使用Javamail API和IMAP批量获取邮件正文

问题描述

有没有办法通过使用Javamail API一次调用IMAP服务器来获取多封电子邮件的邮件正文？

Is there a way to fetch the mail bodies of multiple emails with a single call to an IMAP server using the Javamail API?

我知道我可以访问使用Message.getContent（）调用给定消息的主体，但最终会为每个消息调用imap服务器。

I know I can get to the body of a given message using the Message.getContent() call, but this ends up doing a call to the imap server for each individual message.

是否可以使用FetchProfile和Folder.fetch调用批量获取主体？该文档暗示FetchProfile仅用于头数据。我尝试了以下方法，但是没有做到这一点：

Is it possible to use the FetchProfile and Folder.fetch call to bulk fetch bodies? The documentation implies that the FetchProfile is only for header data. I tried the following, but that didn't do the trick:

FetchProfile fp = new FetchProfile();
fp.add("rfc822.text");
inbox.fetch(messages, fp);

如果使用Javamail无法做到这一点，是否是由于Javamail API中的约束或者IMAP协议是否根本不支持？

If it is not possible to do this using Javamail, is it due to a constraint in the Javamail API or does the IMAP protocol simply not support this?

推荐答案

JavaMail的限制。 IMAP协议允许一次获取多个消息的正文：

Limitation of JavaMail. The IMAP protocol allows fetching the bodies of several messages at once:

a1 fetch 1:* (rfc822.header rfc822.text)

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