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经过一个多月枯燥的Java编程基础学习，终于学到net了，呵呵.. .. ..挺好玩

上服务器端程序：

TestTCPServer
package socketdemo;

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class TestTCPServer {
	public static void main(String[] args) throws IOException {
		ServerSocket ss = new ServerSocket(9999);
		while(true){
			System.out.println("----------服务端已经启动------------");
			Socket s = ss.accept();
//			System.out.println(s.getLocalPort()+"  "+s.getPort()+"  "+s.getLocalAddress().getHostAddress());
//			System.out.println(s.getInetAddress().getHostAddress()+":"+s.getPort()+
//					"客户端已经 连接上服务器ServerSocket");
			DataOutputStream dos = new DataOutputStream(s.getOutputStream());
			System.out.println("客户端【"+s.getInetAddress().getHostAddress()+"::"+s.getPort()+"】已经连接");
			dos.writeUTF("服务器端写入客户端的数据：客户端【"+s.getInetAddress().getHostAddress()+"::"+s.getPort()+
					"】已经连接上服务器端【"+s.getLocalAddress().getHostAddress()+"::"+s.getLocalPort()+"】！");
			dos.flush();
			dos.close();
			s.close();
		}
	}

}

运行结果：

上客户端程序：

TestTCPClient
package socketdemo;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

public class TestTCPClient {
	public static void main(String[] args)throws IOException {
		for(int i =0;i<5;i++){
			Socket s = new Socket("192.168.0.2",9999);
//			------------------------------------------
			DataInputStream dis = new DataInputStream(s.getInputStream());
			System.out.println("接收："+dis.readUTF());
			dis.close();
//			------------------------------------------
			s.close();
		}
	}
}