java如果邮件服务器连接失败,我们重新连接3次。
时间: 2024-02-05 22:10:21 浏览: 52
你可以使用 JavaMail API 来连接邮件服务器并发送邮件。在连接邮件服务器时,你可以使用一个循环,尝试连接邮件服务器并发送邮件。如果连接失败,你可以在循环中重新尝试连接邮件服务器。以下是一个示例代码:
```java
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;
public class MailSender {
private static final int MAX_ATTEMPTS = 3;
public void sendMail(String recipient, String subject, String body) {
Properties props = new Properties();
props.put("mail.smtp.host", "your_mail_server");
props.put("mail.smtp.port", "your_mail_server_port");
Session session = Session.getInstance(props, null);
int attempts = 0;
boolean success = false;
while (!success && attempts < MAX_ATTEMPTS) {
try {
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("your_email_address"));
msg.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(recipient, false));
msg.setSubject(subject);
msg.setText(body);
Transport.send(msg);
success = true;
} catch (MessagingException e) {
attempts++;
System.out.println("Failed to send email: " + e.getMessage());
System.out.println("Retrying connection... (attempt " + attempts + ")");
}
}
if (!success) {
System.out.println("Failed to send email after " + MAX_ATTEMPTS + " attempts.");
}
}
}
```
在上述代码中,我们使用了一个名为 `MAX_ATTEMPTS` 的常量,它定义了我们最多尝试连接邮件服务器的次数。在 `sendMail()` 方法内部,我们使用一个 while 循环来尝试连接邮件服务器和发送邮件。如果连接或发送失败,则增加尝试次数并重新尝试连接邮件服务器。如果我们超过了最大尝试次数,我们将打印一条错误消息。