一、需求描述
能根据关键字和时间段下载指定的邮箱文件：word,pdf,xls.xlxs,zip,rar
二、系统设置

1、邮箱需要开启POP3服务
举例网易邮箱：
（1）进入到网易邮箱官网，“登录”进入邮箱。
（2）点击状态栏上方的“设置”，在弹出来的下拉窗口中，点击“POP3/SMTP/IMAP”

（3）勾选“开启pop3服务”，然后点击蓝色字体，进入开通客户端授权密码。

(4)进入授权码页面，在受权码页面，勾选“开启”

(5)点击“免费获取手机验证码”，输入手机上收到的验证码，然后点击“确定”后，就开通了POP服务。

三、界面代码

# -*- coding: utf-8 -*-# Form implementation generated from reading ui file 'download.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.from PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_Form(object):def setupUi(self, Form):Form.setObjectName("Form")Form.resize(600, 600)sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)sizePolicy.setHorizontalStretch(0)sizePolicy.setVerticalStretch(0)sizePolicy.setHeightForWidth(Form.sizePolicy().hasHeightForWidth())Form.setSizePolicy(sizePolicy)Form.setMouseTracking(True)icon = QtGui.QIcon()icon.addPixmap(QtGui.QPixmap(":/re/icon.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.On)Form.setWindowIcon(icon)Form.setAutoFillBackground(False)Form.setStyleSheet("background-image: url(:/back/2.jpeg);")self.pushButton_2 = QtWidgets.QPushButton(Form)self.pushButton_2.setGeometry(QtCore.QRect(347, 430, 161, 41))self.pushButton_2.setMouseTracking(False)self.pushButton_2.setFocusPolicy(QtCore.Qt.WheelFocus)self.pushButton_2.setLayoutDirection(QtCore.Qt.LeftToRight)self.pushButton_2.setAutoFillBackground(False)self.pushButton_2.setStyleSheet("font: 14pt \"黑体\";\n"
"color: rgb(85, 0, 0);\n"
"background-image: url(:/text/1.jpeg);")icon1 = QtGui.QIcon()icon1.addPixmap(QtGui.QPixmap(":/unzip/解压文件.png"), QtGui.QIcon.Normal, QtGui.QIcon.On)self.pushButton_2.setIcon(icon1)self.pushButton_2.setIconSize(QtCore.QSize(30, 30))self.pushButton_2.setCheckable(False)self.pushButton_2.setAutoRepeatDelay(300)self.pushButton_2.setObjectName("pushButton_2")self.lineEdit_5 = QtWidgets.QLineEdit(Form)self.lineEdit_5.setGeometry(QtCore.QRect(360, 361, 171, 24))self.lineEdit_5.setText("")self.lineEdit_5.setObjectName("lineEdit_5")self.lineEdit_6 = QtWidgets.QLineEdit(Form)self.lineEdit_6.setGeometry(QtCore.QRect(130, 361, 171, 24))self.lineEdit_6.setText("")self.lineEdit_6.setObjectName("lineEdit_6")self.label_5 = QtWidgets.QLabel(Form)self.label_5.setGeometry(QtCore.QRect(308, 361, 45, 24))self.label_5.setStyleSheet("font: 10pt \"黑体\";\n"
"color: rgb(85, 0, 0);")self.label_5.setObjectName("label_5")self.label_6 = QtWidgets.QLabel(Form)self.label_6.setGeometry(QtCore.QRect(78, 361, 45, 24))self.label_6.setStyleSheet("font: 10pt \"黑体\";\n"
"color: rgb(85, 0, 0);")self.label_6.setObjectName("label_6")self.label_4 = QtWidgets.QLabel(Form)self.label_4.setGeometry(QtCore.QRect(303, 302, 75, 24))self.label_4.setStyleSheet("font: 10pt \"黑体\";\n"
"color: rgb(85, 0, 0);")self.label_4.setObjectName("label_4")self.lineEdit_8 = QtWidgets.QLineEdit(Form)self.lineEdit_8.setGeometry(QtCore.QRect(98, 302, 198, 24))self.lineEdit_8.setText("")self.lineEdit_8.setObjectName("lineEdit_8")self.label = QtWidgets.QLabel(Form)self.label.setGeometry(QtCore.QRect(70, 230, 41, 51))self.label.setLayoutDirection(QtCore.Qt.LeftToRight)self.label.setStyleSheet("border-image: url(:/email/邮箱 (1).png);")self.label.setText("")self.label.setObjectName("label")self.lineEdit_4 = QtWidgets.QLineEdit(Form)self.lineEdit_4.setGeometry(QtCore.QRect(385, 302, 198, 24))self.lineEdit_4.setText("")self.lineEdit_4.setObjectName("lineEdit_4")self.lineEdit = QtWidgets.QLineEdit(Form)self.lineEdit.setGeometry(QtCore.QRect(130, 241, 171, 24))self.lineEdit.setLayoutDirection(QtCore.Qt.LeftToRight)self.lineEdit.setStyleSheet("color: rgb(85, 0, 0);\n"
