SimpleFileServer in Java

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

public class ClientSide {
    public static void main(String[] args) throws Exception
    {
        System.out.println("Client");
        int port = 2500,
            choice; // port number and choice variable for
                    // taking user choice for downloading or
                    // uploading a file.....
        String ip
            = "localhost"; // Server IP address.....send or
                           // receive file from this
                           // IP.....IP is used for making
                           // connection.....

        while (true) {
            Socket clientSocket = new Socket(
                ip, port); // Socket object used for making
                           // a connection to the given IP
                           // and Port address.....
            Scanner sc = new Scanner(System.in);

            System.out.println(
                "Enter Your Choice - 1 For Sending File and 2 For Downloading File : ");

            choice = sc.nextInt(); // taking choice from
                                   // console.....
            sendReq(
                choice,
                clientSocket); // method is used for sending
                               // the request to the
                               // server.....check the
                               // sendFile and receiveFile
                               // methods also which are
                               // inside sendReq
        }
    }

    public static void sendReq(int choice,
                               Socket clientSocket)
        throws Exception
    {
        if (choice == 1) // choice 1 is for sending a file
                         // to server.....uploading....
        {
            sendFile(
                clientSocket); // sends a file to
                               // server....it takes
                               // fileName and fileContent
                               // from the console.....and
                               // sends it to server.....
        }
        else if (choice
                 == 2) // choice 2 is for receiving a file
                       // from server....downloading...
        {
            receiveFile(
                clientSocket); // receive a file from server
                               // and stores it into a given
                               // directory or a folder.....
        }
        else {
            System.out.println("Invalid Choice");
        }
    }

    // used for send the file..........
    public static void sendFile(Socket clientSocket)
    {

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter file Name : ");
        String name = sc.nextLine(); // asking for file name
                                     // from console.....
        System.out.println("Enter Content : ");
        String content
            = sc.nextLine(); // asking for content of the
                             // file....
        Data data = new Data(
            1, name,
            content); // Data class object is used for
                      // making the given data into
                      // serializable......read more about
                      // serializable on internet.....
        ObjectOutputStream
            outputStream; // Using an ObjectOutputStream,
                          // you can write both primitive
                          // data types and graphs of Java
                          // objects to an OutputStream.
        try {
            outputStream = new ObjectOutputStream(
                clientSocket.getOutputStream());
            outputStream.writeObject(
                data); // writeObject(Object obj) method
                       // writes the specified object to the
                       // ObjectOutputStream.....
            System.out.println("File Sent Successfully!!");
        }
        catch (IOException e) {
            // TODO Auto-generated catch block
            System.out.println("Something Went Wrong");
            e.printStackTrace();
        }
    }

    // used for receiving the file.......
    public static void receiveFile(Socket clientSocket)
        throws Exception
    {
        ObjectOutputStream outputStream
            = new ObjectOutputStream(
                clientSocket.getOutputStream());
        ObjectInputStream inputStream
            = new ObjectInputStream(
                clientSocket.getInputStream());
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter file Name : ");
        String name
            = sc.nextLine(); // asking for file name that
                             // user want to download....

        Data data = new Data(
            2, name,
            ""); // making data object with given info....
        // sending info
        outputStream.writeObject(data);

        // receiving file
        Data receivedData
            = (Data)inputStream
                  .readObject(); // getting data from input
                                 // stream in the form of
                                 // Data object.....

        // storing file to the given directory or folder
        // with the given file name......
        File fileToBeDownloaded = new File(
            "C:\\Users\\Manish Sharma\\Documents\\Java File Server\\Client Downloaded Files\\"
            + receivedData.fileName);
        FileOutputStream fileOutputStream
            = new FileOutputStream(fileToBeDownloaded);
        fileOutputStream.write(
            (receivedData.fileContent).getBytes());
    }
}

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

public class ServerSide {
    static int port = 2500; // port address....
    public static void main(String[] args) throws Exception
    {
        System.out.println("Server");
        ServerSocket serverSocketObj = new ServerSocket(
            port); // server serving at port =
                   // 2500......ServerSocket starts this
                   // program to port = 2500....
        while (true) // infinite loop so that server is
                     // always listening to requests.....
        {
            receivingRequest(
                serverSocketObj); // handling requests.....
        }
    }

    // handling requests....downloading and uploading....
    public static void
    receivingRequest(ServerSocket serverSocketObj)
        throws Exception
    {
        Socket serverSideSocket = serverSocketObj.accept();
        ObjectOutputStream outputStream
            = new ObjectOutputStream(
                serverSideSocket
                    .getOutputStream()); // output
                                         // stream....
        ObjectInputStream inputStream
            = new ObjectInputStream(
                serverSideSocket
                    .getInputStream()); // input stream....

        Data data = (Data)inputStream.readObject();
        if (data.choice == 1) {
            // Receive file
            receiveFile(
                data, inputStream); // receiving a file.....
        }
        else {
            sendFile(data,
                     outputStream); // sending a file....
        }
    }

    // receiving the file from client and store it.....
    public static void
    receiveFile(Data data, ObjectInputStream inputStream)
        throws Exception
    {
        String fileName
            = data.fileName; // getting file name....
        String fileContent
            = data.fileContent; // getting file content....

        File newFile = new File(
            "C:\\Users\\Manish Sharma\\Documents\\Java File Server\\Server Files\\"
            + fileName); // file object.....
        FileOutputStream fileOutputStream
            = new FileOutputStream(newFile);

        fileOutputStream.write(
            fileContent
                .getBytes()); // writing the file to the
                              // given directory or folder
                              // with the given name......
    }

    // sends the file to the client.....
    public static void
    sendFile(Data data, ObjectOutputStream outputStream)
        throws Exception
    {
        File file = new File(
            "C:\\Users\\Manish Sharma\\Documents\\Java File Server\\Server Files\\"
            + data.fileName); // getting the file from the
                              // server's directory or
                              // folder (from server
                              // storage)......
        if (file.exists()
            == true) // if given file name is exits in
                     // server storage....
        {
            byte[] fileContentInBytes = new byte[(
                int)(file.length())]; // creating an array
                                      // of bytes to storing
                                      // the file
                                      // content....
            FileInputStream fileInpStream
                = new FileInputStream(file);
            fileInpStream.read(
                fileContentInBytes); // reading the file
                                     // from input stream
                                     // (input stream
                                     // between File System
                                     // of server and this
                                     // program) and storing
                                     // it into byte
                                     // array....

            Data fileToSend = new Data(
                0, data.fileName,
                new String(
                    fileContentInBytes)); // creating Data
                                          // object which
                                          // contains info
                                          // about file
                                          // which have to
                                          // send....

            outputStream.writeObject(
                fileToSend); // sending object to client
        }
        else {
            System.out.println("File Not Exist");
        }
    }
}

import java.io.Serializable;

public class Data implements Serializable {
    private static final long serialVersionUID = 1L;
    public int choice; // choice variable
    public String fileName; // file name variable.....stores
                            // file name....
    public String
        fileContent; // file content variable.....stores
                     // file content....

    Data(int choice, String fileName,
         String fileContent) // constructor.....
    {
        this.choice = choice;
        this.fileName = fileName;
        this.fileContent = fileContent;
    }
}