利用TCP、UDPsocket实现文件传输(带GUI界面)

一、套接字基本概念
套接字(Socket)是对网络中不同主机上的应用进程之间进行双向通信的端点的抽象。一个套接字就是网络上进程通信的一端，提供了应用层进程利用网络协议交换数据的机制。从所处的地位来讲，套接字上联应用进程，下联网络协议栈，是应用程序通过网络协议进行通信的接口，是应用程序与网络协议栈进行交互的接口。
二、套接字通信的基本流程
TCP socket:

UDP socket:


此次实验中，采用将要传输的文件切分成1024字节大小的字节块，进行分块传输。
利用UDP发包时，会有较为严重的丢包现象。原因在于没有流量控制，直接发送导致发送的频率过快，包与包之间的时间间隔太近，接收方来不及接收造成丢包。UDP的sendto函数不会线程阻塞，不像TCP中send函数那样，直到数据发送完才会return回调用函数。
解决方法是在每次发包时调用time.sleep()函数,每次发包时间隔0.05s再发，进行一个简单的流量控制。经过测试，调用sleep函数后发送正常。
三、实验代码
TCP文件传输（需安装python环境及pyqt库）：

import time
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMessageBox, QFileDialog, QMainWindow, QApplication, QInputDialog, QProgressBar
import os
import sys
import socket
import struct
import threading

class EmittingStream(QtCore.QObject):
    textWritten = QtCore.pyqtSignal(str)  # 定义一个发送str的信号
    def write(self, text):
        self.textWritten.emit(str(text))
        QApplication.processEvents()

class Ui_child2(QMainWindow):

    def __init__(self):
        super(Ui_child2,self).__init__()
        self.setupUi(self)
        self.retranslateUi(self)
        sys.stdout = EmittingStream()
        sys.stdout.textWritten.connect(self.outputWritten)

    def outputWritten(self, text):      # 接收信号str的信号槽
        cursor = self.textEdit.textCursor()
        cursor.movePosition(QtGui.QTextCursor.End)
        cursor.insertText(text)
        self.textEdit.setTextCursor(cursor)
        self.textEdit.ensureCursorVisible()

    def setupUi(self, child2):
        child2.setObjectName("child2")
        child2.resize(806, 430)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        child2.setFont(font)
        self.centralwidget = QtWidgets.QWidget(child2)
        self.centralwidget.setObjectName("centralwidget")

        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(190, 330, 171, 61))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        self.pushButton.setFont(font)
        self.pushButton.setObjectName("pushButton")

        self.pushButton1 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton1.setGeometry(QtCore.QRect(400, 330, 171, 61))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        self.pushButton1.setFont(font)
        self.pushButton1.setObjectName("pushButton1")

        self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit.setGeometry(QtCore.QRect(10, 145, 750, 120))
        self.textEdit.setObjectName("textEdit")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.textEdit.setFont(font)
        self.verticalScrollBar1 = QtWidgets.QScrollBar(self.centralwidget)
        self.verticalScrollBar1.setGeometry(QtCore.QRect(760, 145, 25, 120))
        self.verticalScrollBar1.setOrientation(QtCore.Qt.Vertical)
        self.verticalScrollBar1.setObjectName("verticalScrollBar1")

        # 添加“IP地址”标签
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(10, 108, 100, 20))
        self.label.setObjectName("label")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(12)
        self.label.setFont(font)
        # 添加输入IP地址的文本框
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(110, 103, 200, 28))
        self.lineEdit.setObjectName("lineEdit")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.lineEdit.setFont(font)

        # 载入进度条控件
        self.pgb = QProgressBar(self.centralwidget)
        self.pgb.setGeometry(QtCore.QRect(10, 280, 750, 30))
        self.pgb.setObjectName("pgb")
        # 配置一个值表示进度条的当前进度
        self.pv = 0
        self.pgb.setValue(self.pv)

