Groovy example source code file (echo.java)

This example Groovy source code file (echo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

bufferedreader, echoclient, echoclient, echoserver, echoserver, exception, greeting, io, net, network, outputstream, serversocket, socket, socket, string, string, thread

The Groovy echo.java source code

// $Id: echo.java,v 1.1 2004-05-22 07:57:50 bfulgham Exp $
// http://www.bagley.org/~doug/shootout/
// author: Dirus@programmer.net

import java.io.*;
import java.net.*;

public class echo {
    public static void main(String[] args) throws Exception {
	int iIterations = 1;
	try {
	    iIterations = Integer.parseInt(args[0]);
	} catch(Exception e) { }

	EchoServer esServer = new EchoServer(0);
	new EchoClient(InetAddress.getLocalHost(), esServer.getPort(), iIterations);
    }
}

class EchoClient extends Thread {
    private static final String GREETING = "Hello there sailor\n";
    private final InetAddress inetaServer;
    private final int         iPort;
    private final int         iIterations;

    public EchoClient(InetAddress inetaServer, int iPort, int iIterations) {
	this.inetaServer = inetaServer;
	this.iPort = iPort;
	this.iIterations = iIterations;
	start();
    }

    public void run() {
	Socket socketFromServer = null;
	try {
	    socketFromServer = new Socket(inetaServer, iPort);
	    BufferedReader in = new BufferedReader(new InputStreamReader(socketFromServer.getInputStream()));
	    OutputStream out = socketFromServer.getOutputStream();

	    byte[] bytesOut = GREETING.getBytes();
	    String strIn = GREETING.trim();
	    for(int i = 0; i < iIterations; ++i) {
		out.write(bytesOut);
		out.flush();
		String strRead = in.readLine();
		if(!strRead.equals(strIn))
		    throw new RuntimeException("client: \"" + strIn + "\" ne \"" + strRead + "\"");
	    }
	} catch(Exception e) {
	    e.printStackTrace();
	}

	try {
	    socketFromServer.close();
	} catch(Exception e) { }
    }
}

class EchoServer extends Thread {
    private static final int   BUFFER_SIZE = 1024;
    private final ServerSocket ssAccepting;
    private final int          iPort;

    public EchoServer(int iPort) throws IOException {
	ssAccepting = new ServerSocket(iPort);
	this.iPort = ssAccepting.getLocalPort();
	start();
    }

    public final int getPort() {
	return iPort;
    }

    public void run() {
	byte bytesIn[] = new byte[BUFFER_SIZE];
	try {
	    Socket socketClient = ssAccepting.accept();
	    InputStream in = socketClient.getInputStream();
	    OutputStream out = socketClient.getOutputStream();
	    int iLength, iCount = 0;
	    while ((iLength = in.read(bytesIn)) != -1) {
		out.write(bytesIn, 0, iLength);
		out.flush();
		iCount += iLength;
	    }
	    System.out.println("server processed " + iCount + " bytes");
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }
}