弹簧集成 - 文件夹关闭异常

Question

我正在尝试过滤传入的邮件 - 例如，如果邮件正文包含"github.com"，则应用程序不会自动回复。所以我尝试为此编写一个集成流(请参阅下面的代码(。我不确定如何处理它，因为变压器似乎无法打开收件箱文件夹，这似乎是 Java 邮件 API 问题？

@Bean
open fun flow(): IntegrationFlow
{
    return IntegrationFlows
        .from("emailReceiveChannel")
        .transform(transformer())
        .filter("@messageFilter.containsDomainNames('payload')")
        .handle(MessageHandler(MailServiceImpl(javaMailSender(), mailStore())))
        .get()
}

其中transfomer()是：

@Bean
@Transformer(inputChannel = "emailReceiveChannel", outputChannel = "outputChannel")
open fun transformer(): org.springframework.integration.transformer.Transformer
{
    return MailToStringTransformer()
}

和messageFilter：

@Component
class MessageFilter
{
    @Filter
    open fun containsDomainNames(messageBody: String): Boolean
    {
        return messageBody.contains("github.com") ||
               messageBody.contains("trello.com") ||
               messageBody.contains("bitbucket.com")
    }
}

.

@Bean
@InboundChannelAdapter(autoStartup = "true", value = "emailReceiveChannel", poller = (arrayOf(Poller(fixedDelay = "10000", maxMessagesPerPoll = "10"))))
open fun mailReceivingMessageSource(mailReceiver: ImapMailReceiver): MailReceivingMessageSource
{
    return MailReceivingMessageSource(mailReceiver)
}
@Bean
open fun pollingConsumer(): PollingConsumer
{
    return PollingConsumer(emailReceiveChannel(), MessageHandler(MailServiceImpl(javaMailSender(), mailStore())))
}
@Bean
open fun outputChannel(): PollableChannel
{
    return QueueChannel()
}
@Bean
open fun emailReceiveChannel(): PollableChannel
{
    return QueueChannel(10)
}

堆栈跟踪：

2018-01-20 13:05:53.840 ERROR 8204 --- [ask-scheduler-6] o.s.integration.handler.LoggingHandler   : org.springframework.integration.transformer.MessageTransformationException: failed to transform mail message; nested exception is javax.mail.FolderClosedException, failedMessage=GenericMessage [payload=org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage@3f0ef4a2, headers={id=e9eff05d-e9af-70e4-73f7-c4d39c740291, timestamp=1516449953838}]
at org.springframework.integration.mail.transformer.AbstractMailMessageTransformer.transform(AbstractMailMessageTransformer.java:83)
at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage(MessageTransformingHandler.java:89)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:131)
at org.springframework.integration.endpoint.PollingConsumer.handleMessage(PollingConsumer.java:129)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:271)
at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.lambda$run$0(AbstractPollingEndpoint.java:372)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$execute$0(ErrorHandlingTaskExecutor.java:53)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:51)
at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:366)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:83)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Caused by: javax.mail.FolderClosedException
    at com.sun.mail.imap.IMAPMessage.getProtocol(IMAPMessage.java:153)
    at com.sun.mail.imap.IMAPBodyPart.loadHeaders(IMAPBodyPart.java:390)
    at com.sun.mail.imap.IMAPBodyPart.getNonMatchingHeaderLines(IMAPBodyPart.java:371)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1536)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:948)
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:538)
    at org.springframework.integration.mail.transformer.MailToStringTransformer.doTransform(MailToStringTransformer.java:62)
    at org.springframework.integration.mail.transformer.AbstractMailMessageTransformer.transform(AbstractMailMessageTransformer.java:80)
    ... 19 more

Answer 1

此问题与集成库更新相对应，这就是为什么降级此库很有帮助的原因，但正确的方法是再添加一个java mail属性：simpleContent。

请阅读文档： https://docs.spring.io/spring-integration/api/org/springframework/integration/mail/AbstractMailReceiver.html#setSimpleContent-boolean-

还有我的代码片段：

@Bean
public IntegrationFlow userEmailFlow(EmailProperties props,
                                     EmailToUserTransformer emailToUserTransformer,
                                     UserMessageHandler userMessageHandler) {
    return IntegrationFlows
            .from(Mail.imapInboundAdapter(props.getImapUrl())
                          .javaMailProperties(p -> p.put("mail.debug", "false")
                                  .put("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory")
                                  .put("mail.imap.socketFactory.fallback", "false")
                                  .put("mail.store.protocol", "imaps"))
                          .shouldMarkMessagesAsRead(false)
                          .shouldDeleteMessages(false)
                          .simpleContent(true),
                  e -> e.poller(Pollers.fixedDelay(props.getPollRate())))
            .transform(emailToUserTransformer)
            .handle(userMessageHandler)
            .get();
}

Answer 2

我在邮件附件项目中遇到了同样的问题：https://github.com/spring-projects/spring-integration

我用

<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-bom</artifactId>
    <version>4.3.19.RELEASE</version>
    <scope>import</scope>
    <type>pom</type>
</dependency>

而不是

<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-bom</artifactId>
    <version>5.1.3.RELEASE</version>
    <scope>import</scope>
    <type>pom</type>
</dependency>

编辑：版本5.1.3.RELEASE也可以，但这是必要的：simple-content="true" in mail：inbound-channel-adapter