Mobile Programming - Network Universitas Budi Luhur

JAVA NETWORKING
Mobile Programming

ILLUSTRATION
IP: 192.168.1.1
IP: 192.168.1.2 IP: 192.168.1.3 IP: 192.168.1.4 IP: 192.168.1.5 IP: 192.168.1.6

DETAILED ILLUSTRATION
Logical Path
Physical Layer
Internet Layer (IP) Internet Layer (IP)
Transport Layer (TCP/IP) Transport Layer (TCP/IP)
Application Layer Application Layer

TERMINOLOGY
• Transmission Control Protocol
• User Datagram Protocol
• Port
• URL
• HTTP

MORETERMINOLOGY
• HTML
• XML
• FTP
• SMTP
• POP3/IMAP

1 import java.net.*;
2
3 public class ProtocolTester {
4 public static void main(String[] args) {
5 String url = "www.bl.ac.id";
6
7 testProtocol("http://" + url);
8 testProtocol("https://" + url);
9 testProtocol("ftp://" + url);
10 testProtocol("nfs://" + url);
11 testProtocol("telnet://" + url);
12 testProtocol("mailto:rizafahmi@gmail.com");
13
14
15 }
16
17 private static void testProtocol (String url) {
18 try {
19 URL u = new URL(url);
20 System.out.println(u.getProtocol() + " is supported.");
21 } catch (MalformedURLException e) {
22 String protocol = url.substring(0, url.indexOf(":"));
23 System.out.println(protocol + " is not supported");
24 }
25 }
26 }

2 import java.io.*;
3
4 public class LowPortScanner {
5 public static void main(String[] args) {
6 String host = "www.bl.ac.id";
7 System.out.println("Tunggu ya, sedang
mendeteksi...");
8
9 for (int i = 1; i < 100; i++) {
10 try {
11 Socket s = new Socket(host, i);
12 System.out.println("Port " + i + " digunakan
" + host);
13 } catch (UnknownHostException e) {
14 System.err.println(e);
15 } catch (IOException e) {
16 System.out.println("Port " + i + " Tidak
Digunakan " + host);
17 }
18 }
19 }
20 }

2 import java.io.*;
3 public class SourceViewer {
4
5 public static void main (String[] args) {
6 if (args.length > 0) {
7 InputStream in = null;
8 try {
9 URL u = new URL(args[0]);
10 in = u.openStream();
11
12 in = new BufferedInputStream(in);
13 Reader r = new InputStreamReader(in);
14 int c;
15 while((c = r.read()) != -1) {
16 System.out.print((char) c);
17 }

18 } catch (MalformedURLException e) {
19 System.out.print(args[0] + " is not
parseable URL");
21 System.err.println(e);
22 } finally {
23 if (in != null) {
24 try {
25 in.close();
27 // ignore
28 }
29 }
30 }
31
32 }
33 }
34 }

> java SourceViewer http://www.bl.ac.id/
<!DOCTYPE html>
<html lang="id-ID">
<head>
<meta charset="UTF-8" />
<title>Universitas Budi Luhur</title>
<link rel="profile" href="http://gmpg.org/xfn/11" />
<link rel="pingback" href="http://www.budiluhur.ac.id/xmlrpc.php" />
<script type="text/javascript" src="http://www.budiluhur.ac.id/wp-
content/themes/new-bl/images/jquery.js"></script>
<link rel="EditURI" type="application/rsd+xml" title="RSD" href="http://
www.
budiluhur.ac.id/xmlrpc.php?rsd">
<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="http://
www.
budiluhur.ac.id/wp-includes/wlwmanifest.xml">
<link rel="index" title="Universitas Budi Luhur" href="http://
www.budiluhur.ac.
id/">
<meta name="generator" content="WordPress 3.0.1">
…

1 import java.util.*;
2 import javax.mail.*;
3 import javax.mail.internet.*;
4 import javax.activation.*;
5
6 public class SendEmail {
7 public static void main (String[] args) {
8 String to = "rizafahmi@gmail.com";
9 String from = “riza@appsco.id";
10 String host = "192.168.1.134";
11 Properties properties = System.getProperties();
12 properties.setProperty("mail.smtp.host", host);
13 properties.put("mail.smtp.port", 1025);
14 Session session = Session.getDefaultInstance(properties);
15

16 try {
17 MimeMessage message = new MimeMessage(session);
18 message.setFrom(new InternetAddress(from));
19 message.addRecipient(Message.RecipientType.TO, new
InternetAddress(to));
20 message.setSubject("This is the subject line");
21 message.setText("This is actual message");
22
23 Transport.send(message);
24 System.out.println("Sent message successfully...");
25 } catch (MessagingException e) {
26 e.printStackTrace();
27 }
28 }
29 }
30

1 import java.util.Properties;
2 import javax.mail.*;
3 import javax.mail.internet.*;
4
5 public class POP3Client {
6 public static void main(String[] args) throws Exception {
7
8 Properties properties = getProperties();
9
10 Session session = getSession(properties);
11
12 Store store = connectingStore(session);
13
14 Folder inbox = getInboxFolder(store, "Inbox");
15
16 Message[] messages = inbox.getMessages();
17
18 if (messages.length == 0)
19 System.out.println("No message found");
20
21 System.out.println(messages.length);
22
23 inbox.close(true);
24 store.close();
25 }
26

