Question

我已经研究了该主题几天，但在网上找到的答案都没有对我有用。

上下文：我有一个Spring Boot Web应用程序，该应用程序使用Java Mail API和Spring Boot Starter Mail发送自动电子邮件通知。

它使用具有GSuite帐户的GMail SMTP服务器。我最近升级到使用Spring 5.0.6和Spring Boot 2.0.2，并且电子邮件发送停止了工作。

一些线索：

发送电子邮件的Java代码与以前相同
Gmail SMTP仍然可以正常工作（从使用相同设置和身份验证的较早版本应用程序的另一台VM正常发送电子邮件。
除非我丢失了某些内容，否则应用程序配置与以前相同

发生了变化的事情

升级到Spring 5.0.6
升级到Spring Boot 2.0.2
在Java代码中的许多地方进行了更改，以适应此升级并在应用程序的其他部分添加功能
VM的IP地址与以前不同（AWS EC2实例）

以下是pom.xml中的相关依赖项：

    <!-- https://mvnrepository.com/artifact/javax.mail/javax.mail-api -->
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>javax.mail-api</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId>
    </dependency>

以下是与Spring邮件相关的application.yml：

spring:
  mail:
    host: ${FT_MAIL_SMTP_HOST}
     port: ${FT_MAIL_SMTP_PORT}
     username: ${FT_MAIL_SMTP_USERNAME}
     password: ${FT_MAIL_SMTP_PASSWORD}
     debug: false
     properties:
       mail:
         smtp:
           starttls:
             enable: ${FT_MAIL_SMTP_STARTTLS}
             required: ${FT_MAIL_SMTP_TLSREQUIRED}
           auth: ${FT_MAIL_SMTP_AUTH}
           connectiontimeout: ${FT_MAIL_SMTP_CONN_TIMEOUT}
           timeout: ${FT_MAIL_SMTP_TIMEOUT}
           writetimeout: ${FT_MAIL_SMTP_WRITE_TIMEOUT}

这些变量是在环境中定义的：

FT_MAIL_SMTP_HOST=smtp.gmail.com
FT_MAIL_SMTP_PORT=587
FT_MAIL_SMTP_USERNAME=myaccount@myapp.com
FT_MAIL_SMTP_PASSWORD=mypassword

FT_MAIL_SMTP_STARTTLS=true
FT_MAIL_SMTP_TLSREQUIRED=true
FT_MAIL_SMTP_AUTH=true
FT_MAIL_SMTP_CONN_TIMEOUT=5000
FT_MAIL_SMTP_TIMEOUT=5000
FT_MAIL_SMTP_WRITE_TIMEOUT=5000

这是用于发送电子邮件（未更改）的Spring @Service：

@Service
public class EmailServiceImpl {

@Autowired
public JavaMailSender emailSender;

@Autowired
private SpringTemplateEngine templateEngine;

@Value("${myapp.mail.from}")
private String fromAddress;

@Value("${myapp.mail.replyto}")
private String replyToAddress;

public void sendTemplatedMessage(String template, String to, String subject, Map<String, Object> model) throws MailException, MessagingException {  
    sendTemplatedMessage(template, to, fromAddress, replyToAddress, subject, model);
}

public void sendTemplatedMessage(String template, String to, String from, String subject, Map<String, Object> model) throws MailException, MessagingException { 
    sendTemplatedMessage(template, to, from, replyToAddress, subject, model);
}

private void sendTemplatedMessage(String template, String to, String from, String replyTo, String subject, Map<String, Object> model) throws MailException, MessagingException {    

    MimeMessage message = emailSender.createMimeMessage();

    MimeMessageHelper helper = new MimeMessageHelper(message,
            MimeMessageHelper.MULTIPART_MODE_MIXED_RELATED,
            StandardCharsets.UTF_8.name());

    //helper.addAttachment("logo.png", new ClassPathResource("memorynotfound-logo.png"));
    Context context = new Context();
    context.setVariables(model);
    String html = templateEngine.process(template, context);

    helper.setTo(to);
    helper.setFrom(from);
    helper.setReplyTo(from);
    helper.setSubject(subject);
    helper.setText(html, true);

    emailSender.send(message);
}

public void sendSimpleMessage(String to, String from, String subject, String text) {
    try {           
        SimpleMailMessage message = new SimpleMailMessage(); 
        message.setTo(to);
        message.setFrom(from);
        message.setSubject(subject); 
        message.setText(text);
        emailSender.send(message);
    } catch (Exception e) {
        e.printStackTrace();
    }
}
}