        # 添加“端口”标签
        self.label1 = QtWidgets.QLabel(self.centralwidget)
        self.label1.setGeometry(QtCore.QRect(350, 108, 100, 20))
        self.label1.setObjectName("label1")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(12)
        self.label1.setFont(font)
        # 添加输入端口的文本框
        self.lineEdit1 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit1.setGeometry(QtCore.QRect(425, 103, 200, 28))
        self.lineEdit1.setObjectName("lineEdit1")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.lineEdit1.setFont(font)

        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setGeometry(QtCore.QRect(10, 20, 750, 70))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(10)
        self.listWidget.setFont(font)
        self.listWidget.setObjectName("listWidget")
        self.verticalScrollBar = QtWidgets.QScrollBar(self.centralwidget)
        self.verticalScrollBar.setGeometry(QtCore.QRect(760, 20, 25, 70))
        self.verticalScrollBar.setOrientation(QtCore.Qt.Vertical)
        self.verticalScrollBar.setObjectName("verticalScrollBar")
        child2.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(child2)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 806, 28))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.menubar.setFont(font)
        self.menubar.setObjectName("menubar")
        self.menu = QtWidgets.QMenu(self.menubar)
        self.menu.setObjectName("menu")
        self.menu_2 = QtWidgets.QMenu(self.menubar)
        self.menu_2.setObjectName("menu_2")
        child2.setMenuBar(self.menubar)
        self.action_4 = QtWidgets.QAction(child2)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.action_4.setFont(font)
        self.action_4.setObjectName("action_4")
        self.actionh = QtWidgets.QAction(child2)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.actionh.setFont(font)
        self.actionh.setObjectName("actionh")
        self.actiona = QtWidgets.QAction(child2)
        self.actiona.setObjectName("actiona")
        self.menu.addAction(self.action_4)
        self.menu_2.addAction(self.actionh)
        self.menubar.addAction(self.menu.menuAction())
        self.menubar.addAction(self.menu_2.menuAction())
        self.retranslateUi(child2)
        QtCore.QMetaObject.connectSlotsByName(child2)



        self.lineEdit.returnPressed.connect(self.getip)
        self.lineEdit1.returnPressed.connect(self.getport)
        self.actionh.triggered.connect(self.shuoming)
        self.action_4.triggered.connect(self.searchfile)
        self.pushButton.clicked.connect(self.trans)
        self.pushButton1.clicked.connect(self.server)



    def retranslateUi(self, child2):
        _translate = QtCore.QCoreApplication.translate
        child2.setWindowTitle(_translate("child2", "Tcp文件传输"))
        self.pushButton.setText(_translate("child2", "发  送"))
        self.pushButton1.setText(_translate("child2", "接  收"))
        self.menu.setTitle(_translate("child2", "文件(File)"))
        self.menu_2.setTitle(_translate("child2", "帮助(Help)"))
        self.action_4.setText(_translate("child2", "选择文件"))
        self.actionh.setText(_translate("child2", "操作说明"))
        self.label.setText(_translate("child2", "IP地址："))
        self.label1.setText(_translate("child2", "端口："))

    def getip(self):
        # 弹出可以输入字符串的输入框
        name, ok = QInputDialog.getText(self, "IP地址", "请输入IP地址：", QtWidgets.QLineEdit.Normal)
        if ok:  # 判断是否单击了OK按钮
            self.lineEdit.setText(name)  # 获取输入对话框中的字符串，显示在文本框中

    def getport(self):
        # 弹出可以输入字符串的输入框
        name, ok = QInputDialog.getText(self, "端口", "请输入端口号：", QtWidgets.QLineEdit.Normal)
        if ok:  # 判断是否单击了OK按钮
            self.lineEdit1.setText(name)  # 获取输入对话框中的字符串，显示在文本框中

    def insertlistbox(self, text=''):
        if text != '':
            self.item = QtWidgets.QListWidgetItem(self.listWidget)  # 创建列表项
            self.item.setText(text)  # 设置项文本

