package day35_net_网络编程.tcp传输;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.Socket;

import java.net.UnknownHostException;

/*

     需求：使用TCP协议发送数据，并将接收到的数据转换成大写返回

     客户端发出数据

     服务端接收数据

     服务端转换数据

     服务端发出数据

     客户端接收转换后的数据

 */

public class Cast_ClientDemo {

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

        Socket s = new Socket(InetAddress.getByName("MININT-79LU01A"),8880);

        //发出数据

        OutputStream os = s.getOutputStream();

        byte[] bts = "hello ,tcp cast".getBytes();

        os.write(bts);

        //接收转换后的数据

        InputStream is = s.getInputStream();

        byte[] upbts = new byte[1024];

        int len = is.read(upbts);

        String upstr = new String(upbts,0,len);

        System.out.println(upstr);

        //释放资源（Socket）

        s.close();

    }

}

package day35_net_网络编程.tcp传输;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

/*

服务端接收数据

服务端转换数据

服务端发出数据*/

public class Cast_ServerDemo {

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

        ServerSocket ss = new ServerSocket(8880);

        Socket s = ss.accept();//阻塞

        //接收数据

        InputStream is = s.getInputStream();

        byte[] bts = new byte[1024];

        int len = is.read(bts);

        String str = new String(bts,0,len);

        System.out.println(str);

        //转换数据

        String upstr = str.toUpperCase();

        //发出数据

        OutputStream os = s.getOutputStream();

        os.write(upstr.getBytes());

        //释放资源(Socket)

        s.close();

    }

}