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Server.java

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/*********************

* Socket Server

* @file Server.java

* @author Wangai

**********************/

import java.net.*;

import java.io.*;

public class Server extends Thread {

private ServerSocket serverSocket;

public Server(int port) throws IOException {

serverSocket = new ServerSocket(port);

serverSocket.setSoTimeout(1000000);

}

public static void main(String [] args) {

int port = Integer.parseInt(args[0]);

try {

// ? do this in a seperate process?

Thread t = new Server(port);

t.start();

} catch (IOException e) {

e.printStackTrace();

}

}

public void run() {

while(true) {

try {

System.out.println("Waiting for client on port " +

serverSocket.getLocalPort());

Socket server = serverSocket.accept();

System.out.println("Just connected to " + server.getRemoteSocketAddress());

DataInputStream input = new DataInputStream(server.getInputStream());

DataOutputStream output = new DataOutputStream(server.getOutputStream());

// initial interaction ** send menu

output.writeUTF("\n\nSERVER>\n" + menu());

int service = input.readInt();

int input1 = input.readInt();

int input2 = input.readInt();

/*

System.out.println("service: " + service);

System.out.println("input1: " + input1);

System.out.println("input2: " + input2);

*/

do {

// ** evaluate request

if (service == 0) {

break; // from do while

} else if (service == 1) {

output.writeUTF("\n\nSERVER>\n" + menu());

} else if (service == 2) {

output.writeUTF("SERVER>\n\t " + add(input1, input2));

} else if (service == 3) {

output.writeUTF("SERVER>\n\t " + diff(input1, input2));

} else if (service == 4) {

output.writeUTF("SERVER>\n\t " + mult(input1, input2));

} else if (service == 5) {

output.writeUTF("SERVER>\n\t " + qout(input1, input2));

} else {

output.writeUTF("SERVER>\n\t " + "invalid choice");

}

service = input.readInt();

input1 = input.readInt();

input2 = input.readInt();

} while (service != 0);

output.writeUTF("SERVER>\n\t " + "Thank you for connecting to " + server.getLocalSocketAddress());

server.close();

} catch (SocketTimeoutException s) {

System.out.println("Socket timed out");

break;

} catch (IOException e) {

e.printStackTrace();

break;

}

}

}

private String menu() {

return "\tMath Server\n***************************\nchoose a number for the coresponding service\nthen send response in this format\n\n\tservice: (int)\n\tinput1: (int)\n\tinput2: (int)\n\n 0. Quit\n 1. Print this help message\n 2. Addition\n 3. Subtraction\n 4. Multiplication\n 5. Division";

}

private int add(int a, int b) {

return a + b;

}

private int diff(int a, int b) {

return a - b;

}

private int mult(int a, int b) {

return a*b;

}

private double qout(int a, int b) {

return (double)a/b;

}

}