    def shuoming(self):
        QtWidgets.QMessageBox.information(self, '操作说明', '操作说明：\n1、打开程序\n2、\
点击文件->选择文件（可多选）\n3、点击发送\n4、要接收对端文件须先点击接收', QMessageBox.Ok)

    def searchfile(self):
        files, filtype = QFileDialog.getOpenFileNames(self, '选择文件', 'C:\\')
        for filename in files:
            self.insertlistbox(filename)

    def client(self, ip, port):
        w = []  # 获取listwidget中条目数
        count = self.listWidget.count()  # 遍历listwidget中的内容
        for i in range(count):
            w.append(self.listWidget.item(i).text())
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.connect((ip, port))  # 服务器连接
            filepath = ''.join(w)  # 文件传输路径

            if os.path.isfile(filepath):  # 判断是否为文件
                # 定义定义文件信息。128s表示文件名为128bytes长，l表示一个int或log文件类型，在此为文件大小
                fileinfo_size = struct.calcsize('128sl')
                # 定义文件头信息，包含文件名和文件大小
                fhead = struct.pack('128sl', os.path.basename(filepath).encode('utf-8'), os.stat(filepath).st_size)
                # 发送文件名称与文件大小
                s.send(fhead)
                total = os.stat(filepath).st_size
                self.pgb.setMinimum(0)
                self.pgb.setMaximum(total)  # 设置进度条的范围
                fp = open(filepath,'rb')
                print('{0}文件发送开始'.format(os.path.basename(filepath)))
                pb = 0

                while True:
                    data = fp.read(1024)
                    if not data:
                        print ('{0}文件发送完毕'.format(os.path.basename(filepath)))
                        break
                    s.send(data)
                    time.sleep(0.03)
                    pb = pb + len(data)
                    self.pgb.setValue(pb)
                s.close()

    def trans(self):
        i = self.lineEdit.text()
        p = int(self.lineEdit1.text())

        self.g = threading.Thread(target=self.client, args=(i, p))
        self.g.setDaemon(True)
        self.g.start()


    def server(self):
        hostname = socket.gethostname()
        ip = socket.gethostbyname(hostname)  # 获取本机IP
        port = 9999
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.bind((ip, port))
        sock.listen(128)
        print("服务器{}正在监听......".format(sock.getsockname()))
        newsock, address = sock.accept()

        self.t = threading.Thread(target=self.deal_data, args=(newsock, address))
        self.t.setDaemon(True)
        self.t.start()

    def deal_data(self, conn, addr):
        while True:
            fileinfo_size = struct.calcsize('128sl')  # 申请相同大小的空间存放发送过来的文件名与文件大小信息
            buf = conn.recv(fileinfo_size)  # 接收文件名与文件大小信息
            if buf:  # 判断是否接收到文件头信息
                filename, filesize = struct.unpack('128sl', buf)  # 获取文件名和文件大小
                fn = filename.strip(b'\00')
                fn = fn.decode()
                print('文件名是{0}, 文件大小是{1}字节'.format(str(fn), filesize))
                recvd_size = 0  # 定义已接收文件的大小
                fp = open('./' + str(fn), 'wb')  # 存储在该脚本所在目录下面
                total = filesize
                self.pgb.setMinimum(0)
                self.pgb.setMaximum(total)  # 设置进度条的范围
                print("文件接收开始")

                while not recvd_size == filesize:  # 将分批次传输的二进制流依次写入到文件
                    if filesize - recvd_size > 1024:
                        data = conn.recv(1024)
                        recvd_size += len(data)
                        self.pgb.setValue(recvd_size)
                    else:
                        data = conn.recv(filesize - recvd_size)
                        recvd_size = filesize
                        self.pgb.setValue(recvd_size)
                    fp.write(data)
                fp.close()
                print('文件接收完成')
            # 传输结束断开连接
            conn.close()
            break

