Question

Build a server application which will reverse the order of a string received from a client. When client connects, a new thread is started to handle an interactive dialog in which the client sends

in a string input by the user and the server thread sends back the letters of the string in reverse order. Allow the client to send 10 Strings.

In Java.

Answer 1

UDPClient.java:-
importjava.io.*;
importjava.net.*;
classUDPClient
{
publicstaticvoidmain(Stringargs[])throwsException
{
BufferedReaderinFromUser=
newBufferedReader(newInputStreamReader(System.in));
DatagramSocketclientSocket=newDatagramSocket();
InetAddressIPAddress=InetAddress.getByName("localhost");
byte[]sendData=newbyte[1024];
byte[]receiveData=newbyte[1024];
Stringsentence=inFromUser.readLine();
sendData=sentence.getBytes();
DatagramPacketsendPacket=newDatagramPacket(sendData,sendData.length,IPAddress,
9876);
clientSocket.send(sendPacket);
DatagramPacketreceivePacket=newDatagramPacket(receiveData,receiveData.length);
clientSocket.receive(receivePacket);
StringmodifiedSentence=newString(receivePacket.getData());
System.out.println("FROMSERVER:"+modifiedSentence);
clientSocket.close();
}
}
UDPServer.java:-
importjava.io.*;
importjava.net.*;
classUDPServer
{
publicstaticvoidmain(Stringargs[])throwsException
{
DatagramSocketserverSocket=newDatagramSocket(9876);
byte[]receiveData=newbyte[1024];
byte[]sendData=newbyte[1024];
while(true)
{
DatagramPacketreceivePacket=newDatagramPacket(receiveData,
receiveData.length);
serverSocket.receive(receivePacket);
Stringsentence=newString(receivePacket.getData());
System.out.println("RECEIVED:"+sentence);
InetAddressIPAddress=receivePacket.getAddress();
intport=receivePacket.getPort();
StringreverseSentence=sentence.reverse();
sendData=capitalizedSentence.getBytes();
DatagramPacketsendPacket=
newDatagramPacket(sendData,sendData.length,IPAddress,port);
serverSocket.send(sendPacket);
System.out.println("ModifiedmessagepassedtoUDPclient");
}
}