Introduction Socket and RMI are two techniques used in Java for the purpose of I

Question

Introduction

Socket and RMI are two techniques used in Java for the purpose of IPC. These are used to establish two-way communication between two running programs, which are typically a client and a server, which are running on the network. Actually, they work in quite different ways principally.

Socket is a way to send data (only data, not methods) on a port to a different host. The protocol can be defined by the user

RMI is a technology in which the methods of remote Java objects can be invoked from other Java virtual machines running on different hosts.

In this lab, you will learn more about client-server communication programs based on both Java Socket.   

Using Sockets

Learning about sockets

Read the following resource carefully to learn about sockets:

http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

If you never did any network programming in Java, it may be a good idea to read some more:

http://java.sun.com/docs/books/tutorial/networking/index.html

You may want to have a look at other information:

http://de.wikipedia.org/wiki/Socket
http://www.javaworld.com/javaworld/jw-12-1996/jw-12-sockets.html https://stackoverflow.com/questions/10069059/is-it-possible-to-run-a-socket-server-and-socket-client-on-the-same-machine

Client / Server Communication

You need to understand the methods and packages to write client program and a server program.

Try to design and implement java classes required to do socket communication, like:

SocketClient.java: This class connects to the server and communicates with it according to the ClientProtocol

ClientProtocol.java: This class describes how your client reacts to your servers messages

SocketServer.java: This class sets up a socket listening for the client to connect - and communicates with the client

ServerProtocol.java: This class describes how the server reacts to the messages of the client

Have the two classes pass some sample data back and forth between them.

Results:

Hand in:.

A print out of the programs;

A printout of the output of running programs (screen capture)

Explanation / Answer

SocketServer.java

import java.io.*;  

import java.net.*;  

public class SocketServer {  

public static void main(String[] args){  

try{  

ServerSocket ss=new ServerSocket(6666);  

Socket s=ss.accept();//establishes connection   

ServerProtocol sp=new ServerProtocol();

sp.messgae(s)

ss.close();  

}catch(Exception e){System.out.println(e);}  

}  

}  

ServerProtocol.java

class ServerProtocol

{

public void message(Socket s)

{

try{

DataInputStream dis=new DataInputStream(s.getInputStream());  

String  str=(String)dis.readUTF();  

System.out.println("message= "+str);  

dis.close();

}

catch(Exception e){System.out.println(e);}  

}  

}

}

SocketClient.java

import java.io.*;  

import java.net.*;  

public class MyClient {  

public static void main(String[] args) {  

try{      

Socket s=new Socket("localhost",6666);  

ClientProtocol cp=new ClientProtocol();

cp.message(s);

s.close();  

}catch(Exception e){System.out.println(e);}  

}  

}

ClientProtocol.java

class ClientProtocol

{

public void message(Socket s)

{

try{

DataOutputStream dout=new DataOutputStream(s.getOutputStream());  

dout.writeUTF("Hello Server");  

dout.flush();  

dout.close();  

}

catch(Exception e){System.out.println(e);}  

}  

}

}

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