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DEMO D1-1

Program 1 : D1-1
Mengambil IP Komputer Lokal
Nama Program : getIP.java

Listing Program :

package tugaspakachsan;

import java.net.*;

public class getIP {

public static void main(String args[]) throws Exception {

InetAddress host = null;

host = InetAddress.getLocalHost();

byte ip[] = host.getAddress();

for(int i=0; i<ip.length; i++) {

if (i > 0) {

System.out.print(“.”);

}

System.out.print(ip[i] & 0xff);

}

System.out.println();

}

}

DEMO D1-2
Program 2 : D1-2
Mencetak Nama Komputer Lokal
Nama Program : getName.java
Listing Program :
package tugaspakachsan;
import java.net.*;
public class getName {
    public static void main(String args[]) throws Exception {
    InetAddress host = null;
    host = InetAddress.getLocalHost();
    System.out.println(“Nama komputer anda: ” + host.getHostName());
    }

}

DEMO D1-3
Program 3 : D1-3
Mengambil IP dengan Nama Komputer Lokal
Nama Program : IPtoName.java

Listing Program :
import java.net.*;
public class IPtoName {
public static void main(String args[]) {
if (args.length == 0) {
System.out.println(“Pemakaian: java IPtoName “);
System.exit(0);
}
String host = args[0];
InetAddress address = null;
try {
address = InetAddress.getByName(host);
} catch (UnknownHostException e) {
System.out.println(“invalid IP – malformed IP”);
System.exit(0);
}
System.out.println(address.getHostName());
}
}

DEMO D1-4
Program 4 : D1-4
Nama Program : NsLookup.java

Listing Program :

import java.net.*;
public class NsLookup {
public static void main(String args[]) {
if (args.length == 0) {
System.out.println(“Pemakaian: java NsLookup “);
System.exit(0);
}
String host = args[0];
InetAddress address = null;
try {
address = InetAddress.getByName(host);
} catch(UnknownHostException e) {
System.out.println(“Unknown host”);
System.exit(0);
}
byte[] ip = address.getAddress();
for (int i=0; i
if (i > 0) System.out.print(“.”);
System.out.print((ip[i]) & 0xff);
}
System.out.println();
}
}

DEMO D1-5.1
Program 5 : D1-5.1
Nama Program : SimpleClient.java

Listing Program :
import java.io.*;
import java.net.*;
public class simpleClient {
public final static int REMOTE_PORT = 5000;
public static void main(String args[]) throws Exception {
Socket cl = null;
BufferedReader is = null;
DataOutputStream os = null;
BufferedReader stdin = new BufferedReader(new
InputStreamReader(System.in));
String userInput = null;
String output = null;
// Membuka koneksi ke server pada port REMOTE_PORT
try {
cl = new Socket(args[0], REMOTE_PORT);
is = new BufferedReader(new
InputStreamReader(cl.getInputStream()));
os = new DataOutputStream(cl.getOutputStream());
} catch(UnknownHostException e1) {
System.out.println(“Unknown Host: ” + e1);
} catch (IOException e2) {
System.out.println(“Erorr io: ” + e2);
}
// Menulis ke server
try {
System.out.print(“Masukkan kata kunci: “);
userInput = stdin.readLine();
os.writeBytes(userInput + “\n”);
} catch (IOException ex) {
System.out.println(“Error writing to server…” + ex);
}
// Menerima tanggapan dari server
try {
output = is.readLine();
System.out.println(“Dari server: ” + output);
} catch (IOException e) {
e.printStackTrace();
}
// close input stream, output stream dan koneksi
try {
is.close();
os.close();
cl.close();
} catch (IOException x) {
System.out.println(“Error writing….” + x);
}
}
}

DEMO D1-5.2
Program 5 : D1-5.2
Nama Program : SimpleServer.java

Listing Program :

 import java.io.*;
import java.net.*;
public class simpleServer {
public final static int TESTPORT = 5000;
public static void main(String args[]) {
ServerSocket checkServer = null;
String line;
BufferedReader is = null;
DataOutputStream os = null;
Socket clientSocket = null;
try {
checkServer = new ServerSocket(TESTPORT);
System.out.println(“Aplikasi Server hidup …”);
} catch (IOException e) {
System.out.println(e);
}
try {
clientSocket = checkServer.accept();
is = new BufferedReader(new
InputStreamReader(clientSocket.getInputStream()));
os = new DataOutputStream(clientSocket.getOutputStream());
} catch (Exception ei) {
ei.printStackTrace();
}
try {
line = is.readLine();
System.out.println(“Terima : ” + line);
if (line.compareTo(“salam”) == 0) {
os.writeBytes(“salam juga”);
} else {
os.writeBytes(“Maaf, saya tidak mengerti”);
}
} catch (IOException e) {
System.out.println(e);
}
try {
os.close();
is.close();
clientSocket.close();
} catch (IOException ic) {
ic.printStackTrace();
}
}
}

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