使用 PyQt5 设计下载远程服务器日志文件程序的思路

DownloadServerLog
├── app
│   ├── downloadlog.py
│   └── downloadlog_qtui.py
├── main.py
└── ui
│   └── downloadlog_qtui.ui
├── .env

import sys

from PyQt5 import QtCore
from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtWidgets import QApplication, QMainWindow
from threading import Thread

from app.downloadlog_qtui import Ui_Dialog
from app.downloadlog import DownloadLog


class CommunicateSignal(QObject):
    text_print = pyqtSignal(str)


# MyWindow 是主窗口程序，继承自 PyQt5.QtWidgets.QMainWindow
# 和通过 ui 文件生成的 downloadlog_qtui.py 中的 Ui_Dialog 类
class MyWindow(QMainWindow, Ui_Dialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)
        self.btn_download.clicked.connect(self.click_download)

        # 自定义信号处理函数
        self.comm_signal = CommunicateSignal()
        self.comm_signal.text_print.connect(self.show_text)

        self.set_window_init_data()

    def set_window_init_data(self):
        """设置程序窗体初始值"""
        # 从 .env 读取环境变量
        result_dict = dict()
        with open('.env', 'r', encoding='utf-8') as f:
            for line in f.readlines():
                key = line.split('=')[0].strip()
                value = line.split('=')[-1].strip()
                result_dict[key] = value

        # 设置输入框值
        _translate = QtCore.QCoreApplication.translate
        self.host.setText(_translate("Dialog", result_dict.get("HOST", '')))
        self.port.setText(_translate("Dialog", result_dict.get("PORT", '22')))
        self.username.setText(_translate("Dialog", result_dict.get("USERNAME", 'root')))
        self.passWord.setText(_translate("Dialog", result_dict.get("PASSWORD", '')))
        self.directory.setPlainText(_translate("Dialog", result_dict.get("DIRECTORY", '')))
        self.startTime.setDate(QtCore.QDate.currentDate())
        self.endTime.setDate(QtCore.QDate.currentDate())


    def get_window_input_value(self):
        """获取程序各「输入框」组件值"""
        return {
            "host": self.host.text(),
            "port": self.port.text(),
            "username": self.username.text(),
            "password": self.password.text(),
            "directory": self.directory.toPlainText(),
            "start_time": self.startTime.date().toString("yyyy-MM-dd"),
            "end_time": self.endTime.date().toString("yyyy-MM-dd"),
            "suffix": ".log",
        }

    def show_text(self, text):
        """将文本内容追加到程序「展示框」"""
        self.textBrowser.append(text)

    def click_download(self):
        """处理点击「下载」按钮事件"""
        params = self.get_window_input_value()

        def run():
            res = DownloadLog(conn_type='ssh', comm_signal=self.comm_signal, **params)
            res.main()

        t = Thread(target=run)
        t.start()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    myWin = MyWindow()
    myWin.show()
    sys.exit(app.exec_())

class DownloadLog(object):
    def __init__(self, **kwargs):
        """初始化一些参数"""
        ...

    def main(self):
        # 获取 Transport 实例
        tran = paramiko.Transport((self.host, int(self.port)))
        # 连接 SSH 服务端
        tran.connect(username=self.username, password=self.password)
        # 创建 SFTP 实例
        self.sftp = paramiko.SFTPClient.from_transport(tran)
        # 下载文件
        # :param str remotepath: the remote file to copy
        # :param str localpath: the destination path on the local host
        self.sftp.get(remotepath=self.remote_path, localpath=self.local_path)

class CommunicateSignal(QObject):
    text_print = pyqtSignal(str)

# 自定义信号处理函数
self.comm_signal = CommunicateSignal()
self.comm_signal.text_print.connect(self.show_text)

# 通过该信号对象的 emit 方法发出信号，emit 方法的参数传递必要的数据。
# 参数类型遵循定义 Signal 时指定的类型。
self.comm_signal.text_print.emit(text)

def show_text(self, text):
    """将文本内容追加到程序「展示框」"""
    self.textBrowser.append(text)