Programes Related to Networking with Java

Program Related To Net Working  With Java.

Client Server Communication.

Server can send message to client.and client will display it.

 Source Code for Client :

import java.net.*;
import java.io.*;
class tcpip_client
{
public static void main(String args[]) throws IOException
{
Socket s=null;
BufferedReader b=null;

try
{
s=new Socket(InetAddress.getLocalHost(),98);
b=new BufferedReader(new InputStreamReader(s.getInputStream()));
}

catch(UnknownHostException u)
{
System.err.println("I don't know host");
System.exit(0);
}
String inp;
while((inp=b.readLine())!=null)
{
System.out.println(inp);
}
b.close();
s.close();
}
}

• Save the file with name tcpip_client.java 
• Compile with: javac tcpip_client.java

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 Source Code for Server :

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

class tcpip_server
{
public static void main(String args[]) throws IOException
{
ServerSocket n1=null;
try
{
n1=new ServerSocket(98);
}
catch(IOException e)
{
System.err.println("Port 98 could not be found");
System.exit(1);
}
Socket c=null;
try
{
c=n1.accept();
System.out.println("Connection from "+c);
}
catch(IOException e)
{
System.out.println("Accept failed");
System.exit(1);
}
PrintWriter out=new PrintWriter(c.getOutputStream(),true);
BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));
String n;
BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Ready to type now");
while((n=sin.readLine())!=null)
{
out.println(n);
}
out.close();
c.close();
n1.close();
}
}

• Save the file with name tcpip_server.java 
• Compile with: javac tcpip_server.java

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To Run:

• Open two CMD(Command Prompt).  One to run client program & one to run server program.
• First run server program then Only run client program.
• Run Server Program with: java tcpip_server
• Run Client Program with: java tcpip_client

Out Put is as following :

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