"border-color: rgb(85, 0, 0);")self.lineEdit.setCursorMoveStyle(QtCore.Qt.LogicalMoveStyle)self.lineEdit.setObjectName("lineEdit")self.lineEdit_2 = QtWidgets.QLineEdit(Form)self.lineEdit_2.setGeometry(QtCore.QRect(360, 241, 171, 24))self.lineEdit_2.setLayoutDirection(QtCore.Qt.LeftToRight)self.lineEdit_2.setStyleSheet("")self.lineEdit_2.setText("")self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Password)self.lineEdit_2.setObjectName("lineEdit_2")self.label_2 = QtWidgets.QLabel(Form)self.label_2.setGeometry(QtCore.QRect(312, 230, 41, 41))self.label_2.setLayoutDirection(QtCore.Qt.LeftToRight)self.label_2.setStyleSheet("border-image: url(:/pwd/密码.png);")self.label_2.setText("")self.label_2.setObjectName("label_2")self.label_7 = QtWidgets.QLabel(Form)self.label_7.setGeometry(QtCore.QRect(16, 302, 75, 24))self.label_7.setStyleSheet("font: 10pt \"黑体\";\n"
"color: rgb(85, 0, 0);")self.label_7.setObjectName("label_7")self.label_3 = QtWidgets.QLabel(Form)self.label_3.setGeometry(QtCore.QRect(140, 90, 331, 61))sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)sizePolicy.setHorizontalStretch(0)sizePolicy.setVerticalStretch(0)sizePolicy.setHeightForWidth(self.label_3.sizePolicy().hasHeightForWidth())self.label_3.setSizePolicy(sizePolicy)self.label_3.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)self.label_3.setStyleSheet("background-image: url(:/text/1.jpeg);")self.label_3.setTextFormat(QtCore.Qt.AutoText)self.label_3.setObjectName("label_3")self.pushButton = QtWidgets.QPushButton(Form)self.pushButton.setGeometry(QtCore.QRect(119, 432, 161, 41))self.pushButton.setMouseTracking(False)self.pushButton.setFocusPolicy(QtCore.Qt.WheelFocus)self.pushButton.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)self.pushButton.setLayoutDirection(QtCore.Qt.LeftToRight)self.pushButton.setAutoFillBackground(False)self.pushButton.setStyleSheet("color: rgb(85, 0, 0);\n"
"font: 14pt \"黑体\";\n"
"background-image: url(:/text/1.jpeg);")icon2 = QtGui.QIcon()icon2.addPixmap(QtGui.QPixmap(":/down/IST_18279_33769.png"), QtGui.QIcon.Normal, QtGui.QIcon.On)self.pushButton.setIcon(icon2)self.pushButton.setIconSize(QtCore.QSize(65, 65))self.pushButton.setCheckable(False)self.pushButton.setAutoRepeatDelay(300)self.pushButton.setObjectName("pushButton")self.toolButton = QtWidgets.QToolButton(Form)self.toolButton.setGeometry(QtCore.QRect(0, 0, 71, 21))self.toolButton.setContextMenuPolicy(QtCore.Qt.DefaultContextMenu)self.toolButton.setLayoutDirection(QtCore.Qt.LeftToRight)self.toolButton.setStyleSheet("background-image: url(:/text/1.jpeg);")self.toolButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextOnly)self.toolButton.setObjectName("toolButton")self.toolButton_2 = QtWidgets.QToolButton(Form)self.toolButton_2.setGeometry(QtCore.QRect(70, 0, 71, 21))self.toolButton_2.setStyleSheet("background-image: url(:/text/1.jpeg);")self.toolButton_2.setObjectName("toolButton_2")self.toolButton_3 = QtWidgets.QToolButton(Form)self.toolButton_3.setGeometry(QtCore.QRect(140, 0, 71, 21))self.toolButton_3.setStyleSheet("background-image: url(:/text/1.jpeg);")self.toolButton_3.setObjectName("toolButton_3")self.retranslateUi(Form)QtCore.QMetaObject.connectSlotsByName(Form)def retranslateUi(self, Form):_translate = QtCore.QCoreApplication.translateForm.setWindowTitle(_translate("Form", "文件下载系统"))self.pushButton_2.setText(_translate("Form", "  解压"))self.label_5.setText(_translate("Form", "条件"))self.label_6.setText(_translate("Form", "协议"))self.label_4.setText(_translate("Form", "结束时间"))self.label_7.setText(_translate("Form", "开始时间"))self.label_3.setText(_translate("Form", "<html><head/><body><p align=\"center\"><span style=\" font-size:14pt; font-weight:600; color:#550000;\">欢迎进入邮箱下载界面</span></p></body></html>"))self.pushButton.setText(_translate("Form", "下载"))self.toolButton.setText(_translate("Form", "系统介绍"))self.toolButton_2.setText(_translate("Form", "注意事项"))self.toolButton_3.setText(_translate("Form", "ftp下载"))
import back_rc
import download_rc
import email_rc
import pwd_rc
import re_rc
import text_rc
import unzip_rc

