An Echo Server Based on TCP Sockets - Java Network

Java examples for Network:TCP

  1. HOME
  2. Java
  3. Network
  4. TCP

Description

An Echo Server Based on TCP Sockets

Demo Code

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class Main {
  public static void main(String[] args) {
    try {/*from  w  ww  . j  a  v  a  2  s  .  c o m*/
      ServerSocket serverSocket = new ServerSocket(12900, 100,
          InetAddress.getByName("localhost"));
      System.out.println("Server started at: " + serverSocket);

      while (true) {
        System.out.println("Waiting for a connection...");
        Socket activeSocket = serverSocket.accept();
        System.out.println("Received a connection from " + activeSocket);
        Runnable runnable = () -> handleClientRequest(activeSocket);
        new Thread(runnable).start();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  public static void handleClientRequest(Socket socket) {
    BufferedReader socketReader = null;
    BufferedWriter socketWriter = null;
    try {
      socketReader = new BufferedReader(new InputStreamReader(
          socket.getInputStream()));
      socketWriter = new BufferedWriter(new OutputStreamWriter(
          socket.getOutputStream()));

      String inMsg = null;
      while ((inMsg = socketReader.readLine()) != null) {
        System.out.println("Received from client: " + inMsg);
        String outMsg = inMsg;
        socketWriter.write(outMsg);
        socketWriter.write("\n");
        socketWriter.flush();
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        socket.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}

Result


Related Tutorials