发送邮件错误,javax.mail.MessagingException:无法连接到 SMTP 主机:localhost,端口:25;
Sending mail error, javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
这是我的代码
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailSendClass {
public static void main (String [] args){
// Recipient's email ID needs to be mentioned.
String to = "abc82@gmail.com";
// Sender's email ID needs to be mentioned
String from = "xyz@gmail.com";
// Assuming you are sending email from localhost
String host = "localhost";
// 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("Thanks for registering on our website!");
// Now set the actual message
message.setText("Welcome To Job Portal !!!! Again Thanks ");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
mex.printStackTrace();
}
}
}
我每次都收到这个错误
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused: 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 MailSendClass.main(MailSendClass.java:58)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
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)
... 7 more
BUILD SUCCESSFUL (total time: 3 seconds)
我没有得到发生这种情况的错误。请帮我解决这个错误。
你应该看看这两行:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
Caused by: java.net.ConnectException: Connection refused: connect
错误是:"There is nothing listening on localhost at port 25".
您正在尝试使用 localhost:25 作为邮件服务器,但那里没有服务器。
您应该使用免费的 Google SMTP 服务器作为测试。
mail.host=smtp.gmail.com
mail.username=//your gmail
mail.password=//your password
mail.defaultEncoding=UTF-8
mail.smtp.auth=true
mail.smtp.starttls.required=true
mail.smtp.starttls.enable=true
mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
mail.smtp.socketFactory.fallback=false
mail.smtp.port=465
mail.smtp.socketFactory.port=465
接下来,使用您的 gmail 登录,然后开启 less secure apps。
错误不言自明:javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
您在本地主机上没有 SMTP 服务器,但您在那里配置它:
// Assuming you are sending email from localhost
String host = "localhost";
...
// Setup mail server
properties.setProperty("mail.smtp.host", host);
所以你必须:
- 将本地 SMTP 服务器配置为本地系统上的中继(Postfix 或 sendmail 是两个众所周知的服务器)
- 配置一个虚拟服务器,它只跟踪邮件请求但甚至不尝试投递邮件(Python 已知有这种开箱即用的虚拟服务器)
- 或使用允许您使用的服务器配置您的应用程序 - 在公司环境中联系您的系统管理员,或在个人环境中联系您的 ISP。不管怎样,你甚至需要它来配置一个真正的继电器。
兄弟,这是可行的解决方案。保证
1) 首先打开您要发送邮件的 gmail 帐户,例如您的情况“"xyz@gmail.com"
2) 打开下面这个 link
https://support.google.com/accounts/answer/6010255?hl=en
3) 单击“我的帐户”中的“"Go to the "安全性较低的应用程序”部分。选项
4) 然后开机
5) 就是这样 (:
只需使用这个提供的解决方案:javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25
并确保在您的 google 帐户上开启不太安全的应用程序访问。
这是我的代码
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailSendClass {
public static void main (String [] args){
// Recipient's email ID needs to be mentioned.
String to = "abc82@gmail.com";
// Sender's email ID needs to be mentioned
String from = "xyz@gmail.com";
// Assuming you are sending email from localhost
String host = "localhost";
// 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("Thanks for registering on our website!");
// Now set the actual message
message.setText("Welcome To Job Portal !!!! Again Thanks ");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
mex.printStackTrace();
}
}
}
我每次都收到这个错误
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused: 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 MailSendClass.main(MailSendClass.java:58)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
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)
... 7 more
BUILD SUCCESSFUL (total time: 3 seconds)
我没有得到发生这种情况的错误。请帮我解决这个错误。
你应该看看这两行:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
Caused by: java.net.ConnectException: Connection refused: connect
错误是:"There is nothing listening on localhost at port 25".
您正在尝试使用 localhost:25 作为邮件服务器,但那里没有服务器。
您应该使用免费的 Google SMTP 服务器作为测试。
mail.host=smtp.gmail.com
mail.username=//your gmail
mail.password=//your password
mail.defaultEncoding=UTF-8
mail.smtp.auth=true
mail.smtp.starttls.required=true
mail.smtp.starttls.enable=true
mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
mail.smtp.socketFactory.fallback=false
mail.smtp.port=465
mail.smtp.socketFactory.port=465
接下来,使用您的 gmail 登录,然后开启 less secure apps。
错误不言自明:javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
您在本地主机上没有 SMTP 服务器,但您在那里配置它:
// Assuming you are sending email from localhost
String host = "localhost";
...
// Setup mail server
properties.setProperty("mail.smtp.host", host);
所以你必须:
- 将本地 SMTP 服务器配置为本地系统上的中继(Postfix 或 sendmail 是两个众所周知的服务器)
- 配置一个虚拟服务器,它只跟踪邮件请求但甚至不尝试投递邮件(Python 已知有这种开箱即用的虚拟服务器)
- 或使用允许您使用的服务器配置您的应用程序 - 在公司环境中联系您的系统管理员,或在个人环境中联系您的 ISP。不管怎样,你甚至需要它来配置一个真正的继电器。
兄弟,这是可行的解决方案。保证
1) 首先打开您要发送邮件的 gmail 帐户,例如您的情况“"xyz@gmail.com"
2) 打开下面这个 link https://support.google.com/accounts/answer/6010255?hl=en
3) 单击“我的帐户”中的“"Go to the "安全性较低的应用程序”部分。选项
4) 然后开机
5) 就是这样 (:
只需使用这个提供的解决方案:javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25
并确保在您的 google 帐户上开启不太安全的应用程序访问。