四、下载的功能性代码
import re

from PyQt5 import QtWidgets as qw
import email
import os
import poplib
import time
from email.header import decode_header
from email.parser import Parser

dic = {}
with open(‘user.txt’) as f:
for line in f:
key, value = line.strip().split(’:’)
dic[key] = value

class DownLoadfunctions():
def init(self, ui, MainWindow):
self.ui = ui
self.MainWindow = MainWindow

def decode_str(s):"""字符编码转换"""value, charset = decode_header(s)[0]if charset:value = value.decode(charset)return valuedef file_download(self):host = self.ui.lineEdit_6.text()username = self.ui.lineEdit.text()password = self.ui.lineEdit_2.text()start_date = self.ui.lineEdit_8.text()end_date = self.ui.lineEdit_4.text()keyword = self.ui.lineEdit_5.text()ex_email = re.compile(r'^[\w][a-zA-Z1-9.]{4,19}@[a-zA-Z0-9]{2,3}.[com|gov|net]')result = ex_email.match(username)if len(host) == 0:qw.QMessageBox.information(self.MainWindow, '消息',"没有指定协议！")elif host[-7:]!=username[-7:]:qw.QMessageBox.information(self.MainWindow, '消息',"邮箱协议有误，请检查！")elif len(username) == 0:qw.QMessageBox.information(self.MainWindow, '消息',"未输入邮箱账号！")elif not result:qw.QMessageBox.information(self.MainWindow, '消息',"邮箱格式有误！")elif len(password) == 0:qw.QMessageBox.information(self.MainWindow, '消息',"请输入密码！")elif len(start_date) != 8 or len(end_date) != 8:qw.QMessageBox.information(self.MainWindow, '消息',"请输入正确的开始与结束时间：八位数字！")elif len(keyword) == 0:qw.QMessageBox.information(self.MainWindow, '消息',"下载条件不能为空！")elif dic[username]!=password:qw.QMessageBox.information(self.MainWindow, '消息',"用户名或密码错误")else:print("开始下载......")server = poplib.POP3(host)  # 建立链接# 成功开启POP3/SMTP服务  密码：ERJNGAPQHOPIMRMB# 设置储存路径mail_att_dir = '.'mail_pdf_dir = os.path.join(mail_att_dir, end_date + 'pdf_file')mail_word_dir = os.path.join(mail_att_dir, end_date + 'word_file')mail_zip_dir = os.path.join(mail_att_dir, end_date + 'zip_file')mail_rar_dir = os.path.join(mail_att_dir, end_date + 'rar_file')mail_xls_dir = os.path.join(mail_att_dir, end_date + 'xls_file')# 登录server.user(username)server.pass_(password)resp, mails, octets = server.list()  # 获取所有邮件编号，mails的格式为['mesg_num octets', ...]