Sockets or Networking in Java

Socket is the Java programming model to establish the communication link between two processes. A socket can hold input and output stream. A process sends data to another process through the network by writing to the output stream associated with the socket. A process reads data written the another process by reading from the input stream associated with the socket.

Code 5−7: The HostServer.java application

import java.net.*;
import java.io.*;

public class HostServer{
  public static void main (String [ ] args){
    ServerSocket s = null;
    try{
      s = new ServerSocket(5432);
      Socket s1 = s.accept();
      OutputStream s1out = s1.getOutputStream ();
      BufferedWriter bw = new BufferedWriter(new OutputStreamWriter (s1out 12 bw.write (”Hellow Net World”);
      bw.close();
      s1.close();
    }catch (IOException e){
      e.printStackTrac e ();
    }
  }
}

import java.net.*;
import java.io.*;

public class ClientServer{
  public static void main (String [ ] args){
    try{
       Socket s1 = new Socket(”127.0.0.1”, 5432);
       InputStream is = s1.get InputSt ream();
       DataInputStream dis = new DataInputStream(is);
       System.out.println(dis.readUTF());
       dis.close();
       s1.close();
    }catch (ConnectException e1){
       System.out.println(e1);
    }catch(IOException e2){
       e2.printStackTrace();
    }
  }
}