Transcript CS 471/571

CS 471/571
Sockets 2
UDP Client
from socket import *
serverName = ‘localhost’
serverPort = 12000
clientSocket = socket(AF_INET,
SOCK_DGRAM)
message = raw_input(’Input lowercase sentence:’)
clientSocket.sendto(message,(serverName, serverPort))
modifiedMessage, serverAddress =
clientSocket.recvfrom(2048)
print modifiedMessage
clientSocket.close()
UDP Server
from socket import *
serverPort = 12000
serverSocket = socket(AF_INET, SOCK_DGRAM)
serverSocket.bind(('', serverPort))
print “The server is ready to receive”
while 1:
message, clientAddress = serverSocket.recvfrom(2048)
modifiedMessage = message.upper()
serverSocket.sendto(modifiedMessage, clientAddress)
TCP Client
from socket import *
serverName = ’localhost’
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_STREAM)
clientSocket.connect((serverName,serverPort))
sentence = raw_input(‘Input lowercase sentence:’)
clientSocket.send(sentence)
modifiedSentence = clientSocket.recv(1024)
print ‘From Server:’, modifiedSentence
clientSocket.close()
TCP Server
from socket import *
serverPort = 12000
serverSocket = socket(AF_INET,SOCK_STREAM)
serverSocket.bind((‘’,serverPort))
serverSocket.listen(1)
print ‘The server is ready to receive’
while 1:
connectionSocket, addr = serverSocket.accept()
sentence = connectionSocket.recv(1024)
capitalizedSentence = sentence.upper()
connectionSocket.send(capitalizedSentence)
connectionSocket.close()
Java UDP Client
import java.io.*;
import java.net.*;
public class EchoClientUDP {
public static void main(String[] args) throws Exception {
DatagramSocket mySock = new DatagramSocket();
byte[] bytesToSend = args[0].getBytes();
InetAddress serverIP = InetAddress.getByName("localhost");
DatagramPacket sendPacket = new DatagramPacket(bytesToSend,
bytesToSend.length, serverIP, 12000);
DatagramPacket receivePacket = new DatagramPacket(new
byte[bytesToSend.length] , bytesToSend.length);
mySock.send(sendPacket);
mySock.receive(receivePacket);
System.out.println(new String(receivePacket.getData()));
mySock.close();
}
}
Java UDP Server
import java.io.*;
import java.net.*;
public class EchoServerUDP {
public static void main(String[] args) throws Exception {
DatagramSocket mySock = new DatagramSocket(12000);
DatagramPacket packet = new DatagramPacket(new byte[100], 100);
mySock.receive(packet);
String msg = new String(packet.getData());
msg = msg.toUpperCase();
packet.setData(msg.getBytes());
mySock.send(packet);
mySock.close();
}
}
Java TCP Client
import java.io.*;
import java.net.*;
public class EchoClient {
public static void main(String[] args) throws Exception {
Socket mySock = new Socket("localhost", 12000);
BufferedReader in = new BufferedReader(
new InputStreamReader(mySock.getInputStream()));
PrintStream out = new PrintStream( mySock.getOutputStream());
String msg = args[0];
out.println(msg);
System.out.println(in.readLine());
mySock.close();
}
}
Java TCP Server
import java.io.*;
import java.net.*;
public class EchoServer {
public static void main(String[] args) throws Exception {
ServerSocket mySock = new ServerSocket(12000);
Socket client = mySock.accept();
BufferedReader in = new BufferedReader(
new InputStreamReader(client.getInputStream()));
PrintStream out = new PrintStream( client.getOutputStream());
String msg = in.readLine();
msg = msg.toUpperCase();
out.println(msg);
client.close();
mySock.close();
}
}