基于tcp網(wǎng)絡(luò)加密解密

1、基于基于TCP的網(wǎng)絡(luò)加密解密的網(wǎng)絡(luò)加密解密加密解密方法：替換法服務(wù)器：服務(wù)器：程序：程序：packagehynimptjava.io.BufferedReaderimptjava.io.DataOutputStreamimptjava.io.InputStreamReaderimpt.ServerSocketimpt.SocketpublicclassTCPServerpublicstaticvoidmain(Stringargv[])

2、throwsExceptionStringclientSentenceStringcapitalizedSentenceStringaServerSocketwelcomeSocket=newServerSocket(4017)while(true)SocketconnectionSocket=welcomeSocket.accept()BufferedReaderinFromClient=newBufferedReader(newIn

3、putStreamReader(connectionSocket.getInputStream()))DataOutputStreamoutToClient=newDataOutputStream(connectionSocket.getOutputStream())clientSentence=inFromClient.readLine()capitalizedSentence=clientSentence.toUpperCase()

4、na=capitalizedSentence.substring(01)提取首位字符if(a.matches(“[AZ]“))加密服務(wù)：C發(fā)送一串明文給S，S返回一串密文。解密服務(wù)：C發(fā)送一串密文給S，S返回一串明文。capitalizedSentence=capitalizedSentence.replace(“$““n“)capitalizedSentence=capitalizedSentence.replace(“%““o“)c

5、apitalizedSentence=capitalizedSentence.replace(“^““p“)capitalizedSentence=capitalizedSentence.replace(“capitalizedSentence=capitalizedSentence.replace(“““r“)capitalizedSentence=capitalizedSentence.replace(“(““s“)capitali

6、zedSentence=capitalizedSentence.replace(“)““t“)capitalizedSentence=capitalizedSentence.replace(“““u“)capitalizedSentence=capitalizedSentence.replace(“““v“)capitalizedSentence=capitalizedSentence.replace(“““w“)capitalized