Java Socket Programming instance (i)-TCP basic use _java

one. Server-side code:

Import java.net.*; For Socket, ServerSocket, and inetaddress import java.io.*; For IOException and Input/outputstream public class Tcpechoserver {private static final int bufsize =//S 
 
    Ize of receive buffer public static void main (string[] args) throws IOException {int servport = 5500; 
 
    Create a server socket to accept client connection requests ServerSocket Servsock = new ServerSocket (servport); int recvmsgsize; Size of received message byte[] ReceiveBuf = new Byte[bufsize]; Receive buffer while (true) {//Run forever, accepting and servicing connections Socket Clntsock = Servs Ock.accept (); 
      Get Client connection SocketAddress clientaddress = clntsock.getremotesocketaddress (); 
 
      SYSTEM.OUT.PRINTLN ("Handling client at" + clientaddress); 
      InputStream in = Clntsock.getinputstream (); 
 
      OutputStream out = Clntsock.getoutputstream (); Receive until client closes connectiOn, indicated By-1 return while (recvmsgsize = In.read (receivebuf))!=-1) {out.write (receivebuf, 0, re 
      Cvmsgsize); } clntsock.close (); Close the socket. 
    We are done with this client!  }/* not reached */}}

two. Client code:

Import java.net.*; 
 
Import java.io.*; public class Tcpechoclient {public static void main (string[] args) throws IOException {String Server = ' 127. 0.0.1 "; Server name or IP address int servport = 5500; 
 
    Server Port byte[] data = "Hi, World". GetBytes (); 
    Create socket: Connected to server on specified port socket = new Socket (server, servport); 
 
    System.out.println ("Connected to server...sending Echo string"); 
    InputStream in = Socket.getinputstream (); 
 
    OutputStream out = Socket.getoutputstream (); Out.write (data); Send the encoded string to the server//Receive the same string back from the server int TOTALBYTESRCVD = 0; Total Bytes received so far int bytesrcvd; Bytes received in last read while (Totalbytesrcvd < data.length) {if (BYTESRCVD = In.read (data, Totalb YTESRCVD, data.length-totalbytesrcvd) = = = 1) throw new SocketException ("Connection closed Prematurely "); 
    TOTALBYTESRCVD + = BYTESRCVD; 
    }//Data array is full SYSTEM.OUT.PRINTLN ("Received:" + new String (data)); Socket.close ();  Close the socket and its streams}}

The TCP server for the above code is single-threaded and can only serve one client at a time.

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