现在这是我尝试发送电子邮件时遇到的错误：

04:42:19.900 [https-jsse-nio-443-exec-3] ERROR c.f.controller.StayController - Could not send Guest confirmation email to gfgorostidi@protonmail.com
org.springframework.mail.MailSendException: Failed to close server connection after message sending; nested exception is javax.mail.MessagingException: Exception reading response;
  nested exception is:
 java.net.SocketTimeoutException: Read timed out
 at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:482)
 at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:359)
 at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:354)
 at com.myapp.util.EmailServiceImpl.sendTemplatedMessage(EmailServiceImpl.java:61)
 at com.myapp.util.EmailServiceImpl.sendTemplatedMessage(EmailServiceImpl.java:35)
 at com.myapp.controller.StayController.sendConfirmEmailToGuest(StayController.java:437)
 at com.myapp.controller.StayController.saveStay(StayController.java:383)
 at com.myapp.controller.StayController.createStay(StayController.java:163)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 ......
 ......
 ......
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javax.mail.MessagingException: Exception reading response;
  nested exception is:
 java.net.SocketTimeoutException: Read timed out
 at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2202)
 at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1212)
 at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:473)
 ... 104 more
Caused by: java.net.SocketTimeoutException: Read timed out
 at java.base/java.net.SocketInputStream.socketRead0(Native Method)
 at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
 at java.base/java.net.SocketInputStream.read(SocketInputStream.java:171)
 at java.base/java.net.SocketInputStream.read(SocketInputStream.java:141)
 at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:425)
 at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(SSLSocketInputRecord.java:65)
 at java.base/sun.security.ssl.SSLSocketImpl.bytesInCompletePacket(SSLSocketImpl.java:918)
 at java.base/sun.security.ssl.AppInputStream.read(AppInputStream.java:144)
 at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:124)
 at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
 at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:271)
 at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
 at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2182)
 ... 106 more
org.springframework.mail.MailSendException: Failed to close server connection after message sending; nested exception is javax.mail.MessagingException: Exception reading response;
  nested exception is:
 java.net.SocketTimeoutException: Read timed out
 at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:482)
 at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:359)
 at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:354)
 at com.myapp.util.EmailServiceImpl.sendTemplatedMessage(EmailServiceImpl.java:61)
 at com.myapp.util.EmailServiceImpl.sendTemplatedMessage(EmailServiceImpl.java:35)
 at com.myapp.controller.StayController.sendConfirmEmailToGuest(StayController.java:437)
 at com.myapp.controller.StayController.saveStay(StayController.java:383)
 at com.myapp.controller.StayController.createStay(StayController.java:163)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 ......
 ......
 ......
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javax.mail.MessagingException: Exception reading response;
  nested exception is:
 java.net.SocketTimeoutException: Read timed out
 at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2202)
 at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1212)
 at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:473)
 ... 104 more
Caused by: java.net.SocketTimeoutException: Read timed out
 at java.base/java.net.SocketInputStream.socketRead0(Native Method)
 at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
 at java.base/java.net.SocketInputStream.read(SocketInputStream.java:171)
 at java.base/java.net.SocketInputStream.read(SocketInputStream.java:141)
 at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:425)
 at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(SSLSocketInputRecord.java:65)
 at java.base/sun.security.ssl.SSLSocketImpl.bytesInCompletePacket(SSLSocketImpl.java:918)
 at java.base/sun.security.ssl.AppInputStream.read(AppInputStream.java:144)
 at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:124)
 at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
 at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:271)
 at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
 at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2182)
 ... 106 more

我尝试设置不正确的SMTP服务器或错误的凭据，这使连接失败，因此我假设服务器和凭据保持正确，并且在成功连接后发生错误。

所使用的帐户尚未达到上限，因为另一台VM使用相同的凭据并可以毫无问题地发送电子邮件。

我尝试将“启动TLS”设置更改为false，而改用端口465，但这也不起作用。

任何帮助都值得赞赏！！预先感谢！

Answer 1

在对配置进行了多次尝试和错误之后，我发现它在配置中需要应用程序属性“ spring.mail.protocol”。

我在application.yml中添加了行protocol: smtp：

spring:
  mail:
    protocol: smtp

解决了读取超时问题，现在可以正确发送电子邮件了。希望以后能对某人有所帮助。

Answer 2

我确实遇到过同样的问题，但是我的情况有所不同

我正尝试使用石英表以日程安排发送邮件

当我不使用Quartz时，一切正常，但是使用石英时，它开始出现故障

上述解决方案对我没有帮助，但是使我了解了我设置的属性。

增加连接超时为我完成了工作

因此更改了应用程序属性

来自：

spring.mail.properties.mail.smtp.timeout=3000

收件人：

spring.mail.properties.mail.smtp.timeout=25000

希望它也适用于其他人

Spring Boot电子邮件发送引发SocketTimeoutException：读取超时

2 个答案: