如何使用JavaMail API读取电子邮件附件（当contentType为text/plain时）

我们有一个外部应用程序，它向我们发送一封带有附件的电子邮件。 对于contentType Multipart：我们能够解析和处理附件

但有时他们发送的邮件带有contentType text/plain（message.getContent（）为null），我们无法从message obj获取附件和电子邮件正文

发送方无法将内容类型固定为多部分，我们必须在接收方端容纳它

我们使用的是JavaMail API 1.5，尝试了ApacheCommons mail util，但它仅在message.getContent（）中有对象时才起作用

文件夹emailFolder=store.getFolder（“收件箱”）； emailFolder.open（文件夹只读）

Message[]messages=emailFolder.getMessages（）； System.out.println（“总消息”+消息长度）

for（int i=0；i

Multipart multipart = (Multipart) message.getContent();
 for(int k = 0; k < multipart.getCount(); k++){
   BodyPart bodyPart = multipart.getBodyPart(k);  
   InputStream stream = 
                     (InputStream) bodyPart.getInputStream();  
 }

Multipart Multipart=（Multipart）message.getContent（）；
for（int k=0；k

}

**原始MIME消息内容：**
发件人：发件人
致：“'support@XYZ.com'" 
主题：变更请求#CHG85 02附件
线程主题：更改请求#CHG85 02附件
线程索引：AdVQ+bdv3Fd+yaP6Qr2RCdQvPsvI9Q==
日期：2019年8月12日星期一10:37:23+0000
消息ID:
接受语言：en US
内容语言：en US
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--_002_1DCP97A916B4F929414D0D4B6703397DELHIXCHMBX003MYORG有限公司_
内容类型：文本/纯文本；charset=“us ascii”
内容传输编码：引用可打印
嗨，用户，
我们已收到数据，将处理并通知您。
非常感谢。
管理
--_002_1DCP97A916B4F929414D0D4B6703397DELHIXCHMBX003MYORG有限公司_
内容类型：应用程序/八位字节流；name=“testData.csv”
内容描述：testData.csv
内容处置：附件；filename=“testData.csv”；尺寸=393；
创建日期=“2019年8月12日星期一10:35:38 GMT”；
修改日期=“2019年8月12日星期一10:35:38 GMT”
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如果内容类型为文本/普通，则没有附件

---

如果message.getContent（）返回null，则可能也没有消息内容，或者消息的格式有问题。发布消息的原始MIME内容，我可以帮助您找出消息的错误。

我已更新消息的原始MIME内容，我可以在原始内容中看到消息正文和附件（base64字符串）。getContentType（）返回text/plain&getContent（）为null。现在如何获取正文和附件？该消息存在一些问题。收件人地址无效。我将忽略那个问题。后面有一个空行

**RAW MIME message content :**
  From: SENDER <SENDER@MyOrgLtd.com>
To: "'support@XYZ.com'" <'support@XYZ.com'>
Subject: Change Request #CHG85 02 ATTACHMENT
Thread-Topic: Change Request #CHG85 02 ATTACHMENT
Thread-Index: AdVQ+bdv3Fd+yaP6Qr2RCdQvPsvI9Q==
Date: Mon, 12 Aug 2019 10:37:23 +0000
Message-ID: <1dcdc97a916b4f929414d0d4b6703397@DELHIXCHMBX003.MyOrgLtd.com>
Accept-Language: en-US
Content-Language: en-US
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--_002_1dcdc97a916b4f929414d0d4b6703397DELHIXCHMBX003MyOrgLtd_
Content-Type: text/plain; charset="us-ascii"
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hi User,
    We have received the data, will process and inform you.

Thank you,
admin


--_002_1dcdc97a916b4f929414d0d4b6703397DELHIXCHMBX003MyOrgLtd_
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