Finger Server : NIO Socket « Network Protocol « Java

1. Java
2. Network Protocol
3. NIO Socket

Finger Server

  
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.util.Iterator;
import java.util.Set;

public class NewFingerServer {
  private static void readPlan(String userName, PrintWriter pw) throws Exception {
    FileReader file = new FileReader(userName + ".plan");
    BufferedReader buff = new BufferedReader(file);
    boolean eof = false;
    pw.println("\nUser name: " + userName + "\n");
    while (!eof) {
      String line = buff.readLine();
      if (line == null)
        eof = true;
      else
        pw.println(line);
    }
    buff.close();
  }

  public static void main(String[] arguments) throws Exception {
    ServerSocketChannel sockChannel = ServerSocketChannel.open();
    sockChannel.configureBlocking(false);

    InetSocketAddress server = new InetSocketAddress("localhost", 79);
    ServerSocket socket = sockChannel.socket();
    socket.bind(server);

    Selector selector = Selector.open();
    sockChannel.register(selector, SelectionKey.OP_ACCEPT);

    while (true) {
      selector.select();
      Set keys = selector.selectedKeys();
      Iterator it = keys.iterator();
      while (it.hasNext()) {
        SelectionKey selKey = (SelectionKey) it.next();
        it.remove();
        if (selKey.isAcceptable()) {
          ServerSocketChannel selChannel = (ServerSocketChannel) selKey.channel();
          ServerSocket selSocket = selChannel.socket();
          Socket connection = selSocket.accept();
          
          InputStreamReader isr = new InputStreamReader(connection.getInputStream());
          BufferedReader is = new BufferedReader(isr);
          PrintWriter pw = new PrintWriter(new BufferedOutputStream(connection.getOutputStream()), false);
          pw.println("NIO Finger Server");
          pw.flush();
          String outLine = null;
          String inLine = is.readLine();
          if (inLine.length() > 0) {
            outLine = inLine;
          }
          readPlan(outLine, pw);
          pw.flush();
          pw.close();
          is.close();
          
          connection.close();
        }
      }
    }
  }
}
        

   
  

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