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()  # 创建窗体对象
    ui = Ui_child2()  # 创建PyQt5设计的窗体对象
    ui.setupUi(MainWindow)  # 调用PyQt5窗体的方法对窗体对象进行初始化设置
    MainWindow.show()  # 显示窗体
    sys.exit(app.exec_())  # 程序关闭时退出进程

UDP文件传输（需安装python环境及pyqt库）：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMessageBox, QFileDialog, QMainWindow, QApplication, QInputDialog, QProgressBar
import os
import sys
import socket
import struct
import threading
import time

class EmittingStream(QtCore.QObject):
    textWritten = QtCore.pyqtSignal(str)  # 定义一个发送str的信号
    def write(self, text):
        self.textWritten.emit(str(text))
        QApplication.processEvents()

class Ui_child2(QMainWindow):

    def __init__(self):
        super(Ui_child2, self).__init__()
        self.setupUi(self)
        self.retranslateUi(self)
        sys.stdout = EmittingStream()
        sys.stdout.textWritten.connect(self.outputWritten)

    def outputWritten(self, text):      # 接收信号str的信号槽
        cursor = self.textEdit.textCursor()
        cursor.movePosition(QtGui.QTextCursor.End)
        cursor.insertText(text)
        self.textEdit.setTextCursor(cursor)
        self.textEdit.ensureCursorVisible()

    def setupUi(self, child2):
        child2.setObjectName("child2")
        child2.resize(806, 430)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        child2.setFont(font)
        self.centralwidget = QtWidgets.QWidget(child2)
        self.centralwidget.setObjectName("centralwidget")

        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(190, 330, 171, 61))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        self.pushButton.setFont(font)
        self.pushButton.setObjectName("pushButton")

        self.pushButton1 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton1.setGeometry(QtCore.QRect(400, 330, 171, 61))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(20)
        self.pushButton1.setFont(font)
        self.pushButton1.setObjectName("pushButton1")

        self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit.setGeometry(QtCore.QRect(10, 145, 750, 120))
        self.textEdit.setObjectName("textEdit")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.textEdit.setFont(font)
        self.verticalScrollBar1 = QtWidgets.QScrollBar(self.centralwidget)
        self.verticalScrollBar1.setGeometry(QtCore.QRect(760, 145, 25, 120))
        self.verticalScrollBar1.setOrientation(QtCore.Qt.Vertical)
        self.verticalScrollBar1.setObjectName("verticalScrollBar1")

        # 添加“IP地址”标签
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(10, 108, 100, 20))
        self.label.setObjectName("label")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(12)
        self.label.setFont(font)
        # 添加输入IP地址的文本框
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(110, 103, 200, 28))
        self.lineEdit.setObjectName("lineEdit")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.lineEdit.setFont(font)

        # 添加“端口”标签
        self.label1 = QtWidgets.QLabel(self.centralwidget)
        self.label1.setGeometry(QtCore.QRect(350, 108, 100, 20))
        self.label1.setObjectName("label1")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(12)
        self.label1.setFont(font)
        # 添加输入端口的文本框
        self.lineEdit1 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit1.setGeometry(QtCore.QRect(425, 103, 200, 28))
        self.lineEdit1.setObjectName("lineEdit1")
        font = QtGui.QFont()
        font.setFamily("宋体")
        font.setPointSize(10)
        self.lineEdit1.setFont(font)

        # 载入进度条控件
        self.pgb = QProgressBar(self.centralwidget)
        self.pgb.setGeometry(QtCore.QRect(10, 280, 750, 30))
        self.pgb.setObjectName("pgb")
        # 配置一个值表示进度条的当前进度
        self.pv = 0
        self.pgb.setValue(self.pv)

