TCP发送接收数据2

//客户端

package liu.net.tcp;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.Socket;

import java.net.UnknownHostException;

public class Client3 {

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

System.out.println("客户端启动。。。。");

//发数据给服务端

Socket s = new Socket("127.0.0.1",8899);

OutputStream out = s.getOutputStream();

out.write("client send data to server".getBytes());

//接收服务端的数据

InputStream in  = s.getInputStream();

byte[] buf = new byte[1024];

int len = in.read(buf);

String data = new String(buf,0,len);

System.out.println("从服务端收到的数据："+data);

s.close();

}

}

//服务器端

package liu.net.tcp;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class Server3 {

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

/* 客户端发送数据给服务端

*  服务端收到数据后发信息给客户端

*/

System.out.println("服务端启动。。。。");

//接收客户端发来的数据

ServerSocket ss = new ServerSocket(8899);

Socket s = ss.accept();

byte[] buf = new byte[1024];

InputStream in = s.getInputStream();

int len = in.read(buf);

String data = new String(buf,0,len);

System.out.println("服务端收到的数据："+data);

//发数据给客户端

String dataToClient = "11111";

OutputStream out = s.getOutputStream();

out.write(dataToClient.getBytes());

s.close();

ss.close();

}

}