package cd.itcast.xieyi;

import java.io.IOException;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.Socket;

import java.net.UnknownHostException;

/*

 * tcp协议的socket

 *         socket(客户端),tcp的客户端一旦启动马上要与服务端建立连接。

 *         ServerSocket(服务端类)

 *

 * tcp客户端的使用步骤：

 */

public class Demo2Client {

    public static void main(String[] args) throws UnknownHostException, IOException {

        //建立tcp的客户端服务

        Socket socket = new Socket(InetAddress.getLocalHost(), 9090);

        //获得输出流对象

        OutputStream outputStream = socket.getOutputStream();

        //利用输出流写出数据

        outputStream.write("甘兴瑞您好！！".getBytes());

        //关闭资源

        socket.close();

    }

}

package cd.itcast.xieyi;

import java.io.IOException;

import java.io.InputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class Demo2Server {

    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = new ServerSocket(9090);

        //接受客户端连接,有等待特性，返回socket对象

        Socket socket = serverSocket.accept();

        //获得输入流

        InputStream inputStream = socket.getInputStream();

        //读入数据

        byte[] buf = new byte[1024];

        int length=0;

        length = inputStream.read(buf);

        System.out.println("服务端接受到的数据："+new String(buf,0,length));

        //关闭资源

        socket.close();

    }

}