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    <p>This is the echo server handling multiple clients... Runs fine and good using Threads</p> <pre><code>// echo server import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; public class Server_X_Client { public static void main(String args[]){ Socket s=null; ServerSocket ss2=null; System.out.println("Server Listening......"); try{ ss2 = new ServerSocket(4445); // can also use static final PORT_NUM , when defined } catch(IOException e){ e.printStackTrace(); System.out.println("Server error"); } while(true){ try{ s= ss2.accept(); System.out.println("connection Established"); ServerThread st=new ServerThread(s); st.start(); } catch(Exception e){ e.printStackTrace(); System.out.println("Connection Error"); } } } } class ServerThread extends Thread{ String line=null; BufferedReader is = null; PrintWriter os=null; Socket s=null; public ServerThread(Socket s){ this.s=s; } public void run() { try{ is= new BufferedReader(new InputStreamReader(s.getInputStream())); os=new PrintWriter(s.getOutputStream()); }catch(IOException e){ System.out.println("IO error in server thread"); } try { line=is.readLine(); while(line.compareTo("QUIT")!=0){ os.println(line); os.flush(); System.out.println("Response to Client : "+line); line=is.readLine(); } } catch (IOException e) { line=this.getName(); //reused String line for getting thread name System.out.println("IO Error/ Client "+line+" terminated abruptly"); } catch(NullPointerException e){ line=this.getName(); //reused String line for getting thread name System.out.println("Client "+line+" Closed"); } finally{ try{ System.out.println("Connection Closing.."); if (is!=null){ is.close(); System.out.println(" Socket Input Stream Closed"); } if(os!=null){ os.close(); System.out.println("Socket Out Closed"); } if (s!=null){ s.close(); System.out.println("Socket Closed"); } } catch(IOException ie){ System.out.println("Socket Close Error"); } }//end finally } } </code></pre> <p>Also here is the code for the client.. Just execute this code for as many times as you want to create multiple client.. </p> <pre><code>// A simple Client Server Protocol .. Client for Echo Server import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.InetAddress; import java.net.Socket; public class NetworkClient { public static void main(String args[]) throws IOException{ InetAddress address=InetAddress.getLocalHost(); Socket s1=null; String line=null; BufferedReader br=null; BufferedReader is=null; PrintWriter os=null; try { s1=new Socket(address, 4445); // You can use static final constant PORT_NUM br= new BufferedReader(new InputStreamReader(System.in)); is=new BufferedReader(new InputStreamReader(s1.getInputStream())); os= new PrintWriter(s1.getOutputStream()); } catch (IOException e){ e.printStackTrace(); System.err.print("IO Exception"); } System.out.println("Client Address : "+address); System.out.println("Enter Data to echo Server ( Enter QUIT to end):"); String response=null; try{ line=br.readLine(); while(line.compareTo("QUIT")!=0){ os.println(line); os.flush(); response=is.readLine(); System.out.println("Server Response : "+response); line=br.readLine(); } } catch(IOException e){ e.printStackTrace(); System.out.println("Socket read Error"); } finally{ is.close();os.close();br.close();s1.close(); System.out.println("Connection Closed"); } } } </code></pre>
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    1. POsocket programming multiple client to one server
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