Socket Programming 3

import java.net.*;
import java.io.*;
public class client3 {
public static void main(String[] ar) {

int serverPort = 6666; // make sure you give the port number on which the server is listening.
String address = "127.0.0.1"; // this is the IP address of the server program's computer. // the address given here means "the same computer as the client".
try {
InetAddress ipAddress = InetAddress.getByName(address); // create an object that represents the above IP address.
System.out.println("Any of you heard of a socket with IP address " + address + " and port " + serverPort + "?");
Socket socket = new Socket(ipAddress, serverPort); // create a socket with the server's IP address and server's port.
System.out.println("Yes! I just got hold of the program.");
// Get the input and output streams of the socket, so that you can receive and send data to the client.
InputStream sin = socket.getInputStream();
OutputStream sout = socket.getOutputStream();
// Just converting them to different streams, so that string handling becomes easier.
DataInputStream in = new DataInputStream(sin);
DataOutputStream out = new DataOutputStream(sout);
// Create a stream to read from the keyboard.
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));

String line = null;
System.out.println("Type in something and press enter. Will send it to the server and tell ya what it thinks.");
System.out.println();

while(true) {
line = keyboard.readLine(); // wait for the user to type in something and press enter.

System.out.println("Sending this line to the server...");
out.writeUTF(line); // send the above line to the server.
out.flush(); // flush the stream to ensure that the data reaches the other end.
line = in.readUTF(); // wait for the server to send a line of text.

System.out.println("The server was very polite. It sent me this : " + line);
System.out.println("Looks like the server is pleased with us. Go ahead and enter more lines.");
System.out.println();
}
} catch(Exception x) {

x.printStackTrace();
}

}

}





import java.net.*;
import java.io.*;
public class server3 {
public static void main(String[] ar) {

int port = 6666; // just a random port. make sure you enter something between 1025 and 65535.

try {
ServerSocket ss = new ServerSocket(port); // create a server socket and bind it to the above port number.
System.out.println("Waiting for a client...");

Socket socket = ss.accept(); // make the server listen for a connection, and let you know when it gets one.

System.out.println("Got a client :) ... Finally, someone saw me through all the cover!");
System.out.println();

// Get the input and output streams of the socket, so that you can receive and send data to the client.
InputStream sin = socket.getInputStream();
OutputStream sout = socket.getOutputStream();

// Just converting them to different streams, so that string handling becomes easier.
DataInputStream in = new DataInputStream(sin);
DataOutputStream out = new DataOutputStream(sout);

String line = null;
while(true) {

line = in.readUTF(); // wait for the client to send a line of text.
System.out.println("The dumb client just sent me this line : " + line);
if(line!=null){
File file=new File(line);
if(file.exists()){
System.out.println("file is " +file.length()+ "bytes long");
}
}

System.out.println("I'm sending it back...");

out.writeUTF(line); // send the same line back to the client.
out.flush(); // flush the stream to ensure that the data reaches the other end.

System.out.println("Waiting for the next line...");
System.out.println();
}

} catch(Exception x) {

x.printStackTrace();
}

}

}