由于文件夹可能有多层目录，因此需要对其进行递归遍历。

本文采取了简单的协议定制，定义了五条命令，指令Head如下：
Sync：标识开始同步文件夹
End：标识结束同步
File：标识传输的文件名（相对路径）
Folder：标志文件夹（相对路径）
None：文件内容

每条命令以CMB_BEGIN开始，以CMB_END结束。

客户端需要对接收缓冲做解析，取出一条一条的指令，然后根据指令的Head做相应的处理，比如创建文件夹、写入文件等。

下面是服务端的代码：

from twisted.internet import reactorfrom twisted.internet.protocol import Protocol,Factoryfrom twisted.protocols.basic import LineReceiverimport osimport struct BUFSIZE = 4096 class SimpleLogger(Protocol): def connectionMade(self): print 'Got connection from', self.transport.client def connectionLost(self, reason): print self.transport.client, 'disconnected' def dataReceived(self, line): print line self.transport.write("Hello Client, I am the Server!\r\n") self.transport.write("CMB_BEGIN") self.transport.write("Sync") self.transport.write("CMB_END") self.send_file_folder('server') def send_file_folder(self,folder): '''send folder to the client''' for f in os.listdir(folder): sourceF = os.path.join(folder, f) if os.path.isfile(sourceF): print 'File:',sourceF[7:] self.transport.write("CMB_BEGIN") self.transport.write("File:" + sourceF[7:]) self.transport.write("CMB_END") fp = open(sourceF,'rb') while 1: filedata = fp.read(BUFSIZE) if not filedata: break else: self.transport.write("CMB_BEGIN") self.transport.write(filedata) print 'send size:::::::::',len(filedata) self.transport.write("CMB_END") fp.close() self.transport.write("CMB_BEGIN") self.transport.write("End") self.transport.write("CMB_END") if os.path.isdir(sourceF): print 'Folder:',sourceF[7:] self.transport.write("CMB_BEGIN") self.transport.write("Folder:" + sourceF[7:]) self.transport.write("CMB_END") self.send_file_folder(sourceF) factory = Factory()factory.protocol = SimpleLoggerreactor.listenTCP(1234, factory)reactor.run()

Server在收到Client的某个信号之后(此代码中，当Client随便向Server发送任何内容都可)，Server即会调用send_file_folder将sever文件夹下的内容全部发送给客户端。

服务端运行结果如下：

下面是客户端的代码：

from twisted.internet.selectreactor import SelectReactorfrom twisted.internet.protocol import Protocol,ClientFactoryfrom twisted.protocols.basic import LineReceiverimport osfrom struct import * reactor = SelectReactor()protocol = Protocol()prepare = 0filename = ""sourceDir = 'client'recvBuffer = '' def delete_file_folder(src): '''delete files and folders''' if os.path.isfile(src): try: os.remove(src) except: pass elif os.path.isdir(src): for item in os.listdir(src): itemsrc = os.path.join(src,item) delete_file_folder(itemsrc) try: os.rmdir(src) except: pass def clean_file_folder(src): '''delete files and child folders''' delete_file_folder(src) os.mkdir(src) def writefile(filename,data): print 'write file size:::::::::',len(data) fp = open(filename,'a+b') fp.write(data) fp.close() class QuickDisconnectedProtocol(Protocol): def connectionMade(self): print "Connected to %s."%self.transport.getPeer().host self.transport.write("Hello server, I am the client!\r\n") def dataReceived(self, line): global prepare global filename global sourceDir global recvBuffer recvBuffer = recvBuffer + line self.processRecvBuffer() def processRecvBuffer(self): global prepare global filename global sourceDir global recvBuffer while len(recvBuffer) > 0 : index1 = recvBuffer.find('CMB_BEGIN') index2 = recvBuffer.find('CMB_END') if index1 >= 0 and index2 >= 0: line = recvBuffer[index1+9:index2] recvBuffer = recvBuffer[index2+7:] if line == 'Sync': clean_file_folder(sourceDir) if line[0:3] == "End": prepare = 0 elif line[0:5] == "File:": name = line[5:] filename = os.path.join(sourceDir, name) print 'mk file:',filename prepare = 1 elif line[0:7] == "Folder:": name = line[7:] filename = os.path.join(sourceDir, name) print 'mkdir:',filename os.mkdir(filename) elif prepare == 1: writefile(filename,line) else: break class BasicClientFactory(ClientFactory): protocol=QuickDisconnectedProtocol def clientConnectionLost(self,connector,reason): print 'Lost connection: %s'%reason.getErrorMessage() reactor.stop() def clientConnectionFailed(self,connector,reason): print 'Connection failed: %s'%reason.getErrorMessage() reactor.stop() reactor.connectTCP('localhost',1234,BasicClientFactory())reactor.run()

客户端提取出来自Server的指令，当提取出Sync指令时，则将sourceDir目录清空，然后根据后续的指令，跟Server的文件夹进行同步。

客户端运行结果如下：

需要注意的地方：
Client写入文件时，需要以二进制的方式打开文件，否则，在传输二进制文件时可能出现错误或导致文件损坏。

经过测试，代码可以正常的运行，文件夹同步成功，文本文件、图像和其他类型的二进制文件均可正常传输。