Subversion Repositories programming

Rev

Rev 186 | Rev 188 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
186 ira 1 
/*******************************************************************************
2 
 * File: P1Server.java
3 
 * Author: Ira W. Snyder (devel@irasnyder.com)
4 
 * Class: CS380 - Computer Networking
5 
 *
6 
 * Assignment: Project #1
7 
 * Date Last Modified: 2006-01-18
8 
 *
9 
 * Purpose: Opens a listening TCP Socket on port 1337. It echoes back
10 
 *          every packet that it recieves.
11 
 *
12 
 ******************************************************************************/
13 
 
14 
import java.io.*;
15 
import java.net.*;
16 
 
17 
public class P1Server
18 
{
187 ira 19 
    public static final int portNumber = 1337;
186 ira 20 
 
187 ira 21 
    /**
22 
     * Method: main()
23 
     * Purpose: This method creates a listening socket on port 1337 and
24 
     * accepts the first connection made to it. It then echoes back anything
25 
     * sent to it, until it recieves a "QUIT", at which point it terminates.
26 
     */
186 ira 27 
    public static void main (String[] args) throws IOException
28 
    {
29 
        ServerSocket serverSocket = null;
30 
 
31 
        /* Try to open the port for listening */
32 
        try
33 
        {
34 
            serverSocket = new ServerSocket (portNumber);
35 
        }
36 
        catch (IOException e)
37 
        {
38 
            System.err.println ("Could not listen on port: " + portNumber);
39 
            System.exit(1);
40 
        }
41 
 
42 
        Socket clientSocket = null;
43 
 
44 
        /* Try to accept the first connection that comes in */
45 
        try
46 
        {
47 
            clientSocket = serverSocket.accept();
48 
        }
49 
        catch (IOException e)
50 
        {
51 
            System.err.println ("Accept failed.");
52 
            System.exit(1);
53 
        }
54 
 
55 
        /* Set up input and output streams */
56 
        PrintWriter out = new PrintWriter (clientSocket.getOutputStream(), true);
57 
        BufferedReader in = new BufferedReader(
58 
                                new InputStreamReader(
59 
                                    clientSocket.getInputStream()));
60 
 
61 
        /* Use Strings to hold the input and output */
62 
        String inputLine, outputLine;
63 
 
64 
        /* Read input and echo back to output */
65 
        while ((inputLine = in.readLine()) != null)
66 
        {
67 
            /* If we recieve a message to quit, do so. */
68 
            if (inputLine.equals ("QUIT"))
69 
                break;
70 
 
71 
            /* Echo back what we recieved */
72 
            out.println (inputLine);
73 
        }
74 
 
75 
        /* Cleanup */
76 
        out.close();
77 
        in.close();
78 
        clientSocket.close();
79 
        serverSocket.close();
80 
    }
81 
}
82