我已经写了一段用于发送邮件的代码（smtp，tls enabled）。当我的m / c（运行此代码）连接到任何商业网络时，它工作正常。但是，当我在办公室（公司网络）时，我在执行相同代码时收到以下错误：
javax.mail.MessagingException: Could not connect to SMTP host: smtp.office365.com, port: 587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1545)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:453)
at javax.mail.Service.connect(Service.java:291)
at javax.mail.Service.connect(Service.java:172)
at Mailer.sendEmail(Mailer.java:129)
at Mailer.main(Mailer.java:36)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:267)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:227)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1511)
为了进一步分析，我采用了网络跟踪（wireshark），我看到服务器没有响应客户端发送的TCP SYN（这里是我的代码）。据我所知，这可能是由于网络防火墙或其他网络策略执行功能造成的。
你有什么想法，我怎么能在这方面取得进展？
以下是代码：
/ * *描述：该类提供电子邮件生成和发送逻辑。 * @version |日期：0.1 | 2017年1月29日 * /
import java.io.IOException;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.util.concurrent.ThreadLocalRandom;
public class Mailer
{
Session mailSession;
public static void main(String args[]) throws AddressException, MessagingException, IOException
{
Mailer javaEmail = new Mailer();
javaEmail.setMailServerProperties();
javaEmail.draftEmailMessage();
javaEmail.sendEmail();
}
private void setMailServerProperties()
{
Properties emailProperties = System.getProperties();
emailProperties.put("mail.smtp.port", "587");
emailProperties.put("mail.smtp.auth", "true");
emailProperties.put("mail.debug", "true");
emailProperties.put("mail.smtp.starttls.enable", "true");
emailProperties.put("mail.smtp.socketFactory.port", "587");
emailProperties.put("mail.smtp.socketFactory.fallback", "false");
mailSession = Session.getDefaultInstance(emailProperties, null);
}
private MimeMessage draftEmailMessage() throws AddressException, MessagingException, IOException
{
String[] toEmails = { "x.y@dd.com","xxyy@gmail.com" };
Address addRess = new InternetAddress("sender@dd.com");
Address[] fromAddress = {addRess};
String emailSubject = "Import update";
String emailBody = "whether is called";
MimeMessage emailMessage = new MimeMessage(mailSession);
/**
* Set the mail recipients
* */
for (int i = 0; i < toEmails.length; i++)
{
emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmails[i]));
}
emailMessage.addFrom(fromAddress);
emailMessage.setSubject(emailSubject);
/**
* If sending HTML mail
* */
// Create the message part
MimeBodyPart messageBodyPart = new MimeBodyPart();
// Now set the actual message
messageBodyPart.setText("This is Will be the meessage body");
// Create a multipart message
Multipart multipart = new MimeMultipart();
// Set text message part
multipart.addBodyPart(messageBodyPart);
// Part two is attachment
messageBodyPart = new MimeBodyPart();
String filename = "D:\\Tradfri.java";
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);
// Part three is the embedded body
messageBodyPart = new MimeBodyPart();
String cid = (Integer.toString(ThreadLocalRandom.current().nextInt(1, 60000 + 1)));
System.out.println("CID is " + cid);
messageBodyPart.setText(""
+ "<html>"
+ " <body>"
+ " <p>Here is my image:</p>"
+ " <img src=\"cid:" + cid + "\" />"
+ " </body>"
+ "</html>",
"US-ASCII", "html");
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
messageBodyPart.attachFile("C:\\Users\\MyPlace\\Pictures\\ww.png");
messageBodyPart.setContentID("<" + cid + ">");
messageBodyPart.setDisposition(MimeBodyPart.INLINE);
multipart.addBodyPart(messageBodyPart);
// Send the complete message parts
emailMessage.setContent(multipart);
return emailMessage;
}
private void sendEmail() throws AddressException, MessagingException, IOException
{
/**
* Sender's credentials
* */
String fromUser = "sender@dd.com";
String fromUserEmailPassword = "(XXXXXX1@)";
String emailHost = "smtp.office365.com";
Transport transport = mailSession.getTransport("smtp");
transport.connect(emailHost, fromUser, fromUserEmailPassword);
/*
* Draft the message
* */
MimeMessage emailMessage = draftEmailMessage();
/**
* Send the mail
* */
transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
transport.close();
System.out.println("Email sent successfully.");
}
}
提前致谢!!
答案 0 :(得分：0)
您可能需要配置Java邮件以通过代理服务器进行连接。
请注意，Java邮件不支持HTTP代理，因此您必须将其配置为使用SOCKS代理。
如果您的公司网络没有启用SOCKS代理，那么可以选择其他方式：
答案 1 :(得分：0)
就我而言，Avast Anti-Virus不允许我连接。这些类型的软件可能是导致这些类型错误的原因。