编写Server和Client间的通话，首先Server要启动ServerSocket，Client端要启动Socket，然后Server端要不断的accept（）；然后他们间的通话用流的形式传递，用DataInputStream or DataOutputStream，中的readUTF()和writeUTF（）方法.最后还要关闭流，关闭Socket.还不要忘了还要处理异常。代码如下：

import java.net.*;import java.io.*;public class TcpClient {	public static void main(String[] args) {		try {			Socket ss = new Socket("127.0.0.1", 6666);			DataInputStream di = new DataInputStream(ss.getInputStream());			DataOutputStream dz = new DataOutputStream(ss.getOutputStream());			dz.writeUTF("我爱你");			dz.flush();			System.out.println(di.readUTF());			di.close();			dz.close();			ss.close();		} catch (IOException e) {			System.exit(0);		}	}}

import java.net.*;import java.io.*;public class TcpServer {	public static void main(String[] args) {		try {			ServerSocket ss = new ServerSocket(6666);			while (true) {				Socket s = ss.accept();		System.out.println("已经连上了");				DataOutputStream ds = new DataOutputStream(s.getOutputStream());				DataInputStream di = new DataInputStream(s.getInputStream());				String z="";z=di.readUTF();				if (z!= null) {					System.out.println(z);					System.out.println("我收到了");				}				ds.writeUTF("你好吗");				ds.flush();				ds.close();				di.close();				s.close();			}		} catch (IOException e) {			System.exit(-1);		}	}}