Ayres_Server_HW2

deliverables/src/MV3500Cohort2018JulySeptember/homework2/Ayres_Server.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package MV3500Cohort2018JulySeptember.homework2.Ayres;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author kjayr
+ */
+public class Ayres_Server {
+    
+	@SuppressWarnings("ConvertToTryWithResources")
+	public static void main(String[] args)
+	{
+		try {
+			// ServerSocket waits for a connection from a client. 
+			// Notice that it is outside the loop; ServerSocket
+			// needs to be made only once.
+                        //Good reminder
+
+			System.out.println("TcpServer has started..."); // it helps debugging to put this on console first. Keep.
+			ServerSocket serverSocket = new ServerSocket(2317);
+
+			// Server is up and waiting (i.e. "blocked" or paused)
+			// Loop, infinitely, waiting for client connections.
+			// Stop the program somewhere else.
+			while (true)
+			{
+				Socket clientConnection = serverSocket.accept(); // block until connected to a client
+				
+				// Set up the streams, Java style:
+				OutputStream os = clientConnection.getOutputStream();
+				PrintStream  ps = new PrintStream(os);
+                                
+                                //Message to client
+				ps.println("**Strong connection to Server** Client operating...");
+                                
+                                //________________________
+                                //Set up input streams/messages from client
+                                InputStream is = clientConnection.getInputStream();
+                                InputStreamReader isr = new InputStreamReader(is);
+                                BufferedReader br = new BufferedReader(isr);
+                                String serverMessage = br.readLine();
+                                System.out.println("==================================================");
+                                System.out.println("The message the client sent was " + serverMessage);                                
+                                //________________________
+
+				// Print some information locally about the Socket
+				// connection. This includes the port and IP numbers
+				// on both sides (the socket pair.)
+				InetAddress localAddress = clientConnection.getLocalAddress();
+				InetAddress remoteAddress = clientConnection.getInetAddress();
+
+				int localPort = clientConnection.getLocalPort();
+				int remotePort = clientConnection.getPort();
+
+				// My socket pair connection looks like this, to localhost:
+				// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
+				// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+				//
+				// Why is the first IP/port the same, while the second set has
+				// different ports?
+				System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
+						+ remoteAddress.toString() + ", " + remotePort + " ))");
+
+				// Notice the use of flush() and close(). Without
+				// the close() to Socket object may stay open for 
+				// a while after the client has stopped needing this
+				// connection. Close() explicitly ends the connection.
+				ps.flush();
+				clientConnection.close(); // like it or not, you're outta here!
+			}
+		} 
+		catch (IOException e) {
+			System.out.println("problem with networking");
+		}
+	}
+    
+}