机以允许其他内容而不是gmail，yahoo或hotmail帐户。