Spring MVC邮件连接超时异常

Question

我在eclipse IDE中使用Spring Mail尝试发送电子邮件，但控制台总是打印“连接超时”异常。我已经确认可以通过telnet连接到邮件服务器。我对Spring MVC框架相当陌生。可能是因为我没有配置spring mvc。xml对吗？不过，我没有在代码中使用依赖项注入。以下是代码和例外情况。感谢您的宝贵意见。

package xxx.web.controller;
import java.io.File; 
import java.util.Properties;
import javax.servlet.http.HttpServletRequest;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import org.springframework.core.io.FileSystemResource; 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.mail.MailException;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl; 
import org.springframework.mail.javamail.MimeMessageHelper;

@Controller
public class SendMailController {

 private JavaMailSenderImpl mailSender;

 @RequestMapping(value ="/sendMail", method = RequestMethod.GET) 
 public void sendMail(HttpServletRequest request) throws MessagingException{
  mailSender = new JavaMailSenderImpl();
  mailSender.setHost("smtp.sina.com");  //configure mail server
  mailSender.setUsername("**********@sina.com");
  mailSender.setPassword("*******");

  MimeMessage msg = mailSender.createMimeMessage();
  MimeMessageHelper msgHelper = new MimeMessageHelper(msg, true, "utf-8");

  msgHelper.setTo("********@qq.com");
  msgHelper.setFrom("*********@sina.com");
  msgHelper.setSubject("Testing Subject");
  msgHelper.setText("This is a test mail!");

  FileSystemResource file = new FileSystemResource(new File("D:/test.png"));
  msgHelper.addAttachment("test.png", file); //add an attachment

  Properties prop = new Properties();
  prop.put("mail.smtp.auth", "true");
  prop.put("mail.smtp.timeout", "25000"); 
  mailSender.setJavaMailProperties(prop);
  mailSender.send(msg);

  System.out.println("Email sent successfully！");
 }
}

在控制台中打印的异常：

消息请求处理失败；嵌套的异常是org。springframework。邮政MailSendException:邮件服务器连接失败；嵌套的异常是com。太阳邮政util。MailConnectException：**

无法连接到主机，端口：smtp.sina.com，25；超时-1；

**

描述服务器遇到了一个内部错误，使其无法满足此请求。

例外

组织。springframework。网状物util。NestedServletException:请求处理失败；嵌套的异常是org。springframework。邮政MailSendException:邮件服务器连接失败；嵌套的异常是com。太阳邮政util。MailConnectException:无法连接到主机，端口：smtp。新浪。com，25岁；超时-1；嵌套的例外是：java。网ConnectException:连接超时：连接。失败消息：com。太阳邮政util。MailConnectException:无法连接到主机，端口：smtp。新浪。com，25岁；超时-1；嵌套的例外是：java。网连接异常：连接超时：连接；消息异常（1）为：失败消息1:com。太阳邮政util。MailConnectException:无法连接到主机，端口：smtp。新浪。com，25岁；超时-1；嵌套的例外是：java。网连接异常：连接超时：连接组织。springframework。网状物servlet。FrameworkServlet。processRequest（FrameworkServlet.java:948）org。springframework。网状物servlet。FrameworkServlet。doGet（FrameworkServlet.java:827）javax。servlet。http。HttpServlet。服务（HttpServlet.java:620）组织。springframework。网状物servlet。FrameworkServlet。服务（FrameworkServlet.java:812）javax。servlet。http。HttpServlet。服务（HttpServlet.java:727）org。阿帕奇。公猫websocket。服务器WsFilter。doFilter（WsFilter.java:52）org。springframework。网状物滤器字符编码过滤器。doFilterInternal（CharacterEncodingFilter.java:88）org。springframework。网状物滤器OncePerRequestFilter。doFilter（OncePerRequestFilter.java:107）

Answer 1

首先，你必须确保你的连接正常；要进行检查，请打开命令行并执行以下命令：

telnet <yourservername> smtp

HELO <yourservername and then enter>

MAIL from: <mailaddr and then enter>

RCPT to: <mailaddr and then enter>
DATA
354 End data with <CR><LF>.<CR><LF>
From: <mailaddr and then enter>
To: <mailaddr and then enter>
Subject: test

This is test
.
250 2.0.0 Ok: queued as 4C67244003
QUIT  <and then enter>
221 2.0.0 Bye
Connection closed by foreign host.

如果一切正常，那么这是Spring的问题，或者您需要在邮件服务器上进行身份验证（或者更简单地说，您的邮件服务器不允许在其自身网络之外进行连接）

安杰洛