Program :To implement a echo Server that can handle multiple clients.

Algorithm

Server

Step 1: Start.
Step 2: Create a serversocket object.
Step 3: Create a socket object.
Step 4: Connect the socket object to DataOutputStream.
Step 5: Repeat steps 6 until ‘exit’ is typed.
Step 6: Sent message to client
Step 7: Close serversocket object
Step 8: Stop

Client

Step 1: Start
Step 2: Create a socket object.
Step 3: Get inputstream from server
Step 4: Print input from server
Step 5: Stop

Program

Server Program

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

class sthread extends Thread 
{
	Socket ssoc;
	DataOutputStream con;

	sthread(Socket so,DataOutputStream co)
	{
		super();
		ssoc=so;
		con=co;
	}

	public void run() 
	{
		DataOutputStream out=null;
		BufferedReader in=null;
		int len;
		System.out.println("Connection accepted at : " + ssoc);
		System.out.println("Server waiting for message from the client.....");
		try 
		{
			out =new DataOutputStream(ssoc.getOutputStream());
in = new BufferedReader(new InputStreamReader(ssoc.getInputStream()));
			String si;
			while(!(si = in.readLine()).equals("exit"))
			{
				len = si.length();
				for(int i=0;i
Output
Window 1 (Server)
java EchoServer

Server is running......

Connection accepted at : Socket[addr=/192.168.153.1,port=1061,localport=95]

Server waiting for message from the client.....

From client(Thread-0)=ram

From client(Thread-0)=sam

From client(Thread-0)=ravi

Connection accepted at : Socket[addr=/192.168.153.1,port=1062,localport=95]

Server waiting for message from the client.....

From client(Thread-1)=tom

From client(Thread-0)=pom

From client(Thread-1)=bob

Disconnected : Socket[addr=/192.168.153.1,port=1062,localport=95]

From client(Thread-0)=son

Disconnected : Socket[addr=/192.168.153.1,port=1061,localport=95]
Window 2 (Client)
java EchoClient

Connection established with : Socket[addr=freesoft/192.168.153.1,port=95,localport=1061]

Type "exit" to exit.....

ram

ram

sam

sam

ravi

ravi

pom

pom

son

son

exit

Disconnected..........
Window 3 (Client)
java EchoClient

Connection established with : Socket[addr=freesoft/192.168.153.1,port=95,localport=1062]

Type "exit" to exit.....

tom

tom

bob

bob

exit

Disconnected..........
Echo Server Java Program is a post from ShoutToWorld - Let's Learn Let's Shout - Helping bloggers and developers.