TCP socket (Echo server & Client)

CLIENT PROGRAM:

import  java.io.*;
import  java.net.*;
public class tcpclient
{
public final static int DEFAULT_PORT=10001;
public static void main(String arg[])throws Exception
{
String str;
System.out.println("enterthe string to echo");
 BufferedReader Stream=new BufferedReader(new InputStreamReader(System.in));
String hostname="127.0.0.1";
 try
{
str=Stream.readLine();
System.out.println("connecting to host " +hostname);
Socket s= new Socket(hostname,DEFAULT_PORT);
PrintStream out= new PrintStream(s.getOutputStream());
BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
out.println(str);
String line=in.readLine();
while(line!=null)
{
System.out.println("received from server " +line);
line=in.readLine();
}
s.close();
}
catch(SocketException e)
{
System.out.println("socketerror "+e);
}
catch(UnknownHostException e)
{
System.err.println("invalid host");
}
catch(IOException e)
{
System.err.println("ioerror" +e);
}}}

SERVER PROGRAM:

import  java.io.*;
import  java.net.*;
import java.util.Date.*;
class tcpserver
{
 public final static int DEFAULT_PORT=10001;
public static void main(String []args)throws Exception
{
int port=DEFAULT_PORT;
try
 {
ServerSocket server=new  ServerSocket(port);
Socket connection=null;
while(true)
{
try
{
connection=server.accept();
System.out.println("accept connection from "+connection.getPort());
OutputStreamWriter out=new OutputStreamWriter(connection.getOutputStream());
BufferedReader in= new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line=in.readLine();
 while(line==null)
line=in.readLine();
System.out.println(line + "was echoed");
out.write(line);
out.flush();
connection.close();
 }
catch(IOException e)
{}
finally
{
try
{
if(connection!=null)
connection.close();
}
catch(IOException e)
{
}}}}
catch(IOException e)
{
System.err.println(e);
}}}


OUTPUT:

pgm_1a.docx
File Size:	62 kb
File Type:	docx

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