Contoh Socket UDP di Java

Class ClientDatagram
=========================================================================

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package udpdatagram;

/**
 *
 * @author MAHASISWA PU
 */
import java.net.*;
import java.io.*;
public class ClientDatagram {
    public static DatagramSocket d;
    public static DatagramPacket p;
    public static byte buffer[] = new byte [1024];
    public static BufferedReader dis;
    public static int clientport = 800, serverport = 900;
   
   
    public static void main(String args[]) throws IOException {
       
        d= new DatagramSocket (clientport);
        //BufferedReader dis = new BufferedReader (new InputStreamReader (System.in));
        dis = new BufferedReader (new InputStreamReader (System.in));
        p = new DatagramPacket (buffer,buffer.length);
        //System.out.println("Client sedang menunggu server mengirimkan data...");
        InetAddress i =  InetAddress.getByName("localhost");
       
        while (true)
        {
            //System.out.print("Masukkan pesan anda :");
            //System.out.print("Masukkan pesan anda :");
            //DatagramPacket p = new DatagramPacket (buffer,buffer.length);
            //d.receive(p);
            //System.out.print(p);
            System.out.print("Masukkan pesan anda :");
            String ps = new String (dis.readLine());
            //System.out.println("Server : "+ps+"\n");
            buffer = ps.getBytes();
            //System.out.println("Server : ");
            //System.out.println(ps);
            //System.out.println("\n");
           
            //String str = dis.readLine();
            if((ps==null || ps.equals ("end")))
            {
               d.send (new DatagramPacket(buffer,ps.length(),i,serverport));
               break;
            }
           
            //buffer =str.getBytes();
            d.send (new DatagramPacket(buffer,ps.length(),i,serverport));
            d.receive(p);
            String ps2 = new String(p.getData(),0,p.getLength());
            System.out.println("Pesan dari server : " +ps2+"\n");
        }
        
    }
   
}

========================================================================
Class ServerDatagram

/*
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 * and open the template in the editor.
 */
package udpdatagram;

/**
 *
 * @author MAHASISWA PU
 */
import java.net.*;
import java.io.*;
public class ServerDatagram {
    public static DatagramSocket ds;
    public static DatagramPacket p;
    public static BufferedReader dis;
    public static byte buffer[] = new byte [1024];
    public static int clientport = 800, serverport = 900;

    /**
     * @param args the command line arguments
     */
    //public static byte buffer[] = new byte [10];
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
       
        //byte buffer[] = new byte [100];
        ds = new DatagramSocket (serverport);
        p = new DatagramPacket (buffer,buffer.length);
        dis = new BufferedReader (new InputStreamReader (System.in));
        //BufferedReader dis = new BufferedReader (new InputStreamReader (System.in));
        InetAddress i =  InetAddress.getByName("localhost");
        System.out.println("Menuggu pesan dari client,...");
        while (true)
        {
       
            //byte buffer[] = new byte [65535];
            //InetAddress i =  InetAddress.getByName("localhost");
            // System.out.print("Masukkan pesan anda :");
            ds.receive(p);
            //String str = dis.readLine();
            String str = new String(p.getData(),0,p.getLength());
            if((str==null || str.equals ("end")))
            {
               break;
            }
            //buffer =str.getBytes();
     
            //ds.send (new DatagramPacket(buffer,str.length(),i,clientport));
            //DatagramPacket p = new DatagramPacket (buffer,buffer.length);
            //ds.receive(p);
            System.out.println("Pesan dari client : " +str+"\n");
            System.out.print("Masukkan pesan anda :");
            String ps = new String (dis.readLine());
            buffer =ps.getBytes();
            //System.out.print("Masukkan pesan anda :");
            ds.send(new DatagramPacket(buffer,ps.length(),i,clientport));
            //String ps = new String (p.getData(),0,p.getLength());
            //System.out.println("test");
            //System.out.println("Client : ");
            //System.out.println(ps);
            //System.out.println("\n");
           
