使用imaplib获取电子邮件正文和附件

XiaoPaiShen

1.首先定义一个类： Email_Checker
在该类的构造方法中，创建邮件服务器并用邮件地址和密码登录。
选择 'inbox' 表示收件箱
2.在imap 协议下，邮件的正文可以有两种格式保存，'text/plain', 'text/html'
我将这两种格式保存在mail_content字典中，如果'text/plain'存在，就返回该值，否则返回'text/html'的值
3.mail_messages中保存了所有符合过滤条件的邮件

import imaplib
import email

from email.header import decode_header
class Email_Checker:
    def __init__(self, email='', password='', server='imap.gmail.com'):
        self.server = server
        self.email = email
        self.password = password
        self.mail = imaplib.IMAP4_SSL(self.server)
        self.mail.login(self.email, self.password)
        self.mail.select('inbox')
        self.mail_content = {'plain': None, 'html': None}
        self.mail_messages = list()

使用email.header中的decode_header方法进行解码，用于附件文件名可以有正确的显示

def decode_content(self, content):
        if not content:
            return None
        value, charset = decode_header(content)[0]
        if charset:
            value = value.decode(charset)
        return value

在imap 协议下，可以使用uid方法查找和提取邮箱中的message,
Using UIDs instead of volatile sequential ids
The imap search function returns a sequential id, meaning id 5 is the 5th email in your inbox.
That means if a user deletes email 10, all emails above email 10 are now pointing to the wrong email.
This is unacceptable.

Luckily we can ask the imap server to return a UID (unique id) instead.
The way this works is pretty simple: use the uid function, and pass in the string of the command in as the first argument. The rest behaves exactly the same.

Parsing Raw Emails
Emails pretty much look like gibberish. Luckily we have a python library for dealing with emails called… email.
It can convert raw emails into the familiar EmailMessage object.

def filter_mails(self, title):
        status, data = self.mail.uid('search', None, "ALL")
        email_uids = data[0].split()
        for uid in email_uids:
            status, content = self.mail.uid('fetch', uid, '(RFC822)')
            raw_email = content[0][1]
            message = email.message_from_bytes(raw_email)
            mail_subject = message['subject']

            if mail_subject == title:
                self.mail_messages.append(message)

下载附件

def download_attachment(self, message):
        for part in message.walk():
            if part.get_content_maintype() == 'multipart':
                continue
            if part.get('Content-Disposition') is None:
                continue

            filename = part.get_filename()
            filename = self.decode_content(filename)
            print('FileName: ', filename)

            if not filename:
                continue
            
            # save attachment             
            with open(filename, 'wb') as attach:
                data = part.get_payload(decode=True) 
                attach.write(data)  
                print("attachment {0} saved".format(filename))

完整程序：

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xyj1997

很好的，解决了我的问题