        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setGeometry(QtCore.QRect(10, 20, 750, 70))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(10)
        self.listWidget.setFont(font)
        self.listWidget.setObjectName("listWidget")
        self.verticalScrollBar = QtWidgets.QScrollBar(self.centralwidget)
        self.verticalScrollBar.setGeometry(QtCore.QRect(760, 20, 25, 70))
        self.verticalScrollBar.setOrientation(QtCore.Qt.Vertical)
        self.verticalScrollBar.setObjectName("verticalScrollBar")
        child2.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(child2)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 806, 28))
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.menubar.setFont(font)
        self.menubar.setObjectName("menubar")
        self.menu = QtWidgets.QMenu(self.menubar)
        self.menu.setObjectName("menu")
        self.menu_2 = QtWidgets.QMenu(self.menubar)
        self.menu_2.setObjectName("menu_2")
        child2.setMenuBar(self.menubar)
        self.action_4 = QtWidgets.QAction(child2)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.action_4.setFont(font)
        self.action_4.setObjectName("action_4")
        self.actionh = QtWidgets.QAction(child2)
        font = QtGui.QFont()
        font.setFamily("黑体")
        font.setPointSize(11)
        self.actionh.setFont(font)
        self.actionh.setObjectName("actionh")
        self.actiona = QtWidgets.QAction(child2)
        self.actiona.setObjectName("actiona")
        self.menu.addAction(self.action_4)
        self.menu_2.addAction(self.actionh)
        self.menubar.addAction(self.menu.menuAction())
        self.menubar.addAction(self.menu_2.menuAction())
        self.retranslateUi(child2)
        QtCore.QMetaObject.connectSlotsByName(child2)


        self.lineEdit.returnPressed.connect(self.getip)
        self.lineEdit1.returnPressed.connect(self.getport)
        self.actionh.triggered.connect(self.shuoming)
        self.action_4.triggered.connect(self.searchfile)
        self.pushButton.clicked.connect(self.trans)
        self.pushButton1.clicked.connect(self.server)

    def retranslateUi(self, child2):
        _translate = QtCore.QCoreApplication.translate
        child2.setWindowTitle(_translate("child2", "Udp文件传输"))
        self.pushButton.setText(_translate("child2", "发  送"))
        self.pushButton1.setText(_translate("child2", "接  收"))
        self.menu.setTitle(_translate("child2", "文件(File)"))
        self.menu_2.setTitle(_translate("child2", "帮助(Help)"))
        self.action_4.setText(_translate("child2", "选择文件"))
        self.actionh.setText(_translate("child2", "操作说明"))
        self.label.setText(_translate("child2", "IP地址："))
        self.label1.setText(_translate("child2", "端口："))

    def getip(self):
        # 弹出可以输入字符串的输入框
        name, ok = QInputDialog.getText(self, "IP地址", "请输入IP地址：", QtWidgets.QLineEdit.Normal)
        if ok:  # 判断是否单击了OK按钮
            self.lineEdit.setText(name)  # 获取输入对话框中的字符串，显示在文本框中

    def getport(self):
        # 弹出可以输入字符串的输入框
        name, ok = QInputDialog.getText(self, "端口", "请输入端口号：", QtWidgets.QLineEdit.Normal)
        if ok:  # 判断是否单击了OK按钮
            self.lineEdit1.setText(name)  # 获取输入对话框中的字符串，显示在文本框中

    def insertlistbox(self, text=''):
        if text != '':
            self.item = QtWidgets.QListWidgetItem(self.listWidget)  # 创建列表项
            self.item.setText(text)  # 设置项文本

    def shuoming(self):
        QtWidgets.QMessageBox.information(self, '操作说明', '操作说明：\n1、打开程序\n2、\
点击文件->选择文件（可多选）\n3、点击发送\n4、要接收对端文件须先点击接收', QMessageBox.Ok)

    def searchfile(self):
        files, filtype = QFileDialog.getOpenFileNames(self, '选择文件', 'C:\\')
        for filename in files:
            self.insertlistbox(filename)

