如何通过Spring集成正确获取入站消息头 [英] how to correctly get inbound message headers with spring integration

问题描述

我将在春季收到一封电子邮件，其中包含一个非常基本的脚本

I'm receiving email with spring, with a very basic script so far

ApplicationContext ac = new ClassPathXmlApplicationContext("imap.xml");
DirectChannel inputChannel = ac.getBean("receiveChannel", DirectChannel.class);
inputChannel.subscribe(message -> {
    System.out.println(message.getHeaders());
    System.out.println(message.getPayload());

    MessageHeaders headers = message.getHeaders();
    String from = (String) headers.get("mail_from");
});

根据文档，我认为标头会被自动解析，但是我在第一个System.out.println();中获得的标头只是

According to the documentation I thought the headers would get parsed automatically, but the headers I get with the first System.out.println(); are just

{id=c65f55aa-c611-71ee-c56d-6bf13c6f71d0, timestamp=1468869891279}

第二个输出(对于getPayload())是

org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage@6af5615d

from输出null ...

然后我尝试使用MailToStringTransformer

MailToStringTransformer a = transformer();
    a.setCharset("utf-8");
System.out.println(a.transform(message));

哪个输出有效负载和我期望的所有标头，但是(自然地)输出为String.

Which outputs the payload and all the headers I have expected, but (naturally) as a String.

我该怎么做才能在对象中获取消息标题和文本?

What do I have to do to get the messages headers and text in an object?

推荐答案

不确定您要引用的文档是什么，但是当前的4.3版本具有以下内容:

Not sure which documentation are you referring, but the current 4.3 version has this:

默认情况下，入站适配器生成的消息的有效负载是原始的MimeMessage；您可以使用该对象询问标题和内容.从版本4.3开始，您可以提供一个HeaderMapper<MimeMessage>来将标头映射到MessageHeaders.为了方便起见，为此提供了DefaultMailHeaderMapper.

By default, the payload of messages produced by the inbound adapters is the raw MimeMessage; you can interrogate the headers and content using that object. Starting with version 4.3, you can provide a HeaderMapper<MimeMessage> to map the headers to MessageHeaders; for convenience, a DefaultMailHeaderMapper is provided for this purpose.

还有一点:

当不提供标题映射器时，消息有效负载是javax.mail呈现的MimeMessage.该框架提供了MailToStringTransformer ...

如果需要对映射进行一些自定义，则始终可以提供自己的HeaderMapper<MimeMessage>实现或DefaultMailHeaderMapper扩展名.

If you need some customization on the mapping you always can provide your own HeaderMapper<MimeMessage> implementation or DefaultMailHeaderMapper extension.

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