Java Socket Program For EchoServer and EchoClient Commuincation
Java Socket Program For EchoServer and EchoClient Commuincation
EchoServer.java
import java.io.*;
import java.net.*;
public class EchoServer
{
public EchoServer(int portnum)
{
try
{
server = new ServerSocket(portnum);
}
catch (Exception err)
{
System.out.println(err);
}
}
public void serve()
{
try
{
while (true)
{
Socket client = server.accept();
BufferedReader r = new BufferedReader(new InputStreamReader(client.getInputStream()));
PrintWriter w = new PrintWriter(client.getOutputStream(), true);
w.println("Welcome to the Java EchoServer. Type 'bye' to close.");
String line;
do
{
line = r.readLine();
if ( line != null )
w.println("Got: "+ line);
}
while ( !line.trim().equals("bye") );
client.close();
}
}
catch (Exception err)
{
System.err.println(err);
}
}
public static void main(String[] args)
{
EchoServer s = new EchoServer(9999);
s.serve();
}
private ServerSocket server;
}
Echo.Client.java
import java.io.*;
import java.net.*;
public class EchoClient
{
public static void main(String[] args)
{
try
{
Socket s = new Socket("127.0.0.1", 9999);
BufferedReader r = new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter w = new PrintWriter(s.getOutputStream(), true);
BufferedReader con = new BufferedReader(new InputStreamReader(System.in));
String line;
do
{
line = r.readLine();
if ( line != null )
System.out.println(line);
line = con.readLine();
w.println(line);
}
while ( !line.trim().equals("bye") );
}
catch (Exception err)
{
System.err.println(err);
}
}
}
SAMPLE INPUT OUTPUT:
EchoServer
:/>javac EchoServer.java
:/>java EchoServer
:/>javac EchoServer.java
:/>java EchoServer
EchoClient
:/>javac EchoClient.java
:/>java EchoClient
:/>javac EchoClient.java
:/>java EchoClient
Welcome to the Java EchoServer. Type 'bye' to close.
HAI
Got: HAI
Hello
Got: Hello
bye
Press any key to continue ….
HAI
Got: HAI
Hello
Got: Hello
bye
Press any key to continue ….
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