27 private static Properties getProperties() {
28
29 Properties properties = System.getProperties();
30 properties.put("mail.pop3.port", 995);
31 properties.put("mail.pop3.ssl.enable", true);
32 properties.setProperty("mail.pop3.ssl.trust", "*");
33
34 return properties;
35 }
36
37 private static Session getSession(Properties properties) {
38 Session session = Session.getDefaultInstance(properties);
39
40 return session;
41 }
42

43 private static Store connectingStore(Session session) throws
Exception {
44 String host = "pop.zoho.com";
45 String username = "riza@appsco.id";
46 String password = "123456";
47
48 Store store = session.getStore("pop3");
49 store.connect(host, 995, username, password);
50
51 return store;
52 }
53
54 private static Folder getInboxFolder(Store store, String
folder) throws
55 Exception {
56 Folder inbox = store.getFolder("Inbox");
57 inbox.open(Folder.READ_ONLY);
58
59 return inbox;
60 }
61 }

Mobile Programming - Network Universitas Budi Luhur

2 import java.io.*;
3
4 public class KnockKnockProtocol {
5 private static final int WAITING = 0;
6 private static final int SENTKNOCKKNOCK = 1;
7 private static final int SENTCLUE = 2;
8 private static final int ANOTHER = 3;
9 private static final int NUMJOKES = 5;
10
11 private int state = WAITING;
12 private int currentJoke = 0;
13 private String[] clues = {"Bessarion", "Colby", "Gary", "Teodor", "Kamala"};
14 private String[] answers = {"Matiin AC dong, dingin nih!", "Lagi pusing
15 ya?", "Kelihatan ngga?", "Semoga sukses",
16 "Bazinga!"};
17

18 public String processInput(String inputString) {
19 String outputString = null;
20
21 if (state == WAITING) {
22 outputString = "Tok, tok, tok";
23 state = SENTKNOCKKNOCK;
24 } else if (state == SENTKNOCKKNOCK) {
25 if (inputString.equalsIgnoreCase("Siapa?")) {
26 outputString = clues[currentJoke];
27 state = SENTCLUE;
28 } else {
29 outputString = "Seharusnya kamu menjawab "Siapa?"! " + "Yuk kita
30 coba lagi. Tok, tok, tok";
31 state = ANOTHER;
32 }
33 } else if (state == SENTCLUE) {
34 if (inputString.equalsIgnoreCase(clues[currentJoke] + " siapa?")) {
35 outputString = answers[currentJoke] + " Ingin orang lain? (y/n)";
36 state = ANOTHER;
37 } else {
38 outputString = "Seharusnya "" + clues[currentJoke] + " siapa?"" +
39 "! Coba lagi yaa. Tok, tok, tok";
41 }

42 } else if (state == ANOTHER) {
43 if (inputString.equalsIgnoreCase("y")) {
44 outputString = "Tok, tok, tok";
45 if (currentJoke == (NUMJOKES - 1))
46 currentJoke = 0;
47 else
48 currentJoke++;
50 } else {
51 outputString = "Bye bye!";
52 state = WAITING;
53 }
54
55 }
56
57 return outputString;
58 }
59 }

2 import java.io.*;
3
4 public class KnockKnockServer {
5 public static void main(String[] args) throws IOException {
6 ServerSocket serverSocket = null;
7
8 try {
9 serverSocket = new ServerSocket(4444);
10 System.out.println("Ok, server ready!");
12 System.err.println("port 4444 tidak dapat digunakan.");
13 System.exit(1);
14 }
15
16 Socket clientSocket = null;
17 try {
18 clientSocket = serverSocket.accept();
20 System.err.println("Client gagal menggunakan port.");
21 System.exit(1);
22 }
23

24 PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
25
26 BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.
27 getInputStream()));
28
29 String inputLine, outputLine;
30
31 KnockKnockProtocol kkp = new KnockKnockProtocol();
32 outputLine = kkp.processInput(null);
33 out.println(outputLine);
34
35 while((inputLine = in.readLine()) != null) {
36 outputLine = kkp.processInput(inputLine);
37 out.println(outputLine);
38
39 if (outputLine.equals("Bye bye!"))
40 break;
41 }
42
43 out.close();
44 in.close();
45 clientSocket.close();
46 serverSocket.close();
47 }
48 }

1 import java.io.*;
3
4 public class KnockKnockClient {
5 public static void main(String[] args) throws IOException {
6 Socket kkSocket = null;
7 PrintWriter out = null;
8 BufferedReader in = null;
9
10 try {
11 kkSocket = new Socket("localhost", 4444);
12 out = new PrintWriter(kkSocket.getOutputStream(), true);
13 in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream())
14 );
15
16 } catch (UnknownHostException e) {
17 System.err.println("Host localhost tidak ditemukan.");
18 System.exit(1);
20 System.err.println("Koneksi Input output ke localhost gagal.");
21 System.exit(1);
22 }
23

24 BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)
25 );
26 String fromServer;
27 String fromUser;
28
29 while((fromServer = in.readLine()) != null) {
30 System.out.println("Server: " + fromServer);
31 if (fromServer.equals("Bye bye!"))
32 break;
33
34 fromUser = stdIn.readLine();
35
36 if (fromUser != null) {
37 System.out.println("Client: " + fromUser);
38 out.println(fromUser);
39 }
40 }
41
42 out.close();
43 in.close();
44 stdIn.close();
45 kkSocket.close();
46 }
47 }

Mobile Programming - Network Universitas Budi Luhur

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