           
           
            }
    }
}

Contoh FTP di Java

Class FTP Client

=========================================================================
import java.net.*;
import java.io.*;
import java.util.*;


class FTPClient
{
    public static void main(String args[]) throws Exception
    {
        Socket soc=new Socket("127.0.0.1",5217);
        transferfileClient t=new transferfileClient(soc);
        t.displayMenu();

    }
}
class transferfileClient
{
    Socket ClientSoc;

    DataInputStream din;
    DataOutputStream dout;
    BufferedReader br;
    transferfileClient(Socket soc)
    {
        try
        {
            ClientSoc=soc;
            din=new DataInputStream(ClientSoc.getInputStream());
            dout=new DataOutputStream(ClientSoc.getOutputStream());
            br=new BufferedReader(new InputStreamReader(System.in));
        }
        catch(Exception ex)
        {
        }
    }
    void SendFile() throws Exception
    {

        String filename;
        System.out.print("Enter File Name :");
        filename=br.readLine();

        File f=new File(filename);
        if(!f.exists())
        {
            System.out.println("File not Exists...");
            dout.writeUTF("File not found");
            return;
        }

        dout.writeUTF(filename);

        String msgFromServer=din.readUTF();
        if(msgFromServer.compareTo("File Already Exists")==0)
        {
            String Option;
            System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
            Option=br.readLine();
            if(Option=="Y")
            {
                dout.writeUTF("Y");
            }
            else
            {
                dout.writeUTF("N");
                return;
            }
        }

        System.out.println("Sending File ...");
        FileInputStream fin=new FileInputStream(f);
        int ch;
        do
        {
            ch=fin.read();
            dout.writeUTF(String.valueOf(ch));
        }
        while(ch!=-1);
        fin.close();
        System.out.println(din.readUTF());

    }

    void ReceiveFile() throws Exception
    {
        String fileName;
        System.out.print("Enter File Name :");
        fileName=br.readLine();
        dout.writeUTF(fileName);
        String msgFromServer=din.readUTF();

        if(msgFromServer.compareTo("File Not Found")==0)
        {
            System.out.println("File not found on Server ...");
            return;
        }
        else if(msgFromServer.compareTo("READY")==0)
        {
            System.out.println("Receiving File ...");
            File f=new File(fileName);
            if(f.exists())
            {
                String Option;
                System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
                Option=br.readLine();
                if(Option=="N")
                {
                    dout.flush();
                    return;
                }
            }
            FileOutputStream fout=new FileOutputStream(f);
            int ch;
            String temp;
            do
            {
                temp=din.readUTF();
                ch=Integer.parseInt(temp);
                if(ch!=-1)
                {
                    fout.write(ch);
                }
            }while(ch!=-1);
            fout.close();
            System.out.println(din.readUTF());

        }


    }

    public void displayMenu() throws Exception
    {
        while(true)
        {
            System.out.println("[ MENU ]");
            System.out.println("1. Send File");
            System.out.println("2. Receive File");
            System.out.println("3. Exit");
            System.out.print("\nEnter Choice :");
            int choice;
            choice=Integer.parseInt(br.readLine());
            if(choice==1)
            {
                dout.writeUTF("SEND");
                SendFile();
            }
            else if(choice==2)
            {
                dout.writeUTF("GET");
                ReceiveFile();
            }
            else
            {
                dout.writeUTF("DISCONNECT");
                System.exit(1);
            }
        }
    }
}

=========================================================================
Class FTP Server

package ftpserver;

import java.net.*;                                                      
import java.io.*;
import java.util.*;

public class FTPServer1
{
    public static void main(String args[]) throws Exception
    {
        ServerSocket soc=new ServerSocket(5217);
        System.out.println("FTP Server Started on Port Number 5217");
        while(true)
        {
            System.out.println("Waiting for Connection ...");
            transferfile t=new transferfile(soc.accept());

