TCP/IP UDP: Difference between revisions

TCP/IP UDP (view source)

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 * [[OSC]] - Open Sound Control
-== Sockets ==
+== APIs ==
+=== Sockets ===
 Protokolle wie TCP und UDP sind abstrakte Dienste, die die Struktur von Computer-Kommunikation definieren. Programmierer benutzen für TCP und UDP Operationen ''[http://de.wikipedia.org/wiki/Socket_(Software) Sockets]'', manchmal auch BSD-Sockets genannt. Sockets sind in jedem Betriebssystem zu finden.
-=== Socket-Beispiel JAVA ===
-Die [http://de.wikipedia.org/wiki/Java (Programmiersprache) Java] als plattformunabhängige [[Category:Programmiersprachen|Programmiersprache]] unterstützt im Paket <code>java.net</code> die Socket-Programmierung: Folgendes Kurzbeispiel zeigt die Verwendung der Klassen <code>Socket</code> und <code>ServerSocket</code>:
+'''Sockets in JAVA (Beispiel)'''
 <source lang="java">
 ServerSocket serverSocket = new ServerSocket(port);     // Serversocket mit bestimmter Port-Nummer erstellen
@@ Line 78: / Line 79: @@
 </source>
+<br/>
+=== PHP Socket ===
+<source lang="PHP">
+<?
+// code von
+// http://www.java2s.com/Code/Php/Network/CreatesaROT13serverwhenpeopleconnecttoitandsendtextitrespondswiththeROT13equivalentoftheirtext.htm
+$socket = socket_create_listen("12345");
+if (!$socket) {
+	print "Failed to create socket!\n";
+	exit;
+}
+while (true) {
+	$client = socket_accept($socket);
+	$welcome = "\nWelcome\n";
+	socket_write($client, $welcome);
+	while (true) {
+		$input = trim(socket_read ($client, 256));
+		if ($input = = '!close') { break; }
+		if ($input = = '!halt') {
+			socket_close ($client);
+			break 2;
+		}
+		$output = str_rot13($input) . "\n";
+		socket_write($client, $output);
+		print "Them: $input, Us: $output\n";
+	}
+	socket_close ($client);
+}
+socket_close ($socket);
+?>
+</source>
 weiterführende Links:
 * [http://de.wikipedia.org/wiki/Socket_(Software) BSD Sockets]
+* weitere Beispiele (z.B. für Processing) sind unter [[OSC]] zu finden!
+=== Datagram ===
+<br/>
+'''Datagram Socket (JAVA)'''
+<source lang="java">
+// code von
+// http://www.java2s.com/Code/Java/Network-Protocol/UseDatagramSockettosendoutandreceiveDatagramPacket.htm
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+public class ChatClient {
+  public static void main(String[] args) throws Exception {
+    DatagramSocket s = new DatagramSocket();
+    byte[] buf = new byte[1000];
+    DatagramPacket dp = new DatagramPacket(buf, buf.length);
+    InetAddress hostAddress = InetAddress.getByName("localhost");
+    while (true) {
+      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
+      String outMessage = stdin.readLine();
+      if (outMessage.equals("bye"))
+        break;
+      String outString = "Client say: " + outMessage;
+      buf = outString.getBytes();
+      DatagramPacket out = new DatagramPacket(buf, buf.length, hostAddress, 9999);
+      s.send(out);
+      s.receive(dp);
+      String rcvd = "rcvd from " + dp.getAddress() + ", " + dp.getPort() + ": "
+          + new String(dp.getData(), 0, dp.getLength());
+      System.out.println(rcvd);
+    }
+  }
+}
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+public class ChatServer {
+  public static void main(String[] args) throws Exception {
+    int PORT = 4000;
+    byte[] buf = new byte[1000];
+    DatagramPacket dgp = new DatagramPacket(buf, buf.length);
+    DatagramSocket sk;
+    sk = new DatagramSocket(PORT);
+    System.out.println("Server started");
+    while (true) {
+      sk.receive(dgp);
+      String rcvd = new String(dgp.getData(), 0, dgp.getLength()) + ", from address: "
+          + dgp.getAddress() + ", port: " + dgp.getPort();
+      System.out.println(rcvd);
+      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
+      String outMessage = stdin.readLine();
+      buf = ("Server say: " + outMessage).getBytes();
+      DatagramPacket out = new DatagramPacket(buf, buf.length, dgp.getAddress(), dgp.getPort());
+      sk.send(out);
+    }
+  }
+}
+</source>
 == Links ==
 siehe "weiterführende Links" unter den einzelnen Sektionen und:
+* [http://www.uni-weimar.de/cms/medien/webis/teaching/lecture-notes.html#web-technology Web-Technologie Vorlesung] bei Prof. Benno Stein
 * [http://www.uni-weimar.de/medien/webis/teaching/lecturenotes/web-technology/unit-de-network-protocol1.pdf Lecture Notes Network Protocols 1] von Prof. Benno Stein
 * [http://www.uni-weimar.de/medien/webis/teaching/lecturenotes/web-technology/unit-de-network-protocol1.pdf Lecture Notes Network Protocols 2] von Prof. Benno Stein
+[[Category:Programmiersprachen]]
 [[Category:Internet]]
 [[Category:Netztechnik]]