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1、基于TCP的网络加密解密加密服务：C发送一串明文给S，S返回一串密文。解密服务：C发送一串密文给S，S返回一串明文。加密解密方法：替换法服务器：程序：packagehyn;importjava.io.BufferedReader;importjava.io.DataOutputStream;importjava.io.InputStreamReader;importjava.net.ServerSocket;importjava.net.Socket;publicclassTCPServer{publicstaticvoidmain(Strin
2、gargv[])throwsException{StringclientSentence;StringcapitalizedSentence;Stringa;ServerSocketwelcomeSocket=newServerSocket(4017);while(true){SocketconnectionSocket=welcomeSocket.accept();BufferedReaderinFromClient=newBufferedReader(newInputStreamReader(connectionSocket.getInpu
3、tStream()));DataOutputStreamoutToClient=newDataOutputStream(connectionSocket.getOutputStream());clientSentence=inFromClient.readLine();capitalizedSentence=clientSentence.toUpperCase()+'';a=capitalizedSentence.substring(0,1);//提取首位字符if(a.matches("[A-Z]")){capitalizedSentenc
4、e=capitalizedSentence.replace("A","0");capitalizedSentence=capitalizedSentence.replace("B","1");capitalizedSentence=capitalizedSentence.replace("C","2");capitalizedSentence=capitalizedSentence.replace("D","3");capitalizedSentence=capitalizedSentence.replace("E","4");capitali
5、zedSentence=capitalizedSentence.replace("F","5");capitalizedSentence=capitalizedSentence.replace("G","6");capitalizedSentence=capitalizedSentence.replace("H","7");capitalizedSentence=capitalizedSentence.replace("I","8");capitalizedSentence=capitalizedSentence.replace("J","9"
6、);capitalizedSentence=capitalizedSentence.replace("K","!");capitalizedSentence=capitalizedSentence.replace("L","@");capitalizedSentence=capitalizedSentence.replace("M","#");capitalizedSentence=capitalizedSentence.replace("N","$");capitalizedSentence=capitalizedSentence.repla
7、ce("O","%");capitalizedSentence=capitalizedSentence.replace("P","^");capitalizedSentence=capitalizedSentence.replace("Q","&");capitalizedSentence=capitalizedSentence.replace("R","*");capitalizedSentence=capitalizedSentence.replace("S","(");capitalizedSentence=capitalizedSent
8、ence.replace("T",")");capitalizedSentence=capitalizedSentence.replace("U","
