tcp与udp客户服务端实现大小写及socket编程实现聊天程序

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1、.1.TCP实现大小写转换代码如下importjava.io.*;importjava.net.*;classTCPServer{publicstaticvoidmain(Stringargv[])throwsException{StringClientSentence;StringcapitalizedSentence;@SuppressWarnings("resource")ServerSocketwelcomeSocket=newServerSocket(8998);while(true){SocketconnectionSocket=we

2、lcomeSocket.accept();BufferedReaderinfromClient=newBufferedReader(newInputStreamReader(connectionSocket.getInputStream()));DataOutputStreamoutToClient=newDataOutputStream(connectionSocket.getOutputStream());ClientSentence=infromClient.readLine();capitalizedSentence=ClientSent

3、ence.toUpperCase()+'';outToClient.writeBytes(capitalizedSentence);}}} TCP服务器代码： importjava.io.*;importjava.net.*;classTCPClient{publicstaticvoidmain(Stringargv[])throwsException{Stringsentence;StringmodifiedSentence;BufferedReaderinfromUser=newBufferedReader(newInputStreamR

4、eader(System.in));SocketclientSocket=newSocket("127.0.0.1",8998);DataOutputStreamoutToServer=newDataOutputStream(clientSocket.getOutputStream());...BufferedReaderinfromServer=newBufferedReader(newInputStreamReader(clientSocket.getInputStream()));sentence=infromUser.readLine()

5、;outToServer.writeBytes(sentence+'');modifiedSentence=infromServer.readLine();System.out.println("FROMSERVER:"+modifiedSentence);clientSocket.close();}}运行结果截图:1.UDP实现大小写转换...UDPServer短代码：importjava.net.*;importjava.io.*;publicclassServer{publicstaticvoidmain(Stringargs[])th

6、rowsSocketException,IOException{DatagramSocketsocket;DatagramPacketpacket;byte[]buf=newbyte[256];intport;InetAddressadd;socket=newDatagramSocket(8888);packet=newDatagramPacket(buf,buf.length);booleanb=true;while(b){socket.receive(packet);Strings=newString(packet.getData()).tr

7、im();System.out.println("服务器接受数据为："+s);//Stringstr=s-('a'-'A');Stringstr=s.toUpperCase();s=String.valueOf(str);buf=s.getBytes();packet=newDatagramPacket(buf,buf.length,packet.getAddress(),packet.getPort());socket.send(packet);}socket.close();}}UDP客户端代码：importjava.net.*;import

8、java.io.*;publicclassClient{publicstaticvoidmain(Stringargs[])throws