服务端，运行时要先启动

java">package net.tcp;

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

public class ServerDemo {

	public static void main(String[] args) throws IOException {
		//通过server对象创建服务端，必须对外提供一个端口，否则客户端无法连接
		ServerSocket ss = new ServerSocket(10002);
		//获取客户端连接对象
		Socket s = ss.accept();  //阻塞式
		
		String ip = s.getInetAddress().getHostAddress();
		//读取客户端输入流 
		InputStream in = s.getInputStream();
		byte[] buf = new byte[1024];
		int len = in.read(buf);
		String text = new String(buf,0,len);
		System.out.println("server...");
		System.out.println(ip+":"+text);
		
		s.close();
		ss.close();
	}

}

客户端

java">package net.tcp;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class ClientDemo {

	public static void main(String[] args) throws UnknownHostException, IOException {
		//tcp 客户端，使用socket对象，建议一创建就明确目的地
		//自己的ip地址
		Socket socket = new Socket("10.1.35.73",10002);
		//获取socket中的输出流
		OutputStream out = socket.getOutputStream();
		
		out.write("i come tcp".getBytes());
		//只关这个就行了
		socket.close();
	}

}