        }
    }
}

class transferfile1 extends Thread
{
    Socket ClientSoc;

    DataInputStream din;
    DataOutputStream dout;

    transferfile1(Socket soc)
    {
        try
        {
            ClientSoc=soc;
            din=new DataInputStream(ClientSoc.getInputStream());
            dout=new DataOutputStream(ClientSoc.getOutputStream());
            System.out.println("FTP Client Connected ...");
            start();

        }
        catch(Exception ex)
        {
        }
    }
    void SendFile() throws Exception
    {
        String filename=din.readUTF();
        File f=new File(filename);
        if(!f.exists())
        {
            dout.writeUTF("File Not Found");
            return;
        }
        else
        {
            dout.writeUTF("READY");
            FileInputStream fin=new FileInputStream(f);
            int ch;
            do
            {
                ch=fin.read();
                dout.writeUTF(String.valueOf(ch));
            }
            while(ch!=-1);
            fin.close();
            dout.writeUTF("File Receive Successfully");
        }
    }

    void ReceiveFile() throws Exception
    {
        String filename=din.readUTF();
        if(filename.compareTo("File not found")==0)
        {
            return;
        }
        File f=new File(filename);
        String option;

        if(f.exists())
        {
            dout.writeUTF("File Already Exists");
            option=din.readUTF();
        }
        else
        {
            dout.writeUTF("SendFile");
            option="Y";
        }

            if(option.compareTo("Y")==0)
            {
                FileOutputStream fout=new FileOutputStream(f);
                int ch;
                String temp;
                do
                {
                    temp=din.readUTF();
                    ch=Integer.parseInt(temp);
                    if(ch!=-1)
                    {
                        fout.write(ch);
                    }
                }while(ch!=-1);
                fout.close();
                dout.writeUTF("File Send Successfully");
            }
            else
            {
                return;
            }

    }


    public void run()
    {
        while(true)
        {
            try
            {
            System.out.println("Waiting for Command ...");
            String Command=din.readUTF();
            if(Command.compareTo("GET")==0)
            {
                System.out.println("\tGET Command Received ...");
                SendFile();
                continue;
            }
            else if(Command.compareTo("SEND")==0)
            {
                System.out.println("\tSEND Command Receiced ...");
                ReceiveFile();
                continue;
            }
            else if(Command.compareTo("DISCONNECT")==0)
            {
                System.out.println("\tDisconnect Command Received ...");
                System.exit(1);
            }
            }
            catch(Exception ex)
            {
            }
        }
    }
}

Contoh Socket TCP di Java

Class JavaSocketClient.
=========================================================================
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javasocketserver;

/**
 *
 * @author Hakim
 */
import java.io.*;
import java.net.*;
public class JavaSocketClient {
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 menggunakan remote port
    try {
        cl = new Socket("LocalHost", 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("Error io: " + e2);
    }
   
    //Menulis ke server
    do {
        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();
         while(true);
    } catch (IOException x ) {
        System.out.println("Error writing..." + x);
       
}





=========================================================================

Class JavaSocketServer



/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javasocketserver;

/**
 *
 * @author Hakim
 */
import java.io.*;
import java.net.*;
public class JavaSocketServer {
public final static int TESTPORT = 5000;
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        ServerSocket checkServer = null;
        String line;
        BufferedReader is = null ;
        DataOutputStream os = null;
        Socket clientSocket = null;
        try {
            checkServer = new ServerSocket(TESTPORT);
            System.out.println("Applikasi 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("Horas") == 0) {
                os.writeBytes("Horas 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();
           
        }
    }
}

Source Code untuk menampilkan HostName di java

import java.net.*;

public class TampilkanHostName {
    public static void main(String args[]) throws Exception {
        InetAddress host = null;
        host = InetAddress.getLocalHost();
        System.out.println("Nama komputer anda : " + host.getHostName());
    }
}

Source Code untuk melihat IPAddress di java

import java.net.*;

public class LihatIP {
   
    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();
    }
}

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