fun.

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

public class EchoServer {
    private ServerSocket server;

    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);
                        System.out.println(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();
    }
}



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 = con.readLine();
                w.println(line);
                if (!line.trim().equals("bye")) {
                    line = r.readLine();
                    if (line != null)
                        System.out.println(line);
                }
            } while (!line.trim().equals("bye"));
        } catch (Exception err) {
            System.err.println(err);
        }
    }
}


Popular posts from this blog

Ads

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>RSA Encryption</title> </head> <body> <center>   <h1>RSA Encryption</h1>   <form id="rsaForm">     <label for="p">Enter First Prime Number:</label>     <input type="number" id="p" value="53"><br>     <label for="q">Enter Second Prime Number:</label>     <input type="number" id="q" value="59"><br>     <label for="msg">Enter Message (Cipher Text):</label>     <input type="number" id="msg" value="89"><br>     <button type="button" onclick="RSA()">Apply RSA</button>   </form>   <hr>   <div i...
Read more

4a Reading data from Textfile

file1 = open("myfile.txt","w") L = ["seek(n) takes the file handle to the nth bite from the beginning. \n","This is Paris \n","This is London \n"] # \n is placed to indicate EOL (End of Line) file1.write("Hello \nThis program manipulates text file\n") file1.writelines(L) file1.close() #to change file access modes     file1 = open("myfile.txt","r+") print("Output of Read function is ") print(file1.read()) print() # seek(n) takes the file handle to the nth # bite from the beginning. file1.seek(0) print( "Output of Readline function is ") print(file1.readline()) print() file1.seek(0) # To show difference between read and readline print("Output of Read(9) function is ") print(file1.read(9)) print() file1.seek(0) print("Output of Readline(9) function is ") print(file1.readline(9)) file1.seek(0) # readlines function print("Output of Readlines function is ") prin...
Read more

Execute Basic Numpy operations

import numpy as np print(‘numpy version’, np.__version__) print(np.zeros(10, dtype='int')) print(np.ones((3,5), dtype=float)) print(np.full((3,5),1.23)) print('arange]n',np.arange(0, 21, 3)) print(np.linspace(0, 1, 5)) print(np.random.normal(0, 1, (3,3))) print(np.eye(3)) print(np.random.seed(0)) x1 = np.random.randint(10, size=6) #one dimension x2 = np.random.randint(10, size=(3,4)) #two dimension x3 = np.random.randint(10, size=(3,4,5)) #three dimension print(‘1d array’, x1) print(‘2d array’, x2) print(‘3d array’, x3) print("x3 ndim:", x3.ndim) print("x3 shape:", x3.shape) print("x3 size: ", x3.size) x = np.where(x1 == 4) print('Find the indexes where the value is 4:',x) print('after sorting array x1 ',np.sort(x1)) for i in x1:   print(i)   arr = np.concatenate((x2, x2), axis=1) print('After concatenating x2 and x2 arrays vertically', arr) newarr = np.array_split(arr, 3, axis=1) print(newarr) print('first elem...
Read more