    def client(self, ip, port):
        w = []  # 获取listwidget中条目数
        count = self.listWidget.count()  # 遍历listwidget中的内容
        for i in range(count):
            w.append(self.listWidget.item(i).text())
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            s.connect((ip, port))
            filepath = ''.join(w)  # 文件传输路径

            if os.path.isfile(filepath):  # 判断是否为文件
                # 定义定义文件信息。128s表示文件名为128bytes长，l表示一个int或log文件类型，在此为文件大小
                fileinfo_size = struct.calcsize('128sl')
                # 定义文件头信息，包含文件名和文件大小
                fhead = struct.pack('128sl', os.path.basename(filepath).encode('utf-8'), os.stat(filepath).st_size)
                # 发送文件名称与文件大小
                s.send(fhead)
                total = os.stat(filepath).st_size
                self.pgb.setMinimum(0)
                self.pgb.setMaximum(total)  # 设置进度条的范围
                fp = open(filepath, 'rb')
                print('{0}文件发送开始'.format(os.path.basename(filepath)))
                pb = 0

                while True:
                    data = fp.read(1024)
                    if not data:
                        print('{0}文件发送完毕'.format(os.path.basename(filepath)))
                        break
                    time.sleep(0.05)
                    s.send(data)
                    pb = pb + len(data)
                    self.pgb.setValue(pb)
                s.close()

    def trans(self):
        i = self.lineEdit.text()
        p = int(self.lineEdit1.text())

        self.g = threading.Thread(target=self.client, args=(i, p))
        self.g.setDaemon(True)
        self.g.start()

    def server(self):
        hostname = socket.gethostname()
        ip = socket.gethostbyname(hostname)  # 获取本机IP
        port = 9999
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        sock.bind((ip, port))
        print("服务器{}正在监听......".format(sock.getsockname()))

        self.t = threading.Thread(target=self.deal_data, args=(sock,))
        self.t.setDaemon(True)
        self.t.start()

    def deal_data(self, conn):
        while True:
            fileinfo_size = struct.calcsize('128sl')  # 申请相同大小的空间存放发送过来的文件名与文件大小信息
            buf, addr = conn.recvfrom(fileinfo_size)  # 接收文件名与文件大小信息
            if buf:  # 判断是否接收到文件头信息
                filename, filesize = struct.unpack('128sl', buf)  # 获取文件名和文件大小
                fn = filename.strip(b'\00')
                fn = fn.decode()
                print('文件名是{0}, 文件大小是{1}字节'.format(str(fn), filesize))
                recvd_size = 0  # 定义已接收文件的大小
                fp = open('./' + str(fn), 'wb')  # 存储在该脚本所在目录下面
                total = filesize
                self.pgb.setMinimum(0)
                self.pgb.setMaximum(total)  # 设置进度条的范围
                print("文件接收开始")
                while not recvd_size == filesize:  # 将分批次传输的二进制流依次写入到文件
                    if filesize - recvd_size > 1024:
                        data, addr = conn.recvfrom(1024)
                        recvd_size += len(data)
                        self.pgb.setValue(recvd_size)
                    else:
                        data, addr = conn.recvfrom(filesize - recvd_size)
                        recvd_size = filesize
                        self.pgb.setValue(recvd_size)
                    fp.write(data)
                fp.close()
                print('文件接收完成')
            # 传输结束断开连接
            conn.close()
            break

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()  # 创建窗体对象
    ui = Ui_child2()  # 创建PyQt5设计的窗体对象
    ui.setupUi(MainWindow)  # 调用PyQt5窗体的方法对窗体对象进行初始化设置
    MainWindow.show()  # 显示窗体
    sys.exit(app.exec_())  # 程序关闭时退出进程

四、实验结果截图
实验验证中，构建了了一个Vmware虚拟机，实现物理机与虚拟机之间的文件传输。虚拟机的IP地址为192.168.0.5，物理机IP为192.168.0.1。经测试，实验成功。实验结果截图如下所示：
TCP文件传输：

UDP文件传输：