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在《计算机网络-自顶向下方法 》第四版的2.7 2.8两节的TCP和UDP套接字编程练习中有下面的源码：

< 一>UDP socket

package UDP;

import java.io.*; import java.net.*; public class Client { public static void main(String[] args) throws IOException { BufferedReader infromuser = new BufferedReader(new InputStreamReader(System.in));//定义一个缓冲字符输入流，以子结转字符为参数构造 DatagramSocket clientSocket = new DatagramSocket();//创建套接字 InetAddress ipaddress = InetAddress.getByName("localhost");//获取主机ip地址 byte[] sendData = new byte[1024]; byte[] recievedData = new byte[1024]; String sentence = infromuser.readLine(); sendData = sentence.getBytes(); DatagramPacket sendpacket = new DatagramPacket(sendData,sendData.length,ipaddress,9876);//生成数据包 clientSocket.send(sendpacket); DatagramPacket recievedpacket = new DatagramPacket(recievedData,recievedData.length);//从主机接受数据包 clientSocket.receive(recievedpacket); String modifiedsentence = new String(recievedpacket.getData()); System.out.println(modifiedsentence); clientSocket.close(); } }

package UDP;

import java.io.*; import java.net.*; public class Server { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub DatagramSocket serversocket = new DatagramSocket(9876); byte[] recievedata = new byte[1024]; byte[] senddata = new byte[1024]; while(true) { DatagramPacket recievedpPacket = new DatagramPacket(recievedata,recievedata.length); serversocket.receive(recievedpPacket); String sentence = new String(recievedpPacket.getData()); InetAddress ipaddress = recievedpPacket.getAddress(); int port = recievedpPacket.getPort(); String capitalizedsentence = sentence.toUpperCase(); senddata = capitalizedsentence.getBytes(); DatagramPacket sendpacket = new DatagramPacket(senddata, senddata.length,ipaddress,port); serversocket.send(sendpacket); } } }

< 二> TCP socket

package socket;

import  java.io.*; import java.net.*; public class Server { public static void main(String[] args) throws IOException { String clientSentence; String  capitalizedSentence; ServerSocket welcomeSocket = new ServerSocket(6789); while (true) { Socket connectionSocket = welcomeSocket.accept(); BufferedReader infromclient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream())); System.out.println("accept \n"); DataOutputStream outToclient = new DataOutputStream(connectionSocket.getOutputStream()); clientSentence =infromclient.readLine(); System.out.println("get client string "+ clientSentence+"\n"); capitalizedSentence = clientSentence.toUpperCase()+"\n"; outToclient.writeBytes(capitalizedSentence); } } }

package socket;

import java.io.*; import java.net.*; public class CLient0 { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub String hostname = "localhost"; int portNUM = 6789; String sentence ; String modifiedStentence; BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); Socket clientsocket =  new Socket(hostname,portNUM); BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientsocket.getInputStream())); DataOutputStream outToserver = new DataOutputStream(clientsocket.getOutputStream()); sentence = inFromUser.readLine(); outToserver.writeBytes(sentence+"\n"); modifiedStentence = inFromServer.readLine(); System.out.println("FROM SERVER:"+modifiedStentence); clientsocket.close(); } }

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