我使用java邮件发送邮件，我遇到了这个错误：javax.mail.MessagingException：无法连接到SMTP主机：103.12.134.112，port：25; 我已经看到了相关的问题，但它不适合我，使用窗口8.请提前帮助我，谢谢。
package com.airportbookingvn;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Message;
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;
import javax.mail.util.ByteArrayDataSource;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;
/**
* Email with PDF example.
* <br><br>
* Email sending code adapted from http://www.java-tips.org/other-api-tips/javamail/how-to-send-an-email-with-a-file-attachment.html.
* @author Jee Vang
*
*/
public class SendAttachment {
/**
* Sends an email with a PDF attachment.
*/
public void email() {
String smtpHost = "103.12.134.112"; //replace this with a valid host
int smtpPort = 25; //replace this with a valid port
String sender = "sender@yourhost.com"; //replace this with a valid sender email address
String recipient = "recipient@anotherhost.com"; //replace this with a valid recipient email address
String content = "dummy content"; //this will be the text of the email
String subject = "dummy subject"; //this will be the subject of the email
Properties properties = new Properties();
properties.put("mail.smtp.host", smtpHost);
properties.put("mail.smtp.port", smtpPort);
Session session = Session.getDefaultInstance(properties, null);
ByteArrayOutputStream outputStream = null;
try {
//construct the text body part
MimeBodyPart textBodyPart = new MimeBodyPart();
textBodyPart.setText(content);
//now write the PDF content to the output stream
outputStream = new ByteArrayOutputStream();
writePdf(outputStream);
byte[] bytes = outputStream.toByteArray();
//construct the pdf body part
DataSource dataSource = new ByteArrayDataSource(bytes, "application/pdf");
MimeBodyPart pdfBodyPart = new MimeBodyPart();
pdfBodyPart.setDataHandler(new DataHandler(dataSource));
pdfBodyPart.setFileName("test.pdf");
//construct the mime multi part
MimeMultipart mimeMultipart = new MimeMultipart();
mimeMultipart.addBodyPart(textBodyPart);
mimeMultipart.addBodyPart(pdfBodyPart);
//create the sender/recipient addresses
InternetAddress iaSender = new InternetAddress(sender);
InternetAddress iaRecipient = new InternetAddress(recipient);
//construct the mime message
MimeMessage mimeMessage = new MimeMessage(session);
mimeMessage.setSender(iaSender);
mimeMessage.setSubject(subject);
mimeMessage.setRecipient(Message.RecipientType.TO, iaRecipient);
mimeMessage.setContent(mimeMultipart);
//send off the email
Transport.send(mimeMessage);
System.out.println("sent from " + sender +
", to " + recipient +
"; server = " + smtpHost + ", port = " + smtpPort);
} catch(Exception ex) {
ex.printStackTrace();
} finally {
//clean off
if(null != outputStream) {
try { outputStream.close(); outputStream = null; }
catch(Exception ex) { }
}
}
}
/**
* Writes the content of a PDF file (using iText API)
* to the {@link OutputStream}.
* @param outputStream {@link OutputStream}.
* @throws Exception
*/
public void writePdf(OutputStream outputStream) throws Exception {
Document document = new Document();
PdfWriter.getInstance(document, outputStream);
document.open();
document.addTitle("Test PDF");
document.addSubject("Testing email PDF");
document.addKeywords("iText, email");
document.addAuthor("Jee Vang");
document.addCreator("Jee Vang");
Paragraph paragraph = new Paragraph();
paragraph.add(new Chunk("hello!"));
document.add(paragraph);
document.close();
}
/**
* Main method.
* @param args No args required.
*/
public static void main(String[] args) {
SendAttachment demo = new SendAttachment();
demo.email();
}
}
ERROR :
javax.mail.MessagingException: Could not connect to SMTP host: 103.12.134.112, port: 25;
nested exception is:
java.net.ConnectException: Connection timed out: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1706)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:525)
at javax.mail.Service.connect(Service.java:291)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at com.airportbookingvn.SendAttachment.email(SendAttachment.java:89)
at com.airportbookingvn.SendAttachment.main(SendAttachment.java:136)
Caused by: java.net.ConnectException: Connection timed out: 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:284)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:227)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1672)
... 8 more
答案 0 :(得分：0)
目前没有smtp服务器在103.12.134.112端口25监听（我刚检查过）
您可以使用telnet进行检查。有关详细信息，请参阅balanv的回答https://stackoverflow.com/a/11988455/3536342。