java socket (sever side)

import java.net.*;
import java.io.*;
public class server{
 public static void main(String args[])throws IOException{
  ServerSocket s=new ServerSocket(1234);
  while(true){
   Socket s1=s.accept();
   DataInputStream is=new DataInputStream(s1.getInputStream());
   String sr=new String(is.readUTF());
   System.out.println(sr);
   DataOutputStream os=new DataOutputStream(s1.getOutputStream());
   os.writeUTF("bla bla bla");
   os.close();
   is.close();
   s1.close();
    
  }
 }
}