On the server side, you would extract the MimeMessage from the received DataHanlder object to know details about the transaction.

在服务器端，将从接收到的DataHanlder对象提取MimeMessage，以了解事务的详细信息。

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In this case, the Transformer is given a Message containing a payload of type MimeMessage, which is used to create an object of type BlogPost.

这种情况下，会给Transformer给定一个包含MimeMessage类型有效负载的Message，转化器用于创建BlogPost类型的一个对象。

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