Java Email message Parser？

Question

是否有人熟悉Java库，可以帮助解析下面电子邮件的字段（日期，主题，来自，等）？

Message-ID: <19815303.1075861029555.JavaMail.ss@kk>
Date: Wed, 6 Mar 2010 12:32:20 -0800 (PST)
From: someone@someotherplace.com
To: someone@someplace.com
Subject: some subject
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-From: one, some <some.one@someotherplace.com>
X-To: one
X-cc: 
X-bcc: 
X-Folder: Bob\Inbox
X-Origin: Bob-R
X-FileName: rbob (Non-Privileged).pst


some message

Answer 1

JavaMail是一个oracle库，它在javax.mail包中提供邮件服务和邮件相关服务（如解析传统和MIME消息）。此外，Apache还有一个用于邮件处理的Commons Email库。

在JavaMail api中，解析包含电子邮件消息的字符串（可能是明确的MIME，也可能不是明确的MIME）的简单方法如下：

String content = ...
Session s = Session.getInstance(new Properties());
InputStream is = new ByteArrayInputStream(content.getBytes());
MimeMessage message = new MimeMessage(s, is);

并且可以像这样解析标题

message.getAllHeaderLines();
for (Enumeration<Header> e = message.getAllHeaders(); e.hasMoreElements();) {
    Header h = e.nextElement();
    h.getName();
    h.getValue();
}

Answer 2

我遇到过JavaMail问题（它无法解析它应该发送的一些电子邮件）。

我使用Mime4J获得了更好的结果。

Answer 3

我建议您使用email-mime-parser，

以下示例代码为您提供了所需的所有相关信息：

ContentHandler contentHandler = new CustomContentHandler();

MimeConfig mime4jParserConfig = new MimeConfig();
BodyDescriptorBuilder bodyDescriptorBuilder = new DefaultBodyDescriptorBuilder();
MimeStreamParser mime4jParser = new MimeStreamParser(mime4jParserConfig,DecodeMonitor.SILENT,bodyDescriptorBuilder);
mime4jParser.setContentDecoding(true);
mime4jParser.setContentHandler(contentHandler);

InputStream mailIn = 'Provide email mime stream here';
mime4jParser.parse(mailIn);

Email email = ((CustomContentHandler) contentHandler).getEmail();

List<Attachment> attachments =  email.getAttachments();

Attachment calendar = email.getCalendarBody();
Attachment htmlBody = email.getHTMLEmailBody();
Attachment plainText = email.getPlainTextEmailBody();

String to = email.getToEmailHeaderValue();
String cc = email.getCCEmailHeaderValue();
String from = email.getFromEmailHeaderValue();