TCP Send receive data (i)

TCP sends receive data

import java.io.IOException;

import Java.io.OutputStream;

import Java.net.Socket;

/*

* TCP protocol to send data:

* A: Create a send-side Socket Object

 *    This step, if successful, indicates that the connection has been established successfully.

* B: get output stream, write data

* C: Freeing Resources

*

 * The connection was rejected. the TCP protocol must look at the server first.

* Java.net.ConnectException:Connectionrefused:connect

*/

Public class Clientdemo {

Public static void main (string[] args)throws IOException {

// Create a send-side Socket Object

//Socket (inetaddress address, int port)

//Socket (String host, int port)

//Socket s = Newsocket (Inetaddress.getbyname ("192.168.12.92"), 8888);

Sockets = newSocket ("219.216.80.19", 8888);

// get output stream, write data

//Public OutputStream Getoutputstream ()

Outputstreamos = S.getoutputstream ();

Os.write ("hello,tcp, here I come ". GetBytes ());

// Freeing Resources

S.close ();

}

}

Import java.io.IOException;

Import Java.io.InputStream;

Import Java.net.ServerSocket;

Import Java.net.Socket;

/*

The *TCP protocol receives data:

* A: Create a Socket object on the receiving end

* B: Listens for client connections. Returns a corresponding socket object

* C: Get input stream, read data display in console

* D: Releasing resources

*/

public class Serverdemo {

publicstatic void Main (string[] args) throws IOException {

Create a socket object on the receiving end

ServerSocket (int port)

SERVERSOCKETSS = new ServerSocket (8888);

Listens for client connections. Returns a corresponding socket object

Public Socket Accept ()

Sockets = Ss.accept (); Listens for and accepts connections to this socket. This method is blocked until the connection is passed in.

Get input stream, read data display in console

Inputstreamis = S.getinputstream ();

Byte[]bys = new byte[1024];

Intlen = Is.read (bys); Blocking method

Stringstr = new String (bys, 0, Len);

STRINGIP = S.getinetaddress (). gethostaddress ();

System.out.println (ip+ "---" + str);

Freeing resources

S.close ();

Ss.close (); This should not be closed.

}

}

TCP Send receive plots:

TCP Send receive data (i)