Something

import java.net.*;import java.io.*;public class KnockKnockServer {    public static void main(String[] args) throws IOException {                FileOutputStream out_file; // declare a file output object        PrintStream p; // declare a print stream object        Writer fw = null;                        // open socket        ServerSocket serverSocket = null;        try {            serverSocket = new ServerSocket(4444);        } catch (IOException e) {            System.err.println("Could not listen on port: 4444.");            System.exit(1);        }        // open socket end                                // wait for connections        Socket clientSocket = null;        try {            clientSocket = serverSocket.accept();        } catch (IOException e) {            System.err.println("Accept failed.");            System.exit(1);        }        // end                                        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));                        FileOutputStream fos = null;                try {                        //fis = new FileInputStream(args [0]);            fos = new FileOutputStream(args[0]);                        int byte_;            while ((byte_ = in.read()) != -1)                fos.write(byte_);        } catch (FileNotFoundException e) {            System.out.println("File not found");            // Do other stuff related to that exception (if necessary).        } catch (IOException e) {            System.out.println("I/O Problem: " + e.getMessage());            // Do other stuff related to that exception (if necessary).        } finally {            if (in != null)                try {                    in.close();                } catch (IOException e) {                }                        if (fos != null)                try {                    fos.close();                } catch (IOException e) {                }        }                                clientSocket.close();        serverSocket.close();    }            }