无法连接到SMTP主机：smtp.gmail.com，端口：587;嵌套的异常是：java.net.ConnectException：连接超时：connect [英] Could not connect to SMTP host: smtp.gmail.com, port: 587; nested exception is: java.net.ConnectException: Connection timed out: connect
问题描述
这是应用程序的代码。我一直试图使用Eclipse IDE来运行它。我还添加了所有必需的Java邮件jar文件，即
dsn.jar，imap.jar，mailapi.jar，pop3.jar，smtp.jar，mail.jar 。
但它给出以下错误无法连接到SMTP主机：smtp.gmail.com，端口：587 。
Here is the code of the application. I have been trying to run this using eclipse IDE. I also added all the required java mail jar files namely
dsn.jar,imap.jar,mailapi.jar,pop3.jar,smtp.jar,mail.jar.
But it gives the following error Could not connect to SMTP host: smtp.gmail.com, port: 587.
没有防火墙阻止访问，因为在ping smtp.gmail.com时收到了回复。
我什至尝试过这种方式：
There's no firewall blocking access because a reply is received on pinging smtp.gmail.com. I have even tried it this way :
- 首先在您要设置的设备上的浏览器中登录Gmail帐户/使用您的客户端
- 转到此处启用对安全性较低应用的访问权限： https://www.google.com/settings/security/lesssecureapps
- 然后转到此处： https://accounts.google.com/b/0/DisplayUnlockCaptcha 并点击继续。
- 然后直接回到您的客户端，然后重试。
- First sign into the Gmail account in a browser on the device where you are setting up/using your client
- Go here and enable access for "less secure" apps: https://www.google.com/settings/security/lesssecureapps
- Then go here: https://accounts.google.com/b/0/DisplayUnlockCaptcha and click Continue.
- Then straightaway go back to your client and try again.
javax.mail.MessagingException：无法连接到SMTP主机：
smtp.gmail.com，端口：587;
嵌套的异常是：
java.net.ConnectException：连接超时：在com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1972）上连接
在com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java:642）在javax.mail.Service.connect（Service.java:317）
在javax.mail.Service.connect在
（Service.java:176）
在javax.mail.Service.connect（Service.java:125）
在javax.mail.Transport.send0（Transport.java:194）
在javax.mail.Transport.send（Transport.java:124）
在PlainTextEmailSender.sendPlainTextEmail（PlainTextEmailSender.java:50）
在PlainTextEmailSender.main（PlainTextEmailSender.java:73）
由：java.net.ConnectException：连接超时：java.net.DualStackPlainSocketImpl.connect0（本机方法）连接
java.net.DualStackPlainSocketImpl.socketConnect（本地方法）
java 。净。 java.net上的AbstractPlainSocketImpl.doConnect（未知源）
java.net上的AbstractPlainSocketImpl.connectToAddress（未知源） connect（未知源）
在java.net.SocksSocketImpl.connect（未知源）
在java.net.Socket.connect（未知源）
在java.net.Socket.connect（未知来源）com.sun.mail.util.SocketFetcher.createSocket（SocketFetcher.java:319）的
com.sun.mail.util.SocketFetcher.getSocket（SocketFetcher.java:233）的
b $ b com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1938）
javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587; nested exception is: java.net.ConnectException: Connection timed out: connect at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1972) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:642) at javax.mail.Service.connect(Service.java:317) at javax.mail.Service.connect(Service.java:176) at javax.mail.Service.connect(Service.java:125) at javax.mail.Transport.send0(Transport.java:194) at javax.mail.Transport.send(Transport.java:124) at PlainTextEmailSender.sendPlainTextEmail(PlainTextEmailSender.java:50) at PlainTextEmailSender.main(PlainTextEmailSender.java:73) 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:319) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:233) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1938)
package net.codejava.mail;
import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class PlainTextEmailSender {
public void sendPlainTextEmail(String host, String port,
final String userName, final String password, String toAddress,
String subject, String message) throws AddressException,
MessagingException {
// sets SMTP server properties
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");
// creates a new session with an authenticator
Authenticator auth = new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(userName, password);
}
};
Session session = Session.getInstance(properties, auth);
// creates a new e-mail message
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());
// set plain text message
msg.setText(message);
// sends the e-mail
Transport.send(msg);
}
/**
* Test the send e-mail method
*
*/
public static void main(String[] args) {
// SMTP server information
String host = "smtp.gmail.com";
String port = "587";
String mailFrom = "user_name";
String password = "password";
// outgoing message information
String mailTo = "email_address";
String subject = "Hello my friend";
String message = "Hi guy, Hope you are doing well. Duke.";
PlainTextEmailSender mailer = new PlainTextEmailSender();
try {
mailer.sendPlainTextEmail(host, port, mailFrom, password, mailTo,
subject, message);
System.out.println("Email sent.");
} catch (Exception ex) {
System.out.println("Failed to sent email.");
ex.printStackTrace();
}
}
}
推荐答案
正如我所说，您的代码没有错。如果有的话，只是做一些测试，尝试删除Authentication部分，看看是否可行：
As I said, there's nothing wrong with your code. If anything, just to do some testing, try to drop the Authentication part to see if that works:
public void sendPlainTextEmail(String host, String port,
final String userName, final String password, String toAddress,
String subject, String message) throws AddressException,
MessagingException {
// sets SMTP server properties
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");
// *** BEGIN CHANGE
properties.put("mail.smtp.user", userName);
// creates a new session, no Authenticator (will connect() later)
Session session = Session.getDefaultInstance(properties);
// *** END CHANGE
// creates a new e-mail message
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());
// set plain text message
msg.setText(message);
// *** BEGIN CHANGE
// sends the e-mail
Transport t = session.getTransport("smtp");
t.connect(userName, password);
t.sendMessage(msg, msg.getAllRecipients());
t.close();
// *** END CHANGE
}
我每天使用的代码从我的应用程序发送数十封电子邮件，并且保证100％有效-只要 smtp.gmail.com:587 是可以到达的。
That's the code I'm using every day to send dozens of emails from my application, and it is 100% guaranteed to work -- as long as smtp.gmail.com:587 is reachable, of course.
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