# 倒序遍历邮件index = len(mails)# print(index)for i in range(index, 0, -1):# lines存储了邮件的原始文本的每一行resp, lines, octets = server.retr(i)# 邮件的原始文本:msg_content = b'\r\n'.join(lines).decode('utf-8')# 解析邮件:msg = Parser().parsestr(msg_content)try:# 获取邮件日期date = time.strptime(msg.get('Date')[:24], '%a, %d %b %Y %H:%M:%S')date = time.strftime('%Y%m%d', date)if date < start_date:breakelif date > end_date:continue# 下载附件else:print('正在读取 ' + DownLoadfunctions.decode_str(msg.get('Subject')))attachment_files = []for part in msg.walk():file_name = part.get_filename()  # 获取附件名称类型contType = part.get_content_type()if file_name:h = email.header.Header(file_name)dh = email.header.decode_header(h)  # 对附件名称进行解码filename = dh[0][0]if dh[0][1]:filename = DownLoadfunctions.decode_str(str(filename, dh[0][1]))  # 将附件名称可读化data = part.get_payload(decode=True)  # 下载附件# 创建附件存储文件夹if keyword in filename:if os.path.splitext(filename)[-1] == '.docx' or os.path.splitext(filename)[-1] == '.doc':if not os.path.isdir(mail_word_dir):os.mkdir(mail_word_dir)# 在指定目录下创建文件，注意二进制文件需要用wb模式打开att_file = open(mail_word_dir + os.sep + filename, 'wb')attachment_files.append(filename)att_file.write(data)  # 保存附件att_file.close()elif os.path.splitext(filename)[-1] == '.pdf':if not os.path.isdir(mail_pdf_dir):os.mkdir(mail_pdf_dir)# 在指定目录下创建文件，注意二进制文件需要用wb模式打开att_file = open(mail_pdf_dir + os.sep + filename, 'wb')attachment_files.append(filename)att_file.write(data)  # 保存附件att_file.close()elif os.path.splitext(filename)[-1] == '.xls' or os.path.splitext(filename)[-1] == '.xlsx' \or os.path.splitext(filename)[-1] == '.xlsm':if not os.path.isdir(mail_xls_dir):os.mkdir(mail_xls_dir)# 在指定目录下创建文件，注意二进制文件需要用wb模式打开att_file = open(mail_xls_dir + os.sep + filename, 'wb')attachment_files.append(filename)att_file.write(data)  # 保存附件att_file.close()elif os.path.splitext(filename)[-1] == '.zip':if not os.path.isdir(mail_zip_dir):os.mkdir(mail_zip_dir)# 在指定目录下创建文件，注意二进制文件需要用wb模式打开att_file = open(mail_zip_dir + os.sep + filename, 'wb')attachment_files.append(filename)att_file.write(data)  # 保存附件att_file.close()elif os.path.splitext(filename)[-1] == '.rar':if not os.path.isdir(mail_rar_dir):os.mkdir(mail_rar_dir)# 在指定目录下创建文件，注意二进制文件需要用wb模式打开att_file = open(mail_rar_dir + os.sep + filename, 'wb')attachment_files.append(filename)att_file.write(data)  # 保存附件att_file.close()except:continueserver.quit()print('嘿！！  下载好了呦！！<(￣︶￣)↗[GO!]')

五、主程序